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Research progress on 3D printing technology of continuous fiber reinforced composites based on FDM GUAN Bowen, ZHANG Daijun, WANG Chengbo, YANG Fanghong, YE Lu, CHEN Xiangbao COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 145-152.   DOI: 10.19936/j.cnki.2096-8000.20251128.018 Abstract （323）      PDF （4592KB）（631）       Knowledge map    Save Continuous fiber reinforced composites (CFRCs) are widely recognized in fields like aerospace, automotive manufacturing, and microelectronics due to their advantages of lightweight, high strength, and high design freedom. 3D printing technology is regarded as an effective approach for achieving rapid, customized, and integrated manufacturing of CFRCs with complex structures. This paper, based on the fused deposition modeling process, introduces the factors affecting the performance of CFRC 3D-printed parts, including printing equipment, raw materials, and printing processes. It also summarizes the research progress of CFRCs in structural-functional design and multiscale performance analysis, as well as their current applications in various fields. Furthermore, it analyzes the current challenges in CFRCs research and discusses prospects for future development. Reference | Related Articles | Metrics

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Product performance analysis and process parameter optimization of needle-punched C/C composite material YANG Guoyong, LIU Zhenyu, ZHANG Nan, KONG Haoqiang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 79-85.   DOI: 10.19936/j.cnki.2096-8000.20251128.010 Abstract （217）      PDF （8324KB）（540）       Knowledge map    Save This research focuses on exploring the relationship between process parameters and the performance of carbon/carbon composite materials during the needle-punched process, employing a central composite design method to plan the experimental scheme. Using the response surface method to analyze the experimental data, a quadratic response model was established that correlates the bending strength of the product with needle-punched process parameters, including needling depth, needling density, and carbon fiber surface density. Based on this model, the process parameters were optimized and an analysis was conducted on the influence patterns of individual process parameters and their combined effects on the bending strength. The research findings indicate that the best parameters were a needling depth of 12 mm, a needling density of 17.81 needles/cm 2, and a carbon fiber surface density of 400 g/m 2. The study also reveals that the carbon fiber surface density had the most significant impact on bending strength, followed by the needling depth, while the effect of needling density is relatively minor. Furthermore, the study uncovers that the coupling effects between needling depth and carbon fiber surface density, as well as between needling depth and needling density, significantly influenced the bending strength. Through delving into the interactive effects of the process parameters, it is determined that the bending performance of the product is optimal when the needling depth is between 12~16 mm, the needling density is between 15~25 needles/cm 2, and the carbon fiber surface density is between 380~400 g/m 2, with the strength exceeding 100 MPa. These findings expand the needle punching forming process window for carbon/carbon composite materials, which helps to improve their forming efficiency and product quality. Reference | Related Articles | Metrics

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Comparative study on digital tap detection of aramid paper honeycomb sandwich structure HAO Wei, LI Ming, LI Yao, SUN Jiefu, WANG Huidong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 64-69.   DOI: 10.19936/j.cnki.2096-8000.20251128.008 Abstract （143）      PDF （5483KB）（504）       Knowledge map    Save Many kinds of defects can be produced in the manufacturing, assembly and service stage of composite aramid paper honeycomb sandwich structure. The ability to identify defects can be affected by part status, material properties, defect types and non-destructive testing methods. According to the requirement of nondestructive testing for composite honeycomb sandwich structure, glass fiber skin honeycomb structure and carbon fiber skin honeycomb structure were tested by digital tap detection. On the basis of the traditional detection of shallow area defects (such as debonding, delamination, inclusion, weak adhesion), the deep buried volume defects (such as core material fracture and collapse) were also detected. The effects of skin type, defect type and defect topography on the contact time were discussed. The advantages and limitations of digital tap detection, ultrasonic pulse echo detection, through-transmission ultrasonic detection and X-ray digital radiography method were analyzed. The experiment proves that the digital tap detection technology can effectively detect the delamination, debonding, core material fracture and collapse defects in composite honeycomb sandwich structure, especial produced after curing. Reference | Related Articles | Metrics

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Study on the influence of process parameters on fiber reorientation of woven composite during thermoforming CHEN Pan, ZHONG Yucheng COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 86-94.   DOI: 10.19936/j.cnki.2096-8000.20251128.011 Abstract （139）      PDF （11595KB）（488）       Knowledge map    Save The formation process of composite materials alters the internal structure, which subsequently impacts the properties of the composite component. This is especially evident when the geometry of the part is complex; the forming of the woven composite may result in alterations in the warp and weft angles. To investigate the fiber reorientation induced by forming processes and to identify the influencing factors, a finite element model (FEM) employing a hypoelastic constitutive law was developed. This model was validated through hemispherical forming experiments, focusing on two primary aspects: fiber reorientation distribution and the boundary profile of the prepreg. Moreover, the paper extends the validation to U-shaped structures, where forming experiments and simulations are conducted to further substantiate the model’s predictive capability regarding fiber reorientation. Additionally, the impact of various factors such as the coefficient of friction, blank holding force (BHF), and blank holding area (BHA) on fiber reorientation is extensively analyzed through the forming simulations of the U-shaped structure. The results show that these process parameters are important factors affecting fiber reorientation and should be optimized during thermoforming. Reference | Related Articles | Metrics

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Research on adaptive regularization damage identification (ARDI) method for composite laminate structure YANG Ying, SHI Qinghe, HU Kejun, ZHU Fuxian, DUAN Liuyang, ZHAO Fengling COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 1-9.   DOI: 10.19936/j.cnki.2096-8000.20260228.001 Abstract （215）      PDF （7885KB）（474）       Knowledge map    Save Composite laminate structures are widely used, and damage identification is of great significance to ensure the safety of structures and prolong their service life. In this paper, the element-level damage indicator is introduced to describe the change of the in-plane and out-plane upward stiffness of laminates. Aiming at the damage index, a two-step damage identification method was established, that is, the damage element was screened by the damage location index, and then the damage degree was identified by the optimization method. The regularization method was used for quantitative damage recognition. Since the traditional regularization method adopts uniform regularization parameters for each damage parameter, which is not conducive to the convergence and stability of the identification results. In this paper, an adaptive regularization damage identification (ARDI) method based on weighting coefficient is proposed, which can improve the identification efficiency while considering the stability of identification results. The effectiveness of the proposed method is verified by numerical examples, and the influence of the number of measurement points and noise level on recognition results is analyzed. The results of the proposed method are compared with the direct method and the traditional regularization method, and it is found that the dispersion of calculation results and the efficiency of the proposed method have obvious advantages. Finally, an experimental work was conducted to verify the effectiveness of the proposed method. Reference | Related Articles | Metrics

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Effect of adhesive layer defect and ambient temperature on mechanical properties of CFRP-steel single lap bonded joints WANG Jianzhe, WANG Boli, CAO Qiongfang, YU Sai, GENG Furong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 55-63.   DOI: 10.19936/j.cnki.2096-8000.20251128.007 Abstract （134）      PDF （10654KB）（451）       Knowledge map    Save In order to study the failure characteristics of dissimilar materials under different damage defects and temperature environment and promote the application of bonding in vehicle engineering, this paper takes carbon fiber reinforced plastics-steel single lap joint as the research object and carries out experimental research on static tensile mechanical properties. In this study, the common damage defects in engineering and the ambient temperature were taken as variables. Firstly, the static tensile test was carried out on the single lap joint without defects at normal temperature to analyze the mechanical properties and failure modes of the joint. Then, five kinds of joints with different crack locations and lengths were tested to study the effects of different adhesive layer defects on the mechanical properties of CFRP-steel bonded joints. Finally, the study was extended to different ambient temperatures. The research results show that the joints without defects at room temperature mainly fail in cohesiveness, and the defects lead to interface failure. The temperature test results show that the ambient temperature not only affects the mechanical properties of adhesive materials, but also affects the properties of the bonding interface between metal and composite substrate. The synergistic effects of various factors lead to changes in structural strength and failure mode. This study provides the design basis and guidance method for the adhesive connection of composite carbon fiber materials and steel in engineering. Reference | Related Articles | Metrics

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Optimization design of test tooling for composite sleeper based on multi-objective genetic algorithm XU Chen, ZHANG Qingkai, QIN Junfei, HUANG Cheng COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 131-136.   DOI: 10.19936/j.cnki.2096-8000.20251128.016 Abstract （191）      PDF （6159KB）（446）       Knowledge map    Save A composite sleeper’s design load is 1 000 kN, it must meet deformation requirements of sleeper’s bending load. So the test tooling must be designed to meet the requirements of bending load. This paper established the response surface of target parameters to section sizes based on the theory of material mechanics and Kirging model. Based on this, the tooling was obtained by multi-objective genetic algorithm, and finally, was obtained the optimal combination of tooling’s section size. Then bending resistance of the tooling was calculated according to optimized section sizes by FEM. Thereafter, the tooling was manufactured based on the optimized section sizes. The result show that this tooling did not create any plastic deformation with a 1 000 kN load. Reference | Related Articles | Metrics

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Tensile mechanical test and numerical simulation of pin-anchored CFRP laminated strap cable LEI Jiayan, ZHAO Daohua, KONG Qinghui, ZHANG Longbin, ZHANG Qirui COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 103-109.   DOI: 10.19936/j.cnki.2096-8000.20251128.013 Abstract （183）      PDF （9294KB）（445）       Knowledge map    Save The pin-anchored carbon fiber reinforced polymers (CFRP) cable member has promising application in structure engineering for its simple structural construction. However, the effective anchorage of cable end would interrupt its full tensile capacity for premature failure in anchorage zone. In this work, tensile mechanical test was conducted with seven pin-anchored CFRP laminated loop straps to investigate the failure mechanism, ultimate tensile capacity and nonuniform stress in pin-anchored zone with the help of the digital image correlation (DIC) technology. The test results show that the fixture is crucial to the development of the tensile properties and failure mode of the strap cables. One no-fixture specimen was subjected to laminar tear; and the rest six strap cables showed nonlinear development in the load-displacement curves during tensile loading process, in which the microdamage of matrix and the adhesion failure of matrix and fiber interface accumulated continuously. Analysis explained the mechanism that the wedge angle θ and transverse binding force provided by the fixture were crucial in two structural failure modes of the cables. Finally, finite element analysis was carried out with quasi-static tensile simulation technique in ABAQUS to monitor the non-uniform stress in lamination layers up to the premature failure in anchor zone. Reference | Related Articles | Metrics

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Research progress on fiber reinforced polydicyclopentadiene composites XIAO Jian, LI Pengfei, FU Hongwei, JIA Zhiyuan, CHEN Yong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 137-144.   DOI: 10.19936/j.cnki.2096-8000.20251128.017 Abstract （187）      PDF （5049KB）（438）       Knowledge map    Save Polydicyclopentadiene (PDCPD) is a kind of thermosetting polymeric material with excellent mechanical properties, low density and easy processing, which can replace some steel plate, castings and glass steel parts for agricultural vehicles, engineering vehicles, heavy trucks and other applications. Fiber reinforced PDCPD composites can show stronger mechanical properties and may extend to wider application including but not limited to various vehicle parts, rail transit, wind power, photovoltaic parts, hydrogen storage, etc. However, the polarity of PDCPD itself is low, and the interfacial bonding between commercial fabrics and PDCPD is poor, which limits the application of fiber reinforced PDCPD composites. The research progress of fiber-reinforced PDCPD materials in recent years was reviewed. The approaches to improve the interfacial bonding property of the carbon and glass fiber reinforced PDCPD materials were discussed. And future modifications of the fiber-reinforced PDCPD composites were prospected. Reference | Related Articles | Metrics

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Transverse compressive mechanical tests of CFRP tendons at elevated temperature WANG Lichen, LIU Yuanyuan COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 49-57.   DOI: 10.19936/j.cnki.2096-8000.20260228.007 Abstract （137）      PDF （19656KB）（437）       Knowledge map    Save To improve the high temperature resistance of joints in cable roof structures made of carbon fiber reinforced polymer (CFRP), the CFRP tendon wedge-type anchorage system was studied. Firstly, the glass transition temperature test of CFRP tendons was carried out to obtain the starting and ending temperatures of the glass transition of CFRP tendons (126 ℃, 192 ℃). Based on this, the target test temperature for the transverse compressive mechanical test at elevated temperature was further worked out. Then, the same two aluminum plates with semicircular grooving were made of A6061-T6 aluminum alloy to simulate the wedge in the anchoring system. By conducting experiments, the transverse compressive mechanical properties and deformation characteristics of CFRP tendons with the influence of aluminum plate are obtained under high temperature. The results can provide data support for the construction of the constitutive model of CFRP tendons under high temperature. By establishing the finite element model corresponding to the test, the average error between the calculated strain value and the strain value obtained by the test is less than 5%, the validity of thermal and mechanical parameters in the finite element model is demonstrated, and the anchorage system model can be further constructed for high-temperature analysis. Reference | Related Articles | Metrics

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Application of polyborosiloxane shear-shickening gel in bulletproof and explosion-proof fields SU Jiakai, JIANG Bo, LIU Meina, RONG Zhizong, CAO Yiru, ZHAO Lili COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (10): 68-72.   DOI: 10.19936/j.cnki.2096-8000.20251028.010 Abstract （223）      PDF （971KB）（423）       Knowledge map    Save Polyborosiloxane shear-thickening gel (PBS-STG) is an intelligent material that combines shear-thickening properties with high stability. Its unique dynamic cross-linked network structure enables rapid hardening under high-speed impact, effectively absorbing energy and dispersing impact forces, while maintaining softness and lightweight characteristics under static conditions. This article systematically analyzes the molecular structure and properties of polyborosiloxane, as well as the principle of bulletproof and explosion-proof effects, and focuses on exploring its application status in the fields of bulletproof vests, bulletproof armor, explosion-proof glass, explosion-proof clothing, explosion-proof containers, and shields. By integrating the latest research advances, this study also summarizes existing technical bottlenecks and future development directions, providing insights for the design of high-performance protective materials. Reference | Related Articles | Metrics

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A novel approach for impact load identification on composite material structures using truncated vibration response ZHANG Li, YANG Xiaoming, JIANG Quanxin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 1-7.   DOI: 10.19936/j.cnki.2096-8000.20251128.001 Abstract （183）      PDF （8749KB）（421）       Knowledge map    Save Identification of impact load on composite material structures is the second-category inverse problem in structural dynamics, prone to significant deviations due to the influence of measurement noise and modeling errors. To address this issue, this paper proposes a novel method for the precise identification of impact load based on truncated vibration responses. Firstly, the complete vibration response is decomposed into multi-scale intrinsic mode functions using variational mode decomposition (VMD), thereby eliminating high-frequency modes and measurement noise to obtain a truncated vibration response that contains only the low-order principal frequency components of the structure. Subsequently, the truncated singular value based least squares method is employed to extract the truncated modal constant vector of the impact location from the truncated vibration response to realize impact localization. Finally, based on the localization results, the collinearity factor of the modal constant vector is estimated, thus completing the inversion of the impact intensity. Experiments on a real wing show that the proposed method can achieve a localization success rate of up to 86.67% by using the truncated vibration response composed of the first three modal acceleration responses of the wing with merely a single accelerometer, and the average peak relative error index of force reconstruction is only 6.51%. Reference | Related Articles | Metrics

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Study on compression failure mechanism and energy absorption characteristics of composite wound tube SU Hailiang, WEI Tengteng, HUANG Weilong, WEI Zhenxiao, ZHOU Mengfan COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 28-33.   DOI: 10.19936/j.cnki.2096-8000.20260228.004 Abstract （156）      PDF （10686KB）（415）       Knowledge map    Save Mechanical tests and simulation methods were utilized to study the failure behavior and attributes of [±45] 3S wrapped composite round pipes under various compression circumstances. Quasi-static axial and radial compression failure tests were performed on the composite wound cylindrical pipes, followed by an investigation of the wound round pipe’s energy absorption characteristics. LS-DYNA was used to create a finite element model of the Hashin and Chang-Chang failure criterion for simulation, and the failure reaction and energy absorption damage process of the circular tube were investigated. The efficiency of the established simulation model was thoroughly validated using comparative tests and numerical analysis. The results demonstrate that the wound tube mostly absorbs crushing energy via matrix fracture and fiber buckling. The Chang-Chang failure criterion simulates deformation more accurately, which is consistent with test results in which the initial peak value, total energy absorption, and specific energy absorption of axial and radial compression are all less than 10%. Reference | Related Articles | Metrics

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Simulation analysis of stitched foam sandwich composite by VARTM molding ZHANG Lianhe, QIN Cheng, CHENG Yanan, REN Hao, LI Yongfeng, ZHANG Hui COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 70-78.   DOI: 10.19936/j.cnki.2096-8000.20251128.009 Abstract （166）      PDF （17597KB）（406）       Knowledge map    Save In order to investigate the injection process of stitched foam sandwich composites, the permeability of foam sandwich fiber layer and core layer holes were measured based on Darcy’s law, and the equivalent model of foam sandwich was established. Composite materials were prepared by vacuum-assisted resin transfer molding (VARTM) process. The effects of stitch density and injection method on the permeability and filling process of stitched foam sandwich composites were systematically investigated. The results show that compared to the unstitched fabric, when stitched at a density of 8 mm×8 mm, the permeability of the fiber layer stitched fabric along the stitch direction increase by a maximum of 104.9%. When stitched at a density of 4 mm×4 mm, the permeability along the carbon fiber axis reaches its maximum value of 9.6×10 -11m 2, which increases by 546.0% compared to the unstitched fabric. This indicates that the introduction of stitch can effectively improve the permeability of the fabric. The efficiency of long edge injection is the highest, with a simulated injection time and actual error of 13.4%. With the increase of stitch density, the injection time of stitched foam sandwich composites increases firstly and then decreases, which may be the reason that the injection direction is in the same direction as the carbon fiber axis. Reference | Related Articles | Metrics

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Performance analysis of FRP grid reinforced fiber concrete sandwich composite wall panels CHENG Nengming, ZHANG Yaolin, CHANG Mingyuan, ZHANG Rong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 122-130.   DOI: 10.19936/j.cnki.2096-8000.20251128.015 Abstract （199）      PDF （12156KB）（399）       Knowledge map    Save To explore new wall panel materials and structural systems that are lightweight, high-strength, and have good thermal insulation properties suitable for prefabricated steel structure buildings, a new type of FRP grid reinforced fiber concrete sandwich composite wall panel was proposed in this paper, referred to as an FGRC sandwich composite wall panel. To study the flexural performance and failure modes of the FGRC sandwich composite wall panels, bending performance tests were designed and conducted on two FGRC sandwich composite wall panels with dimensions of 4 m×3 m and thicknesses of 100 mm and 150 mm respectively. The test results show that the main failure mode of the FGRC sandwich composite wall panels is flexural failure, with excellent interface connection performance. The ultimate flexural load capacity can reach up to 3.11 kN/m 2 and 4.05 kN/m 2. The ultimate fire resistance times are 1.1 hours and 1.5 hours, and the structural thermal resistances are 1.41 (m 2·K)/W and 1.72 (m 2·K)/W, respectively. The air-borne sound insulation and frequency correction amounts are 39(-2;-3) dB and 39(0;-2) dB, respectively. Overall, this wall panel shows significant application value. Reference | Related Articles | Metrics

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Electromagnetic performance analysis and optimization of curved functionally composite material structures LI Songming, YANG Shengshu, LIU Yushun, GUO Wen, XING Liying COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 85-91.   DOI: 10.19936/j.cnki.2096-8000.20260228.012 Abstract （122）      PDF （9376KB）（393）       Knowledge map    Save This article analyzes the electromagnetic performance of functional composite material structures with different curved profiles. The variation patterns of horizontal polarization electromagnetic performance in relation to different bending extents of functional composite structures are studied. The influence of core material electromagnetic properties on the horizontal polarization electromagnetic performance of the structures is also explored. Based on both the core material and structural form, an integrated optimization design is proposed to enhance the low-frequency electromagnetic performance of the functional composite structures. The results show that the average RCS for both metallic curved structures and functional composite material structures with horizontal polarization decreases gradually with increasing bending extent. The functional composite material structures exhibit an RCS reduction effect across various bending extents, but the RCS reduction effect weakens as bending extent increases. Merely altering the electromagnetic properties of the core material does not fundamentally address the issue of efficient low-frequency electromagnetic wave absorption in curved structures. A comprehensive approach, leveraging both the electromagnetic properties of the material and the structural advantages of the composite, is essential. By introducing gradient electromagnetic core materials and optimizing the core material filling structure, the low-frequency dual-polarization electromagnetic performance of the functional composite structures is enhanced. In particular, the RCS reduction effect in horizontal polarization in the L-band exceeds 8 dB compared to using a single type of electromagnetic core material. This article achieves functional composite material structures with highly efficient low-frequency reduction performance in the 1~4 GHz range, while also maintaining good broadband electromagnetic performance in the 4~12 GHz mid-to-high-frequency range. Reference | Related Articles | Metrics

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Research progress on influence factors of the mechanical properties of fiber-reinforced composite bolted joints ZHANG Yongliang, ZHANG Hui, YUAN Yi, WANG Xiaolong, YANG Xudong COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 135-144.   DOI: 10.19936/j.cnki.2096-8000.20260228.019 Abstract （169）      PDF （2427KB）（390）       Knowledge map    Save Bolted connections have been widely used in the field of aerospace due to their efficient and reliable connection performance. However, some issues, including delamination defects, perpendicularity errors, inevitably occur during the processing of holes in fiber-reinforced composite plates. Besides, the systematic and manual errors can also lead to the inappropriate preload or the existence of assembly gaps during the assembly process. Such will significantly affect the mechanical properties of bolted joint structure. In this work, we summarized four general influential factors on the properties of fiber-reinforced resin matrix composite bolted joints in machining and assembly processes: delamination defect, perpendicularity error, preload force and assembly gap. Meanwhile, their effects on mechanical properties and the corresponding reactional mechanisms have been systemically discussed. Moreover, we also proposed the future tendency of the factors affecting the mechanical properties of fiber-reinforced composite bolted joints. Reference | Related Articles | Metrics

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Advances in the application of ultra-high molecular weight polyethylene fibers in ballistic and blast-resistant composite materials ZHAO Lili, JIANG Bo, ZHAO Liang, CAO Yiru, SU Jiakai, LIU Meina COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (10): 60-67.   DOI: 10.19936/j.cnki.2096-8000.20251028.009 Abstract （322）      PDF （942KB）（389）       Knowledge map    Save Ultra-high molecular weight polyethylene fibers have become a core component in ballistic and blast-resistant composite materials due to their high specific strength, lightweight nature, and excellent energy absorption capabilities. This paper provides an in-depth analysis of the properties of UHMWPE fibers and their critical role in the protective mechanisms of composite materials. It systematically reviews recent advances and performance optimization strategies in key application areas such as ceramic composite armor, metal-based laminated structures, and hybrid systems. Particular emphasis is placed on innovative strategies—such as advanced surface functionalization, biomimetic gradient/multiscale architectures, and multifunctional integration—that have led to breakthroughs in enhancing interfacial strength, energy absorption efficiency, and resistance to multiple impacts. Despite significant progress, intrinsic challenges remain, including the material’s limited thermal resistance, the lack of core domestic production technologies for high-end fibers, and the need for cross-scale simulation and standardized evaluation systems. Future development trends are expected to focus on smart responsive composites, green and sustainable manufacturing, and integrated multifunctional materials. Reference | Related Articles | Metrics

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Study on the properties of PTFE substrate reinforced by quartz fiber BAI Mengzhao, WENG Xiaoyu, CUI Mengting, LONG Jin COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 72-77.   DOI: 10.19936/j.cnki.2096-8000.20260228.010 Abstract （190）      PDF （6929KB）（384）       Knowledge map    Save In this paper, quartz fiber paper was prepared by wet forming method with different ratio of micro and nano quartz fibers. After dipping in PTFE emulsion and pre-burning to remove small organic molecules, the composite substrate was prepared by hot pressing and sintering, and the dielectric, mechanical and thermal properties of the substrate were characterized and analyzed. The results show that the density and water absorption decrease with the increase of the content of quartz fiber while the proportion of total fiber remains unchanged. In terms of dielectric properties, the dielectric constant decreases with the increase of quartz fiber content. When the quartz fiber proportion reaches 80%, the dielectric constant is at its lowest to 2.21, and the dielectric loss presents a nonlinear relationship, and the lowest is 0.000 96 when the proportion of quartz fiber is 40%. In terms of thermal conductivity, the increase in quartz fiber content results in an enhancement of the composite’s thermal conductivity, and reaches a maximum of 0.232 W/(m·K) when the proportion of quartz fiber is 80%. In terms of mechanical properties, the tensile strength and elastic modulus decreased with the increase of quartz fiber content, and decreased to 17.85 MPa and 1538.76 MPa when the proportion of quartz fiber was 80%. Reference | Related Articles | Metrics

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Effect of loading rate on riveting strength of the single/double lap joints of CFRP/Al QIN Yucan, WANG Bingbing, WU Jinsen, JIN Wanjun, HE Chao, TANG Zhengqiang COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 65-71.   DOI: 10.19936/j.cnki.2096-8000.20260228.009 Abstract （139）      PDF （11264KB）（383）       Knowledge map    Save Riveted structures are often subjected to tensile loads at different loading rates, and the tensile rate has a significant impact on the strength of carbon fiber reinforced composites (CFRP)-metal riveted structures. To investigate the effect of loading rate on the single and double lap riveted joints strength of CFRP/Al, a numerical model of CFRP/Al single and double lap riveted joints was established using the VUMAT subroutine function in ABAQUS. This model is based on continuum damage mechanics, the 3D Hashin failure criterion, and strain rate effects. The study examined the impact of four tensile rates-1 mm/s, 100 mm/s, 200 mm/s, and 300 mm/s—on the strength of single and double lap riveted joints, and tensile tests were conducted to validate the accuracy of the numerical model. The results indicate that as the tensile rate increases, the strength of both single and double lap riveted joints also increases, with a more significant increase observed in double lap riveted joints. Additionally, as the tensile rate increases, the degree of damage to CFRP decreases, indicating that higher tensile rates have a noticeable suppressive effect on CFRP damage. Reference | Related Articles | Metrics

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Application of transfer learning in the prediction of elastoplastic response of short fiber reinforced polymers XING Wenqi, ZHU Shuiwen, WU Shunxin COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 10-19.   DOI: 10.19936/j.cnki.2096-8000.20260228.002 Abstract （156）      PDF （12490KB）（382）       Knowledge map    Save With the wide application of composite materials in aerospace and automotive fields, it has become more and more important to accurately predict their mechanical properties. In this study, a transfer learning-based stress-strain curve prediction method for short fiber reinforced polymers was proposed. Firstly, the database was constructed by DIGIMAT and the Latin hypercube sampling technique was used to select samples to improve the efficiency of model training. Then, using artificial neural network (ANN) as a surrogate model, and through the transfer learning method, the stress-strain prediction model of the new material can be quickly obtained. The results show that the transfer learning model can effectively capture the key features of the stress-strain behavior of materials, especially in predicting the fifth-order polynomial coefficients. The effects of fiber volume fraction and aspect ratio on the mechanical properties of materials were further analyzed, and it was found that the fibers with larger length-diameter ratios could transmit stress more effectively. This study provides an effective tool for the performance prediction of short fiber reinforced polymers, especially when data acquisition is difficult or the cost is high, the potential and application prospects of transfer learning in the performance prediction of composite materials are demonstrated. Reference | Related Articles | Metrics

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Preparation of in-situ polymerized cross-linked porous polyimide composite materials research on electrochemical performance LUO Farong, ZHANG Zhiming, CHEN Jian COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 40-47.   DOI: 10.19936/j.cnki.2096-8000.20251128.005 Abstract （169）      PDF （3460KB）（377）       Knowledge map    Save In this paper, cross-linked porous polyimide composites with different MWCNTs contents were prepared by in-situ polymerization using multi-walled carbon nanotubes (MWCNTs) as additive (INCPI@MWCNTs). The group, pore structure and adsorption properties of the cross-linked porous polyimide composites (INCPI@MWCNTs) were studied. The feasibility of using the cross-linked porous polyimide composites as positive electrode materials for lithium-sulfur batteries was discussed. The results show that in-situ polymerization has no effect on the cross-linking reaction and the structure of porous polyimide. Under the condition of nitrogen isothermal adsorption test of different specifications INCPI@MWCNTs, the nitrogen adsorption capacity increased with the increase of relative pressure due to the presence of large pore structure in the material. The BET specific surface area and micropore specific surface area of INCPI@MWCNTs gradually decreased with the increase of the addition of MWCNTs. The volume of micropores increased with the addition of MWCNTs. Using INCPI@MWCNTs as the positive carrier, S/PPI@MWCNTs positive carrier composite material was obtained by diffusion loading with sulfur, and lithium-sulfur battery was assembled for electrochemical performance test. Under the condition of 0.2 C current density, two discharge platforms and one charging platform appear in the charge and discharge curves of three different S/INCPI@MWCNTs positive terminals. The specific initial discharge capacity of the battery corresponding to S/INCPI@MWCNTs-2 is 1 326 mAh·g -1, and the retention capacity is 855 mAh·g -1 after 100 cycles, capacity retention rate is 65%. Under the condition that the current density is 1 C, the specific capacity of the first discharge of S/INCPI@MWCNTs-2 battery is 1 035 mAh·g -1, and after 400 cycles, the retention capacity is 662 mAh·g -1, and the capacity retention rate is 65%. S/INCPI@MWCNTs-2 as the cathode material can make the battery have better discharge specific capacity, rate performance and cycle stability. Reference | Related Articles | Metrics

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Composite delamination damage localization based on scattering source search methods YE Chenlu, ZHOU Shaoping, LUO Zhi, LI Qinfei COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 20-27.   DOI: 10.19936/j.cnki.2096-8000.20260228.003 Abstract （138）      PDF （7745KB）（376）       Knowledge map    Save Ultrasonic guided wave-based damage detection and localization methods are widely applied in various engineering structures. However, the anisotropy of composite materials increases the complexity of guided wave propagation, often resulting in oversized imaging areas and false artifacts, which compromise localization accuracy. In this study, a novel damage localization method for delaminations in composite plates is proposed, integrating delay-and-sum (DAS) principles with the sparrow search algorithm (SSA). By designing a fitness function based on the time of flight (ToF) of scattered signals, the damage imaging problem is transformed into a scattering source search problem. The fitness function evaluates the sparrow population distribution, iteratively refining the search process to approximate the most probable scattering source locations. The damage region is ultimately represented by the areas of sparrow aggregation. Experimental results demonstrate that, compared to traditional imaging methods, the proposed approach significantly reduces the localization area and enhances accuracy. Reference | Related Articles | Metrics

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Study on laser irradiation behavior of carbon fiber epoxy composites and preparation of coatings YANG Yu, WANG Siwei, MA Zhuang, GAO Lihong COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 44-48.   DOI: 10.19936/j.cnki.2096-8000.20260228.006 Abstract （152）      PDF （7572KB）（376）       Knowledge map    Save Carbon fiber epoxy composites have been widely used in aerospace and other fields, and with the development of laser technology, the study of the interaction between laser and materials is of great value. In this paper, the carbon fiber epoxy composite was irradiated with high energy continuous laser, and the new coatings were prepared on the surface of the carbon fiber epoxy composite with silicone resin as the base material, boron nitride as the filler, and polytetrafluoroethylene (PTFE) emulsion with different contents. At a power density of 17.1 W/cm 2, the damage degree of carbon fiber epoxy composite increases with the extension of irradiation time. The reflectance of the modified resin-based protective coating can reach to 83.7%. With the increase of PTFE content, the holes of the coating are reduced, the F—C—F bond is gradually strengthened, and the contact angle is increased, which improves the surface hydrophobic property of the coating. Reference | Related Articles | Metrics

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Synthesis and application of silicone modified thermosetting phenolic resin ZHAO Congcong, FENG Jiajia, AN Kunhua, LI Xuexue, LIU Cong, ZHANG Linqi COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 58-64.   DOI: 10.19936/j.cnki.2096-8000.20260228.008 Abstract （163）      PDF （6191KB）（372）       Knowledge map    Save In this paper, 3-isocyanatopropyl triethoxysilane (KH-907) was employed as a modifier, while phenol and formaldehyde served as monomer raw materials. The intermediate of N-(3-triethoxysilylpropyl) phenyl carbamate was synthesized by controlling the conditions of the addition reaction. Subsequently, this intermediate reacted with formaldehyde under the catalysis of an alkaline catalyst, successfully synthesizing the organosilicon-modified phenolic resin liquid (IPTES-PF). The chemical structure and curing behavior of the modified phenol-formaldehyde (PF) were investigated via fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The effects of the addition amount of organosilicon and the material ratio on the mechanical properties and thermal stability of the modified PF were studied through mechanical property tests and thermogravimetric (TG) analysis. The results indicated that the introduction of KH-907 enhanced the heat resistance of PF. Moreover, as the content of the modifier KH-907 and the molar ratio of formaldehyde increased, the mechanical properties of the organosilicon-modified PF initially rose and then declined. When the content of KH-907 was 15% and the molar ratio of phenol to formaldehyde was 1∶1.8, the mechanical properties of the organosilicon-modified PF resin liquid were optimal, with a tensile shear strength of 7.06 MPa and a peel strength of 328 N/5 cm. The impact strength of the silicone modified PF composite and the grinding ratio of the consolidated abrasive tool reach the maximum when the content of KH-907 is 15%, which are 2.87 kJ/m 2 and 20.913, respectively. Reference | Related Articles | Metrics

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Research on the winding process of the engine casing retaining ring YANG Fei, ZHU Guang, SUN Yu, GUO Jin, GAO Haiyuan, ZHENG Yaping, LIU Weiwei COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 97-103.   DOI: 10.19936/j.cnki.2096-8000.20260228.014 Abstract （147）      PDF （4855KB）（368）       Knowledge map    Save In this paper, the hot-melt method was used to prepare aramid/epoxy prepreg 023F/DBE-125 and fiberglass/epoxy prepreg SW280F/DBE-125. Composite material test plates were made using the autoclave process, and their mechanical properties and ballistic impact resistance were characterized. To address the deformation issues encountered during the winding, curing, and processing of the thin-walled engine casing, the mold and the assembly gap of the casing, along with the material’s thermal expansion differences, were used as the design basis for the winding mold of the engine casing retaining ring. Through simulation technology and process trials, suitable winding and processing parameters were determined. Using the parameters obtained from the trial pieces, composite retaining rings were wound onto thin-walled engine casings, and the formed retaining rings were subjected to dimensional and internal quality inspection. The test results show that the performance indicators of the developed engine casing retaining ring meet the required standards. This study provides an important reference for the lightweight design and manufacturing of engine casings and has significant implications for the development of key components in aircraft engines. Reference | Related Articles | Metrics

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Research on the impact resistance performance of ECC-BFRP reinforced composite shear wall for civil defense WANG Chong, LIANG Haizhi, CHEN Wenlong, XIE Jingru, JIN Zuquan, YE Haibin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 110-121.   DOI: 10.19936/j.cnki.2096-8000.20251128.014 Abstract （132）      PDF （37122KB）（361）       Knowledge map    Save In order to investigate the impact resistance of shear wall reinforced with engineered cementitious composite (ECC) and basalt fiber reinforced polymer (BFRP) reinforcement, an impact test was carried out on the reinforced human defense wall. The impact test was carried out on the reinforced human defense wall, and the finite element software ABAQUS was used to carry out numerical simulation based on the existing test at the same time. The accuracy of the numerical model was verified by comparing it with experimental results, and the influence of load levels and ECC thickness on the wall’s impact resistance performance was further analyzed. The results show that both the overall flexural stiffness and bearing capacity are significantly improved with the increase in ECC thickness. The concrete cracking is effectively controlled, and the rate of stiffness decline is reduced too. It can be concluded that the reinforcement method using ECC-BFRP can greatly enhance the impact resistance of the air defense walls, which will provide technical support for the structure upgrade of civil air defense projects. Reference | Related Articles | Metrics

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Research on the performance of three dimensional reinforced gradient thermal protection materials YU Shuai, ZHANG Pengfei, CUI Hong, LIU Jia, WAN Lei, HUO Shulin COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 92-96.   DOI: 10.19936/j.cnki.2096-8000.20260228.013 Abstract （160）      PDF （5247KB）（357）       Knowledge map    Save In response to the application requirements of thermal protection materials for hypersonic aircraft engines, this paper investigates the performance of three-dimensional reinforced quartz fiber/phenolic resin gradient thermal insulation materials. The preform is prepared using a 2.5D weaving/needle combined process, and the molding is carried out using a resin vacuum infusion process. Various tests and analyses were conducted on the mechanical properties, thermophysical properties, and ablation performance of the material. The results showed that when the total thickness was constant, the intermittent distribution of the weaving layer and the web layer along the thickness direction had a significant impact on the overall performance of the material. When the number of layers was small, its ablation performance was better, and when the number of layers was large, its thermophysical properties were better. The tensile and compressive mechanical properties were mainly affected by the distribution of the web layer and its interface with the weaving layer. The gradient thermal insulation material proposed in this article has the advantages of light weight, good anti-ablation performance, strong mechanical properties, and excellent resistance to airflow erosion, providing more material references for aerospace thermal protection engineering. Reference | Related Articles | Metrics

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Study on preparation and pullout performance of full-line rivets HUANG Jianlong, WU Ning, XÜ Junyi, AN Da, LIU Ce, CHEN Li COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 78-84.   DOI: 10.19936/j.cnki.2096-8000.20260228.011 Abstract （130）      PDF （11990KB）（354）       Knowledge map    Save Based on the issue of stitching thread pullout in carbon fiber three-dimensional preforms prepared using tufting processes after high-temperature treatment, a novel unilateral stitching technique-“riveting”-has been developed, with the stitching line referred to as a full-line rivet (FLR). In this study, a two-dimensional braiding technique was used to fabricate the FLR, and a three-dimensional fabric preform was created using the unilateral riveting technique. The research primarily focuses on the effects of FLR parameters and high-temperature treatment on the pullout performance of FLR. The results show that the pullout strength of FLR increases initially and then decreases as FLR weaving pitch increases. The pullout strength of FLR exhibits an exponential growth pattern with the increase in the number of woven strands. After the riveted preform undergoes high temperature treatment at 300~600 ℃ for 1 h, the pullout strength of FLR decreases from 25.79 N to 2.96 N, and the rate of performance degradation slows down as the temperature increases. Under the 600 ℃ treatment condition, the pullout strength of FLR is approximately 7 times higher than that of tufting. Reference | Related Articles | Metrics

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Study on low speed impact damage behavior of type Ⅳ composite gas cylinder LIU Yan, ZHOU Yinbo, HAN Bing, LIU Yan, DAI Xingtao, DENG Fanxu, LIU Peiqi, YANG Yan COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 120-129.   DOI: 10.19936/j.cnki.2096-8000.20260228.017 Abstract （138）      PDF （13047KB）（351）       Knowledge map    Save Plastic lined composite hydrogen storage cylinders (type Ⅳ hydrogen storage cylinders) have attracted widespread attention due to their advantages of lightweight, high strength, and good fatigue performance. However, the impact performance of foreign objects during transportation and use is unknown, which poses potential risks. This article combines experimental and numerical simulation methods to analyze the impact damage of type Ⅳ hydrogen storage cylinders. Firstly, impact tests were conducted on type Ⅳ hydrogen storage cylinders, and the depth and area of damage were measured and characterized. Then, a 3D finite element model of gas cylinder impact process considering intra layer and inter layer damage was established. Among them, the 3D Hashin criterion and Camanho empirical model are used to predict intra layer damage, and the cohesive zone model is used to predict inter layer damage. The simulation results have good consistency with the measurement results. Finally, based on the established model, the effects of impact angle, impact energy, and internal pressure on impact damage were studied. The results show that under different impact energies, the results of the model with cohesive elements are closer to the experimental values than those without cohesive elements. The impact energy dissipates within and between layers resulting in damage. The greater the depth of the pit, the greater the impact on the internal damage, resulting in more energy dissipated and less energy dissipated between layers. The smaller the damage impact angle, the larger the contact area between the impact object and the winding layer, and the larger the compressive area of the substrate, resulting in an increase in the damage area. Under pressure impact, the tensile damage to the substrate is more severe than without pressure impact, and the impact displacement is smaller. The research results of this article provide supplementary information for the study of delamination damage within and between the impact damage layers of composite material type Ⅳ gas cylinders. Reference | Related Articles | Metrics

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Research on lightweight design of automotive hybrid B-pillar assembly XU Liyou, GUO Yongzheng, ZHANG Shuai, LU Dongzhen COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 95-102.   DOI: 10.19936/j.cnki.2096-8000.20251128.012 Abstract （177）      PDF （10224KB）（348）       Knowledge map    Save To enhance the lightweight quality and crash safety of automobile B-pillar assembly, this paper puts forth a hybrid material B-pillar assembly design scheme comprising a high-strength steel outer plate, a carbon fiber composite inner plate, and a glued connection between the two. A finite element analysis model must be established for a dynamic impact drop hammer collision test of an automobile B-pillar. The validity of the model must then be verified from the hourglass energy test. A finite element model of a carbon fiber composite B-pillar reinforcing plate must be established, along with the layup design of the carbon fiber composite B-pillar reinforcing plate. Finally, the optimal carbon fiber composite layup sequence must be obtained. The carbon fiber composite B-pillar reinforcement plate was affixed to the high-strength steel outer plate via an adhesive bonding process to construct the B-pillar assembly specimen of the hybrid material. The accuracy and validity of the simulation model were further verified by dynamic drop weight tests and impact failure electron microscopy tests. The results demonstrated that the carbon fiber composite material B-pillar reinforcement panel reduced weight by 0.623 kg, and the hybrid material B-pillar assembly reduced the maximum displacement during the collision process by 12.8% in the falling weight impact test. The discrepancy between the simulation optimization and the actual test results did not exceed 5%. This substantiates the accuracy and reliability of this solution, and the lightweight effect and collision safety were markedly enhanced. Reference | Related Articles | Metrics

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Research on the strength and damage of bolted joint of thin plate composites LI Jie, BAO Zuguo, LI Qi, SUN Xiaowang, ZHOU Qiang, WANG Xianhui COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 8-19.   DOI: 10.19936/j.cnki.2096-8000.20251128.002 Abstract （180）      PDF （22858KB）（348）       Knowledge map    Save In this paper, the strength and damage process of composite thin plate bolted joint structures under tensile loading are investigated by experimental and simulation analysis. Firstly, the basic performance parameters of the composites were obtained by standard mechanical tests, and then tests were carried out on thin-plate composite joints with varying bolt preloads, different layup configurations, and both single and double bolt distributions. Based on the stiffness continuous degradation model and the three-dimensional Hashin failure criterion, the bolt preload was reverse-calculated by testing the friction between the overlap plates, and the preload of the bolt was simulated using an equivalent cooling method. Calibration of the open-hole plate was performed through both experiments and simulations, leading to the development of a three-dimensional finite element model of the bolted composite laminate. Finally, a progressive failure analysis was conducted to understand the strength and damage mechanisms of the composite plate joints. The results indicated that: with the increase of bolt preload, the peak load of the thin plate composite joint increases and the fracture displacement decreases; the damage process of the thin plate composite joints with different layups is related to the proportion of their layups; the ultimate load of transverse double-bolt joints is approximately twice as much as that of the single-bolt joints, and the ultimate limit of longitudinal double-bolt joints is slightly lower. Reference | Related Articles | Metrics

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Analysis of moment-curvature relations on PVC-CFRP tube confined reinforced concrete beams XU Guoshi, FAN Yujie, GAO Qing, YU Feng, YAO Xiaoguang COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (3): 1-9.   DOI: 10.19936/j.cnki.2096-8000.20260328.001 Abstract （154）      PDF （12196KB）（344）       Knowledge map    Save In this study, 20 PVC-CFRP reinforced concrete beams are subjected to stress tests. The effects of specimen size, hoop reinforcement ratio, width and number of layers of CFRP strips, bonding method of CFRP strips, layers of CFRP sheets and shear span ratio on the damage mode and moment-curvature relationship curves of the specimens were analysed. The results indicate that, the failure of the specimen was governed by the yielding of the stirrups and bottom longitudinal reinforcement, and the CFRP strips were subsequently ruptured in tension. In the elastic stage, with the improvement of reinforcement ratio, CFRP strip width and number of layers, and longitudinal CFRP sheet layer, the slope of the ultimate bearing capacity and moment-curvature relationship curves of the specimens increased, and the curvature development of the specimens slowed down obviously. As the shear-to-span ratio increases, the ultimate bearing capacity of the specimens decreases and the change of the moment-curvature curve is not obvious. In addition, under the same fiber ratio condition, the effect of CFRP strip bonding method on the specimens' bearing capacity and bending moment-curvature curves is not significant. Furthermore, on the basis of the tests, considering the influence of various factors on the moment-curvature relationship of the specimens, the adjustment factor of the bending stiffness of the specimens is introduced, and the calculation model of the moment-curvature relationship of the specimens is established. Reference | Related Articles | Metrics

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Research on integrated molding technology of large-sized 3D composite material frame QIN Chuang, ZOU Zhiwei, SHANG Weihui, SONG Hang, WANG Hongyu COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 111-119.   DOI: 10.19936/j.cnki.2096-8000.20260228.016 Abstract （142）      PDF （9154KB）（343）       Knowledge map    Save In order to achieve the integrated molding of large-sized 3D composite material frames, this study developed a process-structure integrated design and optimization plan. The molding process was reasonably selected and the water-soluble mold preparation process was optimized. Performance standards for water-soluble molds that meet the molding process of large-sized 3D frame structures were formulated. The feasibility of the structural design scheme and process was experimentally verified through the production of test specimens. A 3D integrated framework configuration that balances process feasibility and structural mechanical properties was formulated and applied in the development of actual products. The product has been validated through experiments, proving the feasibility of the technical solution, which provides reference for the integrated design of support structures of space camera. Reference | Related Articles | Metrics

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Optimized design on bonding and microwave absorption properties of MWCNT—NH 2 reinforced epoxy adhesive ZHENG Kunpeng, WANG Juntao, LIU Zetong, HAO Jingye, SHI Jianheng, CHEN Dingding COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (10): 1-5.   DOI: 10.19936/j.cnki.2096-8000.20251028.001 Abstract （173）      PDF （6269KB）（343）       Knowledge map    Save The design and preparation of functionalized composite structures often require adhesives with both mechanical properties and excellent electrical performance. In this study, multi-walled carbon nanotubes (MWCNT) and surface-aminated multi-walled carbon nanotubes (MWCNT—NH 2) were used as reinforcing fillers to investigate the effects of their contents and surface amination on the bonding and microwave absorption properties of epoxy adhesives. Results show that MWCNT significantly regulate the adhesive properties: with increasing content, the bonding strength exhibits a trend of first increasing and then decreasing, while the microwave absorption performance gradually enhances. Surface amination modification improves the interfacial compatibility between MWCNT—NH 2 and the epoxy matrix, thereby significantly optimizing the bonding performance. However, the introduction of surface functional groups alters the electronic structure of MWCNT—NH 2 and disrupts the conductive network, resulting in a substantial decline in the microwave absorption performance of the MWCNT—NH 2-modified adhesive compared to that of the unaminated MWCNT system. Reference | Related Articles | Metrics

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The effects of heat treatment process on the interface properties of 3D-printed continuous fiber reinforced composites SUN Shiyong, MA Xin, TANG Wenjie, YANG Rui, WEI Lei COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 104-110.   DOI: 10.19936/j.cnki.2096-8000.20260228.015 Abstract （146）      PDF （16161KB）（340）       Knowledge map    Save 3D-printed continuous carbon fiber reinforced composites (CCFRCs), with their exceptional properties such as high strength, high modulus, and lightweight, have extensive application potential in the aerospace and aviation sectors. However, the weak interfacial bonding between fibers and resin, especially the inadequate interlaminar performance, has become a critical factor limiting their further development. The effects of heat treatment on the interface properties and microstructure of 3D-printed CCFRCs were investigated. Through double cantilever beam (DCB) tests, the influences of process parameters such as ply angle, heat treatment temperature and heat treatment time on the interlaminar fracture toughness of CCFRCs were systematically investigated. Combined with scanning electron microscopy (SEM) analysis of fracture surface morphology, the mechanisms by which heat treatment affects the interlaminar performance of composites were revealed. The results show that the interlaminar fracture toughness of [0/45] 3 and [0/90] 3 specimens is higher than that of [0/0] 3 specimens. After heat treatment, the fiber bundles of [0/90] 3 specimens exhibit more matrix adhesion and rougher surfaces, leading to significantly improved interfacial bonding property. Among them, the interlaminar fracture toughness of [0/0] 3 specimens treated at 60 ℃ for 2 h reaches 1.570 kJ/m 2, representing a 50.67% increase compared to untreated specimens. In addition, longer heat treatment time results in more pronounced improvements in fracture toughness. Heat treatment enhances the interfacial bonding performance of CCFRCs and modifies their interlaminar failure mode by increasing resin fluidity, filling voids between deposition lines, and optimizing fiber alignment. Reference | Related Articles | Metrics

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Study on frequency response of chirp-excited Lamb wave in the localization of delamination damage in CFRP plate WU Yilun, FENG Bo COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 30-39.   DOI: 10.19936/j.cnki.2096-8000.20251128.004 Abstract （137）      PDF （23675KB）（335）       Knowledge map    Save Most current Lamb wave testing methods use a windowed narrow-band signal as the excitation signal to suppress the dispersion and facilitate the subsequent signal interpretation. A suitable center frequency should be selected to improve the signal-to-noise ratio during the measurement. However, the optimal detection frequency of the narrow-band signal often needs to be measured by several repeated experiments. A method for detecting delamination defects in carbon fiber reinforced composite plate is proposed, using a chirp signal as the excitation, which contains a broad frequency range, making more information contained in a single inspection. The narrow-band response of a series of frequencies is extracted using inverse convolution, and the optimal test frequency is selected for defect localization. It is verified by finite element simulation and experiment that the decomposed signal and the signal obtained from the direct excitation of the narrow-band signal are basically in agreement. The improved elliptical imaging algorithm is utilized for localization, and the effectiveness of the proposed method is verified experimentally. Reference | Related Articles | Metrics

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Effect of initial delamination defects in panels on the flexural properties of composite foam sandwich structures GU Nan, LIU Wenbo, WANG Peipei, YANG Fan, WANG Rongguo, ZHU Fuxian COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 34-43.   DOI: 10.19936/j.cnki.2096-8000.20260228.005 Abstract （134）      PDF （21573KB）（334）       Knowledge map    Save Composite foam sandwich structures are subject to delamination defects within their panels during manufacture and use, which can seriously affect the load-bearing properties of the structure. In this paper, the bearing performance of carbon fiber/polyurethane foam sandwich structures containing initial delamination defects within the panel under bending load is investigated using a combination of three-point bending test and finite element simulation, and the effects of the length and width of the initial delamination defects, as well as the location of delamination defect thicknesses, on the bending performance of the composite foam sandwich structures are analyzed. Based on the cohesive zone model (CZM), the extension evolution of initial delamination defects were analyzed, and the extension mechanism of initial delamination defects under bending load was discussed. The results show that the ultimate load decreases with the increase of the defect length and width, where the width has a greater influence; the expansion path of delamination defects is less affected by the size and shape, and the delamination defects expand transversely along the panel from the middle boundary of the defects; the location of the delamination defects is moved from the surface layer to the middle layer, and the ultimate load of the sandwich structure is then increased. Reference | Related Articles | Metrics

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Off-axis loading properties of three-dimensional six-directional braided composites in hot environment ZHANG Yujie, QIU Baoqiang, SHI Wenfeng, LIANG Yanmin, PENG Xin COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 130-134.   DOI: 10.19936/j.cnki.2096-8000.20260228.018 Abstract （123）      PDF （4888KB）（327）       Knowledge map    Save With the development of three-dimensional braided technology, three-dimensional braided structures have developed from the initial three-dimensional four-directional structure to three-dimensional five-directional, six- directional and seven-directional structures. At present, the high-temperature off-axial loading performance of three-dimensional six-directional and seven-directional braided composites remains to be further studied. This article is based on the development of a certain three-dimensional six-directional braided composite component, braids three-dimensional six-directional braided preform by using T800HB-12K carbon fiber. The composite part was prepared by RTM process with TDE-85 resin system as matrix. The internal quality of the composite part was detected by industrial CT, and the study on sixoff-axis loading tests of three-dimensional six-directional braided composite components at room temperature and high temperature were carried out. The results show that the three-dimensional six-directional braided composite part still have excellent in-plane properties at a high temperature of 105 ℃, but the off-axis loading performance declined comparing to room temperature conditions. The ultimate load under AY working condition can reach at least 150% design load due to the high integrity of its own structure. Reference | Related Articles | Metrics

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Investigations on large thickness honeycomb with curing pressure through a fine-structure numerical approach SHU-SHEN Yunhao, LU Honglong, XUAN Lixin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (11): 48-54.   DOI: 10.19936/j.cnki.2096-8000.20251128.006 Abstract （151）      PDF （14626KB）（326）       Knowledge map    Save To investigate the issue of lateral deformation and sliding of large thickness Nomex honeycomb in curing process, a fine-structure honeycomb finite element model was established and calculated, and the calculation results were compared with technological test results. The flatwise compression specimens of honeycomb were modeled first, and the calculation results indicated that the loading response is consistent with the experiment with a small error. It can prove the great accuracy of using 2D shell element to model the honeycomb cells. On this basis, a finite element model of the honeycomb forming technological specimens was established. After calculation, the local mechanical response of the honeycomb core in curing process was obtained and the transition from buckling of cells to sliding of specimens’ edges can be simulated. Compared with the technological test results, the deformation trend of honeycomb is basically consistent. Therefore, the fine-structure simulation model can provide a reference for technological test and the selection of honeycomb stabilization methods. Reference | Related Articles | Metrics