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Time-domain constitutive modeling of viscoelastic composites based on asymptotic homogenization method WU Shunxin, ZHU Shuiwen COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 8-14.   DOI: 10.19936/j.cnki.2096-8000.20250828.002 Abstract （211）      PDF （5361KB）（729）       Knowledge map    Save The aim of this paper is to establish an efficient and accurate method for modeling the macroscopic constitutive relationship of viscoelastic composites. By combining the asymptotic homogenization theory and the eigen-displacement method, a quantitative relationship between the microstructure and the macroscopic response is established. The reduced-order homogenization method is used to solve the characteristic displacement, which effectively improves the computational efficiency and directly obtains the macroscopic ontological relationship in the time domain. The obtained ontological relationship is embedded into the finite element software ABAQUS in the form of a user-defined material subroutine (UMAT), and the reliability of the model is verified by comparison with Digimat. The numerical results show that the fiber volume fraction and viscoelastic decay ratio have a significant effect on the stress relaxation behavior of the composites. As the fiber volume fraction increases, both the initial stress value and the stress relaxation rate of the composites increase; while the increase in the decay ratio leads to a slower stress relaxation rate. It is shown that the method can accurately predict the time-domain mechanical response of viscoelastic composites, which provides a strong theoretical support for the design and optimization of composites. Reference | Related Articles | Metrics

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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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Preparation of glass fiber reinforced epoxy resin prepreg for domestic radar cover and properties of composite materials ZHANG Jing, SU Hongjing, HE Jing, REN Liang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 140-147.   DOI: 10.19936/j.cnki.2096-8000.20250728.017 Abstract （233）      PDF （8299KB）（562）       Knowledge map    Save The material used for the domestic radar cover is glass fiber/epoxy prepreg prepared by solution impregnation method currently, the prepreg prepared by solution impregnation method has problems such as difficulty in accurately controlling resin and volatile content, as well as environmental pollution caused by solvent volatilization. The glass fiber/epoxy prepreg (ES78/E40) were prepared by hot-melt film method using domestic raw materials, and the physical properties of the ES78/E40 prepreg were systematically researched as well as the mechanical and flame retardant properties of the composite material. The relevant properties of prepreg prepared by solution impregnation method were compared. The results show that the physical, mechanical, and flame retardant properties of ES78/E40 prepregs meet the requirements. The room temperature tensile strength and compressive strength of domestically produced prepregs were 517 MPa and 443 MPa, respectively, and the tensile and compressive strength retention of composites was about 80% at 71 ℃; compared with the performance of prepreg prepared by solution impregnation method, the tensile and compressive properties have been improved by 11.8% and 9.9%, respectively. ES78/E40 prepreg can be applied to secondary load-bearing structural components such as domestic radar covers. Reference | Related Articles | Metrics

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Characterization and optimization of interfacial properties parameters for carbon fiber reinforced plastic/ethylene propylene diene monomer FANG Shirui, DING Anxin, YANG Fan, TANG Zijia, ZHAO Fei COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 85-93.   DOI: 10.19936/j.cnki.2096-8000.20250628.012 Abstract （165）      PDF （6974KB）（562）       Knowledge map    Save In order to obtain the interfacial properties parameters of carbon fiber reinforced plastic(CFRP)/ethylene propylene diene monomer (EPDM) adhesive for engines, this paper obtained the interfacial fracture energy and experimental curves based on DCB specimens and bilinear cohesive force models. Combined with the DCB simulation platform built using ABAQUS, the simulation curves were output. Based on the difference between the simulation curve and the experimental curve, establish a formula for the overlap between the simulation curve and the test curve as the optimization objective function. Use optimization algorithms such as response surface to solve for the minimum value of the function and its corresponding variable values, and obtain the accurate values of the interface properties parameters. This article uses a combination of properties testing, numerical simulation, and optimization calculation to obtain the properties parameters of the CFRP/EPDM adhesive interface, and verifies the parameters based on testing and simulation. The results are in good agreement, providing a criterion for interface failure and failure of engines in service engineering. Reference | Related Articles | Metrics

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Pore defects characterization and elastic parameters prediction of needle-punched ceramic matrix composites SUN Shiyong, LI Hailin, WANG Junlong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 20-27.   DOI: 10.19936/j.cnki.2096-8000.20250428.003 Abstract （219）      PDF （9138KB）（546）       Knowledge map    Save Needled-punched ceramic matrix composites are promising for a wide range of applications in hot-end structures in aerospace field. However, the manufacturing defects causing in the process of pre-fabrication and deposition lead to a high degree of dispersion in their properties. It is difficult to accurately predict their mechanical behavior. A sub-regional parametric characterization method for pore defects in needle-punched ceramic matrix composites was proposed based on X-ray microscopy and 3D image reconstruction techniques. Combined with the idea of probabilistic fitting, the size and structural characteristics of the material pore defects were parametrically characterized, and it was found that the equivalent diameter of the pores in the fiber-web layer was larger than that in the unidirectional layer, but the aspect ratio was smaller than that in the unidirectional layer. The elastic properties of the materials were predicted and analyzed using ellipsoid fitting and multiscale modelling methods, and the predictions differed from the experimental results by about 3.1% with good accuracy. The discussion of pore parameters revealed that: the unidirectional layer porosity has better uniformity in the distribution direction, and the reduction of the elastic properties in the direction of the fiber bundle length is lower than that in the other directions; in comparison, the fiber-web layer has higher porosity, and it is beneficial to reduce the porosity of the fiber-web layer to further improve the overall elastic properties of the material by improving the process parameters. 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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Investigation on the energy absorption mechanism and high-efficiency modeling method of carbon fiber reinforced composite structures WANG Kai, LUO Junjie, YAO Ruyang, PANG Tong, JIA Xiaohang, YU Lei COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 24-32.   DOI: 10.19936/j.cnki.2096-8000.20250828.004 Abstract （222）      PDF （11826KB）（509）       Knowledge map    Save Failure mechanisms of carbon fiber reinforced polymer (CFRP) are complex, and fine-scale simulations are costly with low optimization design efficiency. To improve the simulation and optimization design efficiency of energy-absorbing components of carbon fiber composite materials, CFRP thin-walled square tubes were prepared and axial compressive crushing tests were conducted. A multi-layered and refined finite element model of the axial crushing of CFRP thin-walled square tubes was established, and the experimental and simulated failure modes and energy-absorption mechanisms were analyzed. A high-fidelity and high-efficiency equivalent modeling method was proposed. The experimental results showed that the energy-absorption mechanism of the progressive crushing failure mode of the CFRP thin-walled square tube is complex, mainly including fiber fracture, delamination, and frictional dissipation. The simulation results showed that the refined finite element model can accurately modelling the progressive crushing failure behavior and energy dissipation of the CFRP thin-walled square tube. Plastic deformation and damage are one of the main factors of energy dissipation. Based on the progressive crushing failure mode, the proposed modeling method can accurately predict the energy absorption response of the CFRP thin-walled square tube. The relatively fine modeling method has increased computational efficiency by 97%. 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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Design and analysis of 30 kg composite tiltrotor VTOL fixed wing UAV LIU Feng, WEI Zhenpeng, MAO Jiayuan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 115-122.   DOI: 10.19936/j.cnki.2096-8000.20250728.014 Abstract （370）      PDF （6210KB）（493）       Knowledge map    Save A multi-role, long-endurance, vertical takeoff and landing tiltrotor composite fixed-wing UAV is designed. Maximum takeoff weight is 30 kg, and extended duration of flight is over 24 hours. Conceptual design, aerodynamic analysis and structure design of the UAV are completed. Static loading test of middle wing section is carried out, which is compared with numerical analysis data. Based on finite element analysis, the strength, stiffness and stability of the airframe are checked. Hashin failure criterion is used to determine the damage of carbon fiber panel and balsa wood core of composite sandwich structure, carbon fiber skin is also checked. Wing skin laminate design is optimized, and structure performance is assessed. It is showed that climbing by 2.5 g load with pay load below the fuselage is the severest load case. High stress state is found in the center aera of the middle wing. Buckling tends to occur firstly at the upper skin of the middle wing. Initial structure damage mode is compression damage of balsa core. Performance requirements with excessive load margin is satisfied by initial composite laminate layup. Wing skin laminate layup is optimized by sub-region semi equi-strength design. Weight of the wing is reduced by 1.51 kg, about 17% decrease. Wing load margin is reduced to 0.13 which shows outstanding improvement of structure loading efficiency. The endurance of the UAV is estimatedby energy consumption relationship. 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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Prediction method for ultimate strength of fiber-reinforced resin matrix composite structures CHENG Xianhe, CHENG Hongchuan, ZOU Zhiwei, LIU Jiaxin, LI Yulong, LIN Zaiwen COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 34-40.   DOI: 10.19936/j.cnki.2096-8000.20250628.005 Abstract （206）      PDF （7762KB）（483）       Knowledge map    Save A convenient and practical method for predicting the ultimate strength of structures was developed for accelerating the progress of structural design scheme demonstration in the early stage of projects. Firstly, an analytical expression for the equivalent modulus of laminate was derived based on the laminate theory. Secondly, according to the assumption that the failure occurred layer by layer and stiffness degradation, the first layer failure strength and ultimate strength of laminate are obtained by numerical algorithm. Then, by comparing the predicted values and the tested values of equivalent mechanical parameters of laminate, it was found that the predicted values of equivalent modulus are completely consistent with the tested values, the predicted values of ultimate tensile strength are also completely consistent with the tested values, only the predicted values of ultimate compressive strength were 10% lower than the tested values. Finally, the ultimate strength of typical end frame flange structures was predicted by the traditional structural finite element method, based on equivalent mechanical properties of laminate. Through comparison with test, it was found that the predicted ultimate load was 15% lower than the experimental failure load. The method has a fast calculation speed and enough precision for structural design scheme demonstration in the early stage of projects. Reference | Related Articles | Metrics

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Experimental and simulation study on lightning damage and protection of carbon fiber composites LI Yu, SI Xiaoliang, HUANG Yeyuan, LI Zhibao, DUAN Zemin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 68-73.   DOI: 10.19936/j.cnki.2096-8000.20250428.008 Abstract （231）      PDF （9677KB）（481）       Knowledge map    Save In order to study the lightning damage characteristics of carbon fiber composite laminates under different protection methods, the lightning damage of three kinds of carbon fiber composite laminates, which are unprotected, aluminum-coated and copper-mesh-protected, is studied by the way of simulation and test. Three kinds of laminated plate models are established in the finite element simulation software, and A+B+C * combined waveform lightning current is uniformly applied to analyze the damage characteristics of the laminated plate under different protective methods, at the same time, the protective effect of copper mesh with different characteristic parameters is evaluated. The simulation results show that the damage shape is determined by the conductivity laminates. The damage shape of unprotected laminates is related to the laminates, the damage area and depth of the laminate are reduced effectively with protection of spraying aluminum or copper mesh, the damage area and damage depth decrease with the increase of the width of copper mesh. The validity of the finite element model is verified by experiments. Reference | Related Articles | Metrics

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Study analysis of PVC-CFRP confined concrete column-RC beam exterior joints with core steel tube under low cyclic loading YU Feng, SHI Kun, GUAN Yucong, FANG Yuan, XU Bo COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 57-67.   DOI: 10.19936/j.cnki.2096-8000.20250428.007 Abstract （142）      PDF （19692KB）（478）       Knowledge map    Save In order to analyze the strain development law of the PVC-CFRP confined concrete column-RC beam exterior joints with core steel tube, through low cyclic tests of ten exterior joints with core steel tube(CST) and one typical joint. The effects of the steel ratio of the CST, stirrup ratio of the joint, axial compression ratio, longitudinal reinforcement ratio of the beam, and CFRP strips spacing were analyzed. The test results show that shear failure occurred at the joints, while no damage occurred at the PVC-CFRP confined concrete columns and beams. In the early stage, the shear force of the joint is mainly borne by the concrete; when the specimen bearing capacity reaches the peak bearing capacity, the diagonal pressure of the joint is still borne by the concrete, while the joint’s ring stirrups and the column’s longitudinal reinforcement jointly bear the diagonal tension. The CST can directly participate in the shear resistance. The calculating formula of the joint shear bearing capacity is proposed by considering the influence of the steel ratio of the CST, stirrup ratio of the joint, and axial compression ratio are considered, and introducing the comprehensive influence coefficient of joint shear resistance. The calculated results agree well with the experimental data. Reference | Related Articles | Metrics

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Correlation of heat distortion temperature and glass transition temperature of glass fiber reinforced unsaturated polyester resins and their matrix resins GE Ping, KONG Peng, MA Guorun, TANG Yuhang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 103-108.   DOI: 10.19936/j.cnki.2096-8000.20250428.013 Abstract （187）      PDF （2541KB）（474）       Knowledge map    Save Both of heat distortion temperature ( T HD) and glass transition temperature ( T g) are commonly used to characterize heat resistance of glass fiber reinforced unsaturated polyester resin matrix composites (GFRP) in lots of engineering design and applications. In this study, the suitable method of testing T HD of GFRP were established by selecting experimental approaches. The effects of curing systems and curing conditions of resins, different fabric pattern of reinforcement and fiber content of GFRP on their T HD and T g are studied. The correlation between T HD and T g of GFRP and its matrix resin was investigated. The initial temperature of glass transition T g,G′i and the final temperature of the glass transition T g,G′f by the curve of storage modulus vs. temperature are defined to be applied in manufacturing, inspecting and engineering application of GFRP. Reference | Related Articles | Metrics

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High strain rate impact behaviour of epoxy resins at different temperatures ZOU Kai, LIU Zheng, ZHAO Changfang, LIU Hao, LIU Chen, ZHANG Kebin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 1-7.   DOI: 10.19936/j.cnki.2096-8000.20250828.001 Abstract （325）      PDF （4900KB）（474）       Knowledge map    Save In order to study the dynamic compressive mechanical properties of epoxy resin under high strain rate loading and different temperatures, the yield stress of epoxy resin with strain rate of 0.001 s -1 was obtained through quasi-static test, and then the dynamic compression test of epoxy resin was conducted by SHPB method. The stress-strain curves under uniaxial compression at temperatures of 25 ℃, 50 ℃ and 70 ℃ and strain rate of 1 000 s -1, 2 500 s -1, 3 000 s -1 were obtained, and the dynamic constitutive relations including strain rate effect and temperature effect of epoxy resin at high strain rate were obtained. The results show that the epoxy resin has strain rate effect, and the development trend of the stress-strain curves of the three high strain rates is the same. Finally, the relationship between yield stress, temperature and strain rate was fitted to describe the relationship between yield stress and temperature of epoxy resin at high strain rate. Based on this, the established constitutive model considering the influence of strain rate and temperature can well describe the stress-strain relationship of epoxy resin at high strain rate, and the research results can provide references for the study of constitutive model of epoxy resin. 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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Lightweight design and optimization of CFRP material mining helmet SHI Linxin, WANG Haijun, WANG Honglei COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 125-134.   DOI: 10.19936/j.cnki.2096-8000.20250428.016 Abstract （135）      PDF （10264KB）（471）       Knowledge map    Save In order to solve the problem of excessive weight of the mining helmet, carbon fiber reinforced composite (CFRP) material was devised to substitute for the conventional ABS plastic to realize the lightweight design of the mining helmet. The finite element model of steel ball-helmet for collision simulation was established. The mechanical properties of ABS and CFRP helmet shell were compared and analyzed in simulation. The strength and stiffness of CFRP helmet shell are superior to ABS casings, and have better protective properties. The input-output relationship between CFRP lamination parameters and helmet mechanical properties was simulated by BP neural network. And the global optimization of helmet mechanical properties was realized by particle swarm optimization algorithm. The optimization results indicate that the optimal lamination parameters consist ofa total number of 6 layers of CFRP, with each layer having a thickness of 0.2 mm and arranged in the following angle sequence . The collision simulation results show that the optimized CFRP helmet’s top experiences a maximum deformation of 19.601 mm, while the headform endures a maximum force of 4.891 kN. The optimization configuration can meet the requirements of relevant national standards and achieve a lightweight design with 49.3% weight reduction compared with the ABS helmet shell. Reference | Related Articles | Metrics

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Study on the effect of hygrothermal environment on the strength of resin pre-coated composite-titanium alloy bonded joint ZHENG Simin, ZHAO Jiangming, CUI Jiuyang, ZHENG Yanping COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 19-26.   DOI: 10.19936/j.cnki.2096-8000.20250628.003 Abstract （209）      PDF （9876KB）（469）       Knowledge map    Save The bonding between carbon fiber reinforced polymers and titanium alloys is widely used in aircraft structures to achieve light weight and sufficient strength. In this study, the combination treatment of pickling, anodizing and a special resin pre-coating technology was used to improve the bonding strength of the adhesive layer/titanium alloy interface. At the same time, in order to compare the failure of the 2 joints(no reinforcement treatment and resin pre-coating treatment) after hygrothermal aging, 80 ℃/95%RH was selected as the aging environment, and the tensile test of single lap adhesive bonding was conducted after aging. The results show that the strength of the joint reinforced by resin pre-coating increases by about 52.54% without aging. After 30 days of aging, the tensile strength of the unstrengthened joints decreased by about 20.83%, while the tensile strength of the joint after the resin pre-coating treatment decreased by about 30.44%. Resin pre-coated treatment not only increased the interface bonding strength of titanium alloy plate/adhesive layer, but also played a positive role in the cohesion strength of the adhesive layer. However, compared with the initial joints, the pre-coated resin reinforced joints are more sensitive to the environment. Reference | Related Articles | Metrics

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Experimental and numerical simulation of bonding properties of NiTi-SMA wire/epoxy resin interface LU Chunling, GAN Xiao, DU Shiyuan, WANG Qiang, ZHU Wanxu COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 10-18.   DOI: 10.19936/j.cnki.2096-8000.20250728.002 Abstract （177）      PDF （11679KB）（467）       Knowledge map    Save Studied the influence of various factors on the interfacial bonding performance between nickel-titanium shape memory alloy (NiTi-SMA) wire/epoxy resin. Firstly, the bonding strength of the SMA wire/epoxy resin interface was determined by SMA wire pull-out tests, focusing on the effects of adhesive type, SMA wire bonding length, and prestrain level on the interfacial failure mode and bonding strength. Then, based on the cohesive zone model, numerical simulation of the interfacial mechanical behavior were conducted to further analyze the shear stress distribution during the SMA wire pull-out process. Finally, a load-slip constitutive model was established based on the experimental results. The results show that the failure modes of Sikadur-330 CN and Lica-102 are both interfacial bonding failures between SMA wire and epoxy resin, with effective bonding lengths ranging from 2.0 cm to 3.0 cm. The epoxy resin Sikadur-330 CN exhibits the best bonding performance, with a bonding strength approximately 1.20~1.42 times that of the other adhesive. The bonding strength at the prestrain level of 12% is 1.37~3.16 times that of other pre-strain levels. The established load-slip constitutive model can effectively simulate the mechanical behavior of the SMA wire/epoxy resin interface. This study provides theoretical support for the preparation and practical engineering applications of FRP/SMA composite materials. Reference | Related Articles | Metrics

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Research on residual strain monitoring and failure behavior of thick L-shaped composite laminates WANG Weilun, CAO Zihe, YU Xingchen, LU Yixian, CAO Dongfeng, HU Haixiao, JI Yundong, LI Shuxin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 1-10.   DOI: 10.19936/j.cnki.2096-8000.20250428.001 Abstract （261）      PDF （15927KB）（465）       Knowledge map    Save The study involves monitoring residual strains and investigating failure behavior in thick L-shaped composite laminates. It aims to explore how the stacking sequence under high thickness conditions affects the structural load-bearing capacity and failure modes. Utilizing embedded fiber bragg grating (FBG), the study monitors the evolution and distribution characteristics of the temperature field and strain field within the curved region of the L-shaped composite laminate during the curing process. It aims to investigate how thickness and ply orientation angle influence the thermal residual strain and spring-in angle in L-shaped composite laminates. Conducting bending tests, utilizing DIC(digital image correlation) to observe the strain field and failure modes in the lateral cross-section. And comparing the results with empirical formulas, exploring the influence of thermal residual stress under different ply orientations on the load-carrying capacity and failure modes. The results indicate that the large-thickness L-shaped laminates exhibit a certain temperature gradient, but the temperature difference between the upper and lower layers and the middle layer is relatively small. Due to the mold effect, L-shaped laminates with angles are more likely to generate pre-loaded regions on the inner side of the corner compared to pure 0° ply. The results of the bending test indicate that the ultimate load obtained for pure 0° ply is essentially consistent with the theoretical prediction. However, for quasi-isotropic ply, the ultimate load is 25% smaller than the theoretical prediction. The pre-load region has a certain influence on the subsequent load-carrying capacity and failure mode. Reference | Related Articles | Metrics

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Preparation and properties of 2.5D fabric/phenolic composite material by rolling impregnation LI Ran, ZHAO Yibo, WU Wenjing COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 108-114.   DOI: 10.19936/j.cnki.2096-8000.20250728.013 Abstract （191）      PDF （6269KB）（460）       Knowledge map    Save This article focuses on the roller impregnation method and studied the influence of five process parameters on the quality of impregnated fabrics and the physical and mechanical properties of composite materials through the design of a five factor and three level orthogonal experiment. The research results indicate that the number of cycles in the impregnation process has the greatest impact on the resin content, followed by the resin preheating temperature. Rolling impregnation is suitable for low resin preheating temperature (30 ℃) and multiple rolling cycles (≥5 cycles) to ensure that the prepreg fabric has a high resin content, resulting in ideal resin content, density, and thickness of the composite material. The size of the mesh has a significant impact on the uniformity of fabric impregnation. A smaller mesh size (0.8 mm) is more conducive to uniform rolling impregnation, and the resulting composite material has higher mechanical properties. Reference | Related Articles | Metrics

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Prediction of composite material cure deformation and mold surface optimization CHEN Heng, MA Xiuju, SUN Longgang, MAO Haifeng, ZHOU Xian COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 104-110.   DOI: 10.19936/j.cnki.2096-8000.20250828.012 Abstract （239）      PDF （5480KB）（458）       Knowledge map    Save This paper establishes a multi-factor numerical model for the curing process of composite materials, exploring the temperature distribution of parts during resin curing using a thermo-chemical coupled heat transfer model. A constitutive model based on instantaneous linear elasticity theory, considering the evolution of material parameters, was used to describe the mechanical behavior of the material during the phase change process, predicting the curing deformation trend of end-rib honeycomb sandwich components. The reliability of the model was validated through experimental results. Based on the simulation analysis results, the tool surface was optimized. A comparative analysis was conducted between the parts prepared using the optimized tooling and the theoretical part surface. After tool optimization, the maximum deformation of the molded part’s surface compared to the theoretical part dimensions was reduced by 86.98%. 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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Advances in the application research of thermoplastic composites in the aerospace field LIU Daijun, MA Xiaoyi COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 142-147.   DOI: 10.19936/j.cnki.2096-8000.20250828.017 Abstract （393）      PDF （3527KB）（448）       Knowledge map    Save Thermoplastic composites (TPC) have the characteristics of light weight, high strength and recyclability. They are one of the key materials to achieve the goal of Net Zero. They can be used in key components such as aircraft fuselages and wings, and have great application potential in the aviation field. This article describes the application of TPC in the aviation field, reviews the research progress of TPC, summarizes the key technologies and development trends of TPC, and finally summarizes and prospects the future development and challenges of TPC from the perspectives of materials, equipment, processes, and applications. 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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Moisture absorption behavior of epoxy resin cured products and its influence on the dielectric properties ZHANG Dujuan, LI Yafeng, LI Songming, LU Haijun COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 66-73.   DOI: 10.19936/j.cnki.2096-8000.20250828.008 Abstract （291）      PDF （5649KB）（444）       Knowledge map    Save To investigate the moisture absorption behavior of epoxy resin and the changes in its dielectric properties post-absorption, the study developed epoxy resins with various structures by varying the type of curing agent. The moisture absorption rate of the cured materials was monitored under 70 ℃ water immersion conditions, and the dielectric properties were tracked. The results indicated that the moisture absorption process followed the Fick diffusion model, the type of curing agent affects the polarity and free volume of the cured material, the polarity determines the equilibrium moisture absorption rate of the resin, and the polarity and free volume jointly determine the diffusion coefficient of water molecules. The greater the polarity, the higher the moisture absorption rate of the resin equilibrium, and the easier it is for the polar groups to form hydrogen bonds with water molecules and hinder the movement of water molecules. The larger the free volume, the more diffusion channels the water molecule has, and the faster the diffusion. The dielectric properties of the cured matter are different with different curing agents, and the dielectric constant and loss tangent change linearly with the moisture absorption rate and are independent of the type of curing agent. Based on this research, a model was developed to predict the dielectric properties of epoxy resins as a function of their moisture absorption rates, with a deviation of no more than 10% between model predictions and actual measurements. Reference | Related Articles | Metrics

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Numerical simulation on the tensile properties of composite titanium alloy bolted connections with sleeve CUI Jiuyang, ZHAO Jiangming, ZHENG Simin, ZHENG Yanping COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 19-26.   DOI: 10.19936/j.cnki.2096-8000.20250728.003 Abstract （218）      PDF （7726KB）（440）       Knowledge map    Save Based on experimental verification of the feasibility of the simulation model, this paper investigates the influence of sleeve material, bolt aperture size and bolt preload on the tensile properties of composite-titanium alloy bolted joints with sleeve, using numerical simulation methods. This research provides some theoretical guidance for the design of the structure. The results indicate that the influence of sleeve material on the bearing capacity of bolted joints with sleeve is negligible. When the bolt aperture is between 5 mm and 7 mm, increasing the bolt hole size can enhance the bearing capacity of the joint. With the 7 mm bolt aperture, the tensile failure load of the joint with sleeve increases by 32.21% compared to the joint without sleeve. However, when the hole diameter exceeds 7 mm, the bearing capacity of the joint will decrease. When the tightening torque ranges from 0.5 N·m to 3.5 N·m, increasing the bolt tightening torque can enhance the bearing capacity of the joint. But exceeding 3.5 N·m results in a decline in the bearing capacity of the joint. Reference | Related Articles | Metrics

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Curing deformation simulation of foam sandwich composite C-shaped panels NIE Zhiwei, LUO Qi, HUO Yufan, ZHOU-HE Lezi, ZHOU Huamin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 86-96.   DOI: 10.19936/j.cnki.2096-8000.20250828.010 Abstract （199）      PDF （17988KB）（439）       Knowledge map    Save Based on the curing deformation mechanism of sandwich composites, a numerical simulation model of the curing deformation of sandwich composites was established for sandwich composite C-shaped contour panels. The simulation results show that at the beginning of demolding, the inner surface of the C-shaped profile plate is subjected to tensile stress while the outer surface is subjected to compressive stress, and the whole component shrinks inward. Based on this simulation model, the curing deformation law of the C-shaped contour panels under different process conditions, such as the type of material at the gap, the number of layers, and the angle of the layer, was investigated. It is found that the curing deformation is the smallest when the gap was not filled with any material, and the curing deformation was the largest when it is filled with composite material; the deformation is positively correlated with the number of layers within a certain range; the lay-up angle has little effect on the deformation. In addition, a number of C-shaped contour panels with the corresponding process conditions were molded, and the curing deformation of the panels was determined by three-dimensional scanning. The simulation conformed well to the experiment, thus verifying the accuracy of the simulation model and realizing the accurate prediction of the curing deformation of C-shaped contour panels. Reference | Related Articles | Metrics

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Research on composite material inclusions defect detection based on improved YOLOv8 WU Zhicheng, WANG Mingquan, XIE Shaopeng, LU Yupeng, CAO Zhenfeng, WANG Jinhua COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 27-33.   DOI: 10.19936/j.cnki.2096-8000.20250628.004 Abstract （180）      PDF （4838KB）（438）       Knowledge map    Save In order to solve the problem of insufficient detection accuracy caused by small target size and similar features in the detection of composite inclusion defects, an improved YOLOv8 algorithm was proposed. First, the SPD convolution module is introduced to reduce information loss, and the MCA attention mechanism is incorporated to enhance the three-dimensional channel feature extraction capability, thereby improving defect recognition accuracy. Subsequently, the BiFPN bidirectional pyramid network was used to improve the multi-scale feature fusion to improve the model’s ability to identify similar features and size difference defects. Finally, to tackle the bottleneck of small target detection, a Shape IoU loss function is added to optimize the shape and scale of bounding boxes, improving the detection performance for small-size defects. Experimental results show that the improved algorithm achieves a 10.1% increase in mAP@0.5 and a 7.4% increase in mAP@0.95, with an 8.1% improvement in recall rate. The test results in the composite material defect detection system validate the reliability and practicality of this method, providing an efficient and accurate technical solution for composite material inclusion defect detection. 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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Permeability prediction model of two-dimensional fiber fabrics with shear deformation based on ellipse tensor superposition YUE Wuyang, LUO Hao, WU Yibo, ZHOU-HE Lezi, ZHOU Huamin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 28-36.   DOI: 10.19936/j.cnki.2096-8000.20250428.004 Abstract （166）      PDF （7900KB）（436）       Knowledge map    Save Permeability is a key parameter in the molding process of fiber composites, which is determined by the fiber structure. For the component with curvature, the fiber shear deformation is hard to avoid, which changes the fiber structure and affects the permeability. In order to study the changing trend of fiber in-plane permeability under shear deformation and to establish the prediction model of permeability main value and direction, two-dimensional radial flow experiments were used to test the permeability of woven fiber and non-crimp fiber. By ellipse tensor superposition and Kozeny-Carman equation, fiber redirection and fiber volume fraction were extracted as the main influencing factors of permeability. The factors were quantified to establish a permeability prediction model. By combining the theoretical model with the experimental data and several sets of literature data, the model parameters are further simplified, and the in-plane permeability prediction model is obtained which is widely applicable to orthotropic woven fiber fabric and non-crimp fiber fabric. Reference | Related Articles | Metrics

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Experimental investigation on the axial compressive behavior of GFRP-pipe-encased concrete columns with spiral reinforcement JING Chenggui, WU Tong, ZHAO Lin, CHEN Zongping COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 1-9.   DOI: 10.19936/j.cnki.2096-8000.20250628.001 Abstract （211）      PDF （12540KB）（433）       Knowledge map    Save This study aims to the axial compression performance of GFRP pipe spiral reinforcement composite confined concrete columns. A total of 29 specimens were fabricated and subjected to axial compression tests, with variations in concrete strength, yield strength of spiral reinforcement, stirrup ratio of spiral reinforcement, and longitudinal reinforcement ratio as parameters. The failure process of the specimens was observed, and the failure modes of different specimens were summarized. The load-displacement and load-strain curves were obtained. The influence of various parameters on the axial compression performance of specimens was investigated. The test results indicate that specimens fail due to the fracture of the GFRP tube, the crushing of the core concrete, or the breakage of the spiral reinforcement. Ultimate load-bearing capacity of GFRP tube spiral reinforced concrete columns increases with rising concrete strength, while their deformability diminishes. With increasing yield strength and stirrup ratio of spiral reinforcement, both the ultimate load-bearing capacity and shape-shifting capability of GFRP-pipe spiral reinforced concrete columns enhance. The longitudinal reinforcement ratio has minimal influence on these columns. GFRP pipe can enhance the axial compression peak stress of reinforced concrete columns by over 30%, and increase the ductility coefficient by over 90%. The addition of spiral reinforcement can increase the axial compressive peak stress of GFRP-pipe concrete columns by over 10%, and enhance its ductility by over 20%. Finally, a formula for calculating the axial compression bearing capacity of GFRP-pipe spiral reinforced composite confined concrete columns is proposed, and the calculated results closely align with the experimental findings. Reference | Related Articles | Metrics

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Manufacturing methods and research progress of continuous fiber composite honeycomb core materials LUO Yunfeng, KANG Mingjia COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 133-140.   DOI: 10.19936/j.cnki.2096-8000.20250628.018 Abstract （419）      PDF （8455KB）（428）       Knowledge map    Save Honeycomb core materials have attracted wide attention due to their low density, lightweight, high specific strength, high specific stiffness, excellent compressive performance, and good thermal insulation properties. Currently, they have been widely used in various fields such as aerospace, vehicles, ships, construction, and mechanical engineering. In recent years, continuous fiber reinforced composite honeycomb cores with lightweight and excellent mechanical properties have gained attention as replacements for traditional aluminum honeycombs and aramid paper honeycombs. This article provides a comprehensive review of the latest research progress on carbon fiber and glass fiber reinforced composite honeycomb cores. In terms of carbon fiber composite honeycomb cores, different preparation methods such as hot press molding method, vacuum-assisted resin transfer molding method, inter-locking method, 3D printing method, and tailor-folding method are introduced. Regarding glass fiber composite honeycomb cores, the focus is on the research progress in preparation methods. This article reviews the recent advances in the field of continuous fiber reinforced composite honeycomb cores, aiming to provide an indepth overview for beginners in this field. Reference | Related Articles | Metrics

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Finite element simulation modeling and analysis of the dynamic physical processes involved in curing composite components SUN Siyuan, YANG Yong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 97-103.   DOI: 10.19936/j.cnki.2096-8000.20250828.011 Abstract （259）      PDF （6321KB）（423）       Knowledge map    Save Reinforced composite materials quickly rise to prominence in advanced material applications due to their lightweight nature as well as their exceptional resistance against high temperatures and corrosion. They are currently a focal point in researches related to advanced material science, such as high-speed rail technology and other emerging fields. This study aims to provide a more precise analysis of solidified dynamic physical simulations relating to composite components. In this study, we choose the COMSOL Multiphysics software to conduct comprehensive simulations on the temperature field and the solidification field of a C-beam structure. First, we establish simulation models about the temperature field and the solidification field of the C-beam structure. Second, we analyze the solidification dynamic physical process during the forming process of the composite material pressure vessel, using the numerical analysis of finite element under the preset attributes of the composite material molds and parts when the pressure vessel is formed. Finally, we acquire a deviation not above 2.5% through analyzing the simulation data. Meanwhile, this study proposes new directions on the optimizing the solidification process of composite material parts in pressure vessels through analyzing the temperature curves of the C-beam structure on five feature points. 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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Experimental study on milling force of carbon fiber composite laminates CUI Yi, DONG Juan, ZHANG Xinggan, TAN Menghua, LIU Songnian, ZHAO Juan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 91-98.   DOI: 10.19936/j.cnki.2096-8000.20250728.011 Abstract （223）      PDF （6058KB）（422）       Knowledge map    Save In order to reduce delamination and other damages during milling of carbon fiber reinforced composite (CFRP), improve its service life and production efficiency, the experiment of milling CFRP unidirectional laminates along various fiber angles ( θ) was carried out by MV80 three-axis CNC machining centers. Based on the single factor experimental method, the influence of fiber angle and milling parameters on milling force and milling surface quality was studied. The results show that the main milling force is positively correlated with fiber angle at<90°, and negatively correlated with fiber angle at>90°; as the spindle speed increases, the main milling force decreases, and the main milling force increases with the increase of milling depth and feed rate per tooth; in different fiber directions, the surface roughness of CFRP decreases with the increase of spindle speed, but increases with the increase of milling depth and feed rate per tooth. When the fiber angle is 90°, the surface quality is optimal. The weight of milling force affected by different parameters is analyzed by orthogonal experiment. The results show that the fiber angle is the most important factor, followed by milling depth. And a mathematical model for milling force processing was constructed through linear regression of experimental data, aiming to provide a certain reference basis for optimizing processing parameters and digital processing of carbon fiber epoxy resin based composite. 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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Experimental and numerical simulation of crack propagation evolution of PVDF membrane LI Wenrui, LIU Ping, YIN Lingfang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 43-53.   DOI: 10.19936/j.cnki.2096-8000.20250828.006 Abstract （158）      PDF （20773KB）（416）       Knowledge map    Save The tearing resistance is very important to the safety of the membrane structure. In the present paper, uniaxial tensile test and numerical simulation were carried out to study the tearing behavior of PVDF membrane with initial slit. The numerical model of yarn and matrix microstructure was established using ANSYS LS-DYNA software, and the tearing process of membrane was analyzed under different slit angles and positions. The tearing strength and failure mode characteristics of the film were obtained, and the effects of different slit angles on the tearing properties of the textile were discussed. The results show that according to the different angle of slit, the section shaped like “a straight line” “Z” and “√” can be formed; under tearing test and numerical simulation, the slit expansion process of the film are identical, and the matrix breaks before the yarn. The error of the numerical simulation is less than 10% at different angles, which indicates that the finite element method can predict the tearing strength of the film well. Reference | Related Articles | Metrics