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Progress in the preparation and application of carbon fiber reinforced polymer mirrors WU Di, LIU Zhu, BI Tuanli, CHENG Luchao, LIU Zhenyu, ZHANG Jifeng COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 135-146.   DOI: 10.19936/j.cnki.2096-8000.20250928.017 Abstract （304）      PDF （16426KB）（820）       Knowledge map    Save Carbon fiber reinforced polymer (CFRP) composites have emerged as ideal materials for lightweight mirror design in large-aperture space telescopes and adaptive optical systems due to their high specific stiffness, low areal density, and excellent thermal stability. Systematically review advances in CFRP mirror design, manufacturing processes, environmental adaptability studies, and their applications in large telescopes. Research demonstrates that optimizing layup design, refining curing processes, and enhancing surface treatment techniques effectively suppress fiber print-through (FPT) and curing-induced residual stress, achieving surface accuracy up to λ/10 (root mean square, RMS). However, the hygroscopicity of CFRP and anisotropy in their coefficients of thermal expansion (CTE) remain critical challenges for practical engineering applications. This paper further discussed the combination of active optical control technology with CFRP mirror, which adjusted the surface shape according to the change of force and environment, and verified its potential application in deformable mirror and large aperture splicing mirror. In the future, it is necessary to focus on the development of new matrix materials, multi-field coupling mechanism analysis and long-term service performance evaluation to promote the reliable application of CFRP mirrors in extreme environments. Reference | Related Articles | Metrics

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Research progress on new resin-based ablative thermal protection materials for thermal protection of hypersonic vehicle LI Zhuangzhuang, LIU Xinhao, MU Xiujuan, WANG Qikun COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 147-156.   DOI: 10.19936/j.cnki.2096-8000.20250928.018 Abstract （404）      PDF （10922KB）（751）       Knowledge map    Save Efficient and reliable thermal protection materials are the key to the development of hypersonic vehicles. Facing the development needs of new long-term and ultra-high temperature resistant thermal protection materials for hypersonic aircraft in the future, this paper reviews the research status of new resin-based ablative thermal protection materials at home and abroad. The development prospect of gradient design and preparation of low density resin-based ablative thermal protection materials is prospected, and specific suggestions for the future development direction of new resin-based ablative thermal protection materials are put forward. Reference | Related Articles | Metrics

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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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Preparation and properties of graphene/PCM composites based on Pickering emulsion method ZHUO Qing, WANG Shiyi, ZHAO Wei, LI Mingpu, WANG Yuqi, LI Yuanyuan, LI Yingru COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 1-7.   DOI: 10.19936/j.cnki.2096-8000.20250928.001 Abstract （242）      PDF （5030KB）（703）       Knowledge map    Save As a typical phase change material (PCM) for energy storage, paraffin (PA) was found to possess shortcomings such as easy leakage and poor thermal conductivity, which had limited its large-scale market application. To address this issue, solidified paraffin/graphene (PaGr) composites were prepared by a one-step hydrothermal method, in which PA served as the matrix phase change material and reduced graphene oxide (RGO) acted as the confining carrier. During the hydrothermal process, the Pickering emulsion, configured with GO as a stabilizer, facilitated the effective recombination of paraffin and graphene. XPS and Raman spectroscopy were employed to confirm the successful conversion of GO into RGO during the hydrothermal reduction process. The microstructure, thermophysical properties, and structural stability of the PaGr composite PCM were characterized through optical microscopy, DSC, and thermal cycling. The experimental results show that PaGr composites can effectively improve the shape instability and high thermal resistance caused by PA liquid leakage. Compared with pure PA, its thermal conductivity and structural stability are improved, which indicates that PaGr composites have broad application prospects in the field of PCM. Reference | Related Articles | Metrics

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Semi-analytical simulation method for bi-directional FGM cantilever beam under stochastically distributed load ZHANG Long, ZHANG Wei, FAN Juntao, LIAO Wenlin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 16-26.   DOI: 10.19936/j.cnki.2096-8000.20250928.003 Abstract （161）      PDF （12156KB）（693）       Knowledge map    Save In order to study the mechanical behavior of bi-directional functionally graded material (FGM) cantilever beam under stochastically distributed load, a semi-analytical method of high precision and efficiency is developed in this paper. Firstly, the physical model of the bi-directional FGM cantilever beam is introduced, and then the basic control equations of the cantilever beam subjected to stochastically distributed load are derived. Then, iterative solution of the equations is complemented through MATLAB programming. Based on this, a case study of unidirectional/bi-directional FGM cantilever beams subjected to pure bending load or uniformly distributed load is carried out, where the results are compared with the exact solution, Timoshenko beam theory results and graded finite element method results, indicating that the proposed method has good convergence and high accuracy. Finally, the proposed method is used to simulate and analyze the mechanical behavior of bi-directional FGM cantilever beams under linearly distributed load, sinusoidally distributed load or stochastically distributed load. The results obtained are in good agreement with the simulation results of the gradient finite element method, where the maximum relative errors for deflection and stress are within 2.11% and 3.39%, respectively. Reference | Related Articles | Metrics

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Simulation study on grommet hole reinforcement technology for composite structure and its fatigue life prediction SUN Zhuowei, YUAN Guoqing COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 125-134.   DOI: 10.19936/j.cnki.2096-8000.20250928.016 Abstract （194）      PDF （10206KB）（691）       Knowledge map    Save Cold expansion technology is a technique widely used to improve the fatigue life of aerostructures. For composite open-hole structures, the grommet can be expanded into the hole to effectively improve the fatigue life of the laminate. Based on the FEA software ABAQUS, this paper simulates the process flow of grommet hole reinforcement technology of composite laminate, predicts the fatigue life of the laminate after hole reinforcement, and studies the influence of different degrees of cold expansion (DCE) on the fatigue life of the laminate. The results show that: grommet hole reinforcement can generate a certain residual stress field on the hole edge of the laminate and the grommet. There are certain differences in the residual stress field of each layer, and the compressive residual stress on the extrusion outlet surface of the grommet is the highest; there is an optimal DCE , under which the reinforcement will not damage the laminate, and can also generate a suitable residual stress field in the structure, which can maximize the fatigue life of the laminate. The optimal DCE is 2% for the research object in this paper; if the DCE is too large, the grommet hole reinforcement will cause damage at the edge of the hole, mainly the matrix compression damage, which will affect or even reduce the fatigue life of the laminate. Reference | Related Articles | Metrics

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Cars design and analysis of composite rear seat back panel for passenger cars GUANG Yubo, REN Mingwei, QIU Rui, CAO Qinglin, WANG Yong, WANG Xinyu COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 110-116.   DOI: 10.19936/j.cnki.2096-8000.20250928.014 Abstract （226）      PDF （13802KB）（689）       Knowledge map    Save In order to reduce the weight of car seat back panels, glass fiber composite materials are used instead of metal materials, and the lightweight effect is verified through simulation and trial production testing. Establish models of metal and glass fiber composite back panel, collision simulation analysis is conducted according to GB 15083—2019 standard, and the results meet the requirements. The glass fiber composite back panel was producted by using integrated injection molding process, weighing 5.04 kg, which achieved a weight reduction of 31.05% compared to metal (iron) back panel weighing 7.31 kg. Through the swing arm collision test, the maximum relative error between the measured deformation and simulated deformation of the glass fiber composite back panel was 3.2%, and the simulation results were reliable. After the collision, the glass fiber composite back panel did not fail and remained in its original locking position, meeting the requirements of the standard luggage impact test. The glass fiber composite back panel achieved the expected lightweight effect. Reference | Related Articles | Metrics

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Application and research of finite difference method in static testing of large wind turbine blades FANG Siming, ZHUANG Lei, ZHOU Xiaoliang, KONG Kui, XU Liqiang, ZHANG Dinghao, LI Yalong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 93-97.   DOI: 10.19936/j.cnki.2096-8000.20250928.012 Abstract （174）      PDF （5303KB）（686）       Knowledge map    Save In order to design a full-size static loading scheme for wind turbine blades more quickly and conveniently, this paper proposes a static loading method based on finite difference method for iterative calculation. Firstly, simplify the blade into a cantilever beam model with variable cross-section; secondly, based on the approximate differential equation of the deflection curve of the cantilever beam, the finite difference method is used to iteratively calculate the final deformation of the blade by correcting the cross-sectional bending moment according to the geometric shape of the blade; then, based on the final geometric shape of the blade, the static loading design of the scheme is carried out; finally, the method was applied to the static testing of 100-meter-class blades, and compared and analyzed with the calculation results of ANSYS software and actual test results to verify the effectiveness of the method proposed in this paper. This method can quickly calculate blade deformation, iterate static loading schemes, and improve the design efficiency of static testing loading schemes. Reference | Related Articles | Metrics

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Research on mode Ⅰ interlaminar properties of chopped fiber-interleaved carbon fiber reinforced composites based on DIC DENG Yu, TU Haoyun COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 8-15.   DOI: 10.19936/j.cnki.2096-8000.20250928.002 Abstract （235）      PDF （17303KB）（684）       Knowledge map    Save As an efficient and convenient interlaminar toughening method, chopped fiber interleaved composites has been widely used to enhance the interlaminar mechanical properties of composites. Current research lacks a systematic exploration of the three-dimensional image experimental data for the interlaminar cracking process in carbon fiber-reinforced composites with chopped fiber interlayers. In this study, carbon fiber/epoxy composite laminates toughened with chopped aramid fibers and chopped flax fibers were prepared. The toughening effects of chopped fibers were investigated through double cantilever beam (DCB) experiments, and digital image correlation (DIC) was employed to investigate the surface strain field and damage evolution in the chopped fiber interlayer-toughened composites. The interlaminar toughening mechanisms of different chopped fibers were analyzed. The experimental results demonstrated that the interlaminar insertion of chopped aramid fibers and chopped flax fibers significantly enhanced the mode Ⅰ fracture toughness of the composite laminates. During the delamination process in the toughened DCB specimens, fiber bridging and fiber pull-out phenomena were observed. Compared to chopped flax fibers, the chopped aramid fibers exhibited more pronounced fiber bridging and crack deflection, leading to better interlaminar toughening effects. These findings provide an experimental foundation for optimizing the performance of composite. Reference | Related Articles | Metrics

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Influence of chamfering angle on the curing deformation characteristics of L-shaped composite truss WANG Yan, HUANG Yongyong, LI Yichao COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 65-74.   DOI: 10.19936/j.cnki.2096-8000.20250928.009 Abstract （212）      PDF （28377KB）（682）       Knowledge map    Save To solve problems of structure assembly difficulty and loading reliability reduction caused by curing deformation of U-shaped composite trusses, this paper established a composite material curing deformation simulation model under the framework of ABAQUS. Based on this model, the effects of structural shape and layup angle on the cure deformation of L-shaped composite truss were investigated. By comparing with the experimental results of the curing deformation of three asymmetric layups of L-shaped composite trusses, it was found that the maximum calculation error of the simulation model was 11%. Based on this model, the curing residual stress field and curing deformation characteristics of L-shaped composite trusses with lay-up angles of [0/0/45/-45] S, [0/90/45/-45] S, [90/90/45/-45] S were investigated under different chamfer radii. The results showed that the chamfer radius and lay-up angle of the composites significantly affected the curing deformation and residual stress of the components. With the increase of chamfering radius, the curing residual stresses and deformations of the three layup specimens showed a decreasing trend. Under the same chamfering radius, the curing deformation and residual stress of the [0/90/45/-45] S specimen was the smallest among the three ply designs. These results indicated that increasing the chamfering angle of the L-shaped truss and designing a reasonable and uniform layup angle can help to reduce the curing deformation of the L-shaped composite truss. Reference | Related Articles | Metrics

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Effects of weft yarn deflection angle in the thickness direction on the warp-direction tensile mechanical behavior of 2.5D woven composites JIANG Pengfei, LI Lei, ZHANG Yifan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 75-83.   DOI: 10.19936/j.cnki.2096-8000.20250928.010 Abstract （182）      PDF （12599KB）（655）       Knowledge map    Save 2.5D woven composites demonstrate promising application prospects in aerospace and other fields due to their excellent integral structural characteristics. However, the deflection characteristics of weft yarns in the thickness direction of preforms lead to more complex mechanical properties and failure mechanisms, significantly limiting their widespread application in engineering fields. This study focuses on typical 2.5D woven T300/QY8911-Ⅳ composites. By establishing unit-cell models with weft yarn deflection angles of 0°, 5° and 20°, and incorporating the 3D Hashin failure criterion and Mises failure criterion, a progressive damage model for 2.5D woven composites was developed to systematically investigate the warp-direction tensile mechanical behavior under different deflection angles. The results indicate that as the weft yarn deflection angle increases, the warp-direction tensile strength of 2.5D woven composites shows a trend of first increasing and then decreasing. This research provides theoretical foundations for the structural design and engineering applications of 2.5D woven composites, holding important practical engineering significance. Reference | Related Articles | Metrics

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Effect of layering sequence on low velocity impact properties of flax/basalt fiber hybrid reinforced composites MU Wenlong, CHEN Liangyu, LI Shijie, ZHANG Shikun, JIANG Junwei COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 27-34.   DOI: 10.19936/j.cnki.2096-8000.20250928.004 Abstract （203）      PDF （8894KB）（654）       Knowledge map    Save This study examines the effects of different layering sequences on the mechanical properties of flax/basalt fiber hybrid reinforced composites. The resin transfer molding process was used to prepare pure flax fiber, pure basalt fiber, and flax/basalt fiber hybrid reinforced composite laminates with two different stacking sequences. Low-velocity impact and post-impact bending tests were performed to reveal the influence of layering sequences on the mechanical properties and failure mechanisms of the hybrid composites. The study found that in the low-velocity impact test, the mechanical properties of the hybrid composites were between pure flax fiber and pure basalt fiber composites. [B 4F 4] S exhibited a higher peak force than [F 4B 4] S(where B denotes the basalt fiber layer, F denotes the flax fiber layer), and the energy absorbed by [B 4F 4] S was higher. In the three-point bending test, the mechanical properties of the undamaged hybrid composites were between pure flax fiber and pure basalt fiber composites. However, after impact damage, the post-impact bending strength retention rates of both hybrid composites were higher than those of pure flax fiber and pure basalt fiber composites, and under the same impact energy, the post-impact bending strength retention rate of [F 4B 4] S was higher. Reference | Related Articles | Metrics

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Effects of nano calcium carbonate on the properties of frontal-polymerized dicyclopentadiene resin LI Kehui, ZHANG Yueyao, SONG Longjie, YANG Liling, CHEN Dingding, XING Suli, YIN Changping, TANG Jun COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 35-41.   DOI: 10.19936/j.cnki.2096-8000.20250928.005 Abstract （197）      PDF （8737KB）（647）       Knowledge map    Save This study was systematically conducted to investigate the effects of nano-CaCO 3 modification on the processing, thermal stability, and mechanical properties of frontal-polymerized dicyclopentadiene (DCPD) resin. The results demonstrate that the incorporation of nano-CaCO 3 significantly optimized the processing window of DCPD resin. Thus, the initial curing temperature and peak curing temperature are decreased by 16.16 ℃ and 13.92 ℃, respectively, while the room-temperature gelation time extends beyond 2.5 h. Furthermore, as nano-CaCO 3 suppressed the mobility of molecular chain, the glass transition temperature ( T g) is elevated to 127.9 ℃, which is a 33.79% increase over that of the pure resin. Mechanically, the flexural strength, tensile modulus, and impact strength are improved to 60.53 MPa, 1.90 GPa and 4.84 kJ/m 2 with the optimal nano-CaCO 3 content (3wt%~4wt%), representing improvements of 13.27%, 57.02% and 9.09%, respectively. However, due to the stress concentration caused by the agglomeration of nano-CaCO 3 particles at high content (>5wt%), the mechanical properties of the DCPD resin are degraded. This work could provide insights for designing high-performance frontal-polymerized polymer composites with tailored processability and thermal-mechanical properties. 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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Prediction of bonding strength between helically wound FRP bars and concrete based on GEP HU Cong, YANG Lang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 117-124.   DOI: 10.19936/j.cnki.2096-8000.20250928.015 Abstract （124）      PDF （5383KB）（624）       Knowledge map    Save Bonding strength is an important index to evaluate the bond performance between fiber-reinforced polymer (FRP) and concrete. Due to too many influencing factors, the prediction accuracy of the bonding strength of the relevant specifications and the mathematical model established by the researchers is low. In order to solve the above problems, a database containing 81 groups of bonding strength between helically wound FRP bar and concrete was established by collecting relevant references, and a mathematical prediction model was established based on gene expression programming (GEP) algorithm. The GEP model was compared with the mathematical formula based on the experimental data. The evaluation indexes included determination coefficient ( R 2), mean absolute error (MAE) and root mean square error (RMSE). The results show that the R 2, MAE and RMSE of the bonding strength prediction model based on GEP are 0.867, 1.510 and 1.853, respectively. Compared with the existing prediction models with the highest accuracy, the GEP-based prediction model R 2 is increased by 39.39%, MAE is decreased by 31.79%, and RMSE is decreased by 27.48%. Reference | Related Articles | Metrics

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Optimization of cure uniformity for thick-section composite materials before and after gelation based on thermo-fluid-solid multi-physics coupling HUANG Shunfeng, LIU Wenbo, WANG Peipei, YANG Fan, WANG Rongguo, HU Kejun COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 47-54.   DOI: 10.19936/j.cnki.2096-8000.20250928.007 Abstract （241）      PDF （4875KB）（601）       Knowledge map    Save To address quality defects arising from non-uniform temperature and cure degree fields before and after gelation in the curing process of thick-section composite materials, a multi-objective optimization approach for cure uniformity is developed. This approach utilizes a thermo-fluid-solid multi-physics coupled finite element model in conjunction with optimized Latin hypercube sampling (OLHS) to construct a radial basis function (RBF) surrogate model. The goal is to optimize the uniformity of temperature and cure degree gradients before and after gelation. Compared to the original design, the optimization results demonstrate a decrease in temperature gradients of 51.7% and 66.5% before and after gelation, respectively, and a reduction in cure degree gradients of 33.3% and 63.6%, respectively, with only a 6.7% increase in total curing time. The maximum temperature peak during the entire curing process was reduced by 8.8%. These results indicate that the proposed method can significantly improve the uniformity of curing before and after gelation. Reference | Related Articles | Metrics

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Study on preparation and compression failure behavior of 3D woven honeycomb composite materials GUO Jing, JIAO Yanan, ZHOU Qing, WAN Xili, CHEN Li COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 55-64.   DOI: 10.19936/j.cnki.2096-8000.20250928.008 Abstract （219）      PDF （11820KB）（556）       Knowledge map    Save To address the issue of structural failure due to cracking at the adhesive joints of honeycomb walls during use, this paper utilizes 1 000 D aramid fibers as reinforcement and epoxy resin as the matrix. A 2.5D loom and vacuum assisted resin transfer molding (VARTM) process were used to prepare an integrated fiber-reinforced honeycomb three-dimensional woven composite material. The failure modes of the honeycomb three-dimensional woven composite material under out-of-plane loads were analyzed, revealing that the failure modes include fiber breakage, matrix failure, and overall crushing and buckling collapse of the honeycomb structure. To more accurately investigate the mechanical response and damage evolution of the 3D woven honeycomb composite material under out-of-plane compressive loads, a multi-scale damage model of the 3D woven honeycomb composite material was established using numerical simulation. By comparing the model with experimental results, it was found that the two show good agreement. Finally, a structural parameterization discussion of the 3D woven honeycomb composite material was conducted, exploring the influence of honeycomb side length and wall thickness on the out-of-plane compressive performance of the honeycomb. 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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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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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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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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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 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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Prediction of axial bearing capacity of GFRP-reinforced concrete columns based on Bayesian-Bagging-XGBoost algorithm TANG Peigen, LI Xiaoliang, HE Xin, MA Guohui, ZHANG Xiang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 98-109.   DOI: 10.19936/j.cnki.2096-8000.20250928.013 Abstract （159）      PDF （3583KB）（434）       Knowledge map    Save Due to the differences in mechanical properties between steel bars and glass fiber reinforced polymer (GFRP) bars, the axial bearing capacity of GFRP bar-reinforced concrete columns cannot be simply calculated using the methods for reinforced concrete columns. To improve the accuracy of the predictive model for the axial bearing capacity of GFRP bar-reinforced concrete columns, this study used 253 sets of experimental data as the basis for modeling with the extreme gradient boosting (XGBoost) algorithm. Bayesian optimization and Bagging algorithms were employed to optimize the XGBoost algorithm to enhance the model’s predictive accuracy, stability, and training efficiency. The model was evaluated using the coefficient of determination ( R 2), mean absolute error (MAE), and relative root mean square error (RRSE) and compared with existing predictive models. The study found that Bayesian optimization and Bagging algorithms effectively improved the training efficiency and predictive accuracy of the model. The proposed Bayesian-Bagging-XGBoost model achieved R 2, MAE, and RRSE values of 0.691 6, 418.162 9, and 0.555 3, respectively, which are significantly better than those of existing predictive models. This model provides a more accurate reference for the engineering application of GFRP bar-reinforced concrete columns. Reference | Related Articles | Metrics

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Synthesis and characterization of graft modified high heat-resistant vinyl resin LIU Hua, TANG Wenjin, LIU Zhengbiao, CHEN Jianhui, SHU Da, LIU Shiqiang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (9): 42-46.   DOI: 10.19936/j.cnki.2096-8000.20250928.006 Abstract （167）      PDF （3861KB）（425）       Knowledge map    Save Three acrylate prepolymers were synthesized from hydroxyethyl methacrylate (HEMA), pentaerythritol triacrylate (PETA) or dipentaerythritol pentaacrylate (DPHA) and isophorone diisocyanate, reacting at a molar ratio of 1∶1. Then the prepolymers were grafted to phenolic vinyl ester resins by the catalysis of dibutyltin dilaurate (DBTDL). The heat distortion temperature (HDT), glass transition temperature ( T g), and thermal decomposition temperature of different acrylate grafted vinyl resins were studied. It is revealed that 20wt% DPHA prepolymer graft vinyl resin behaved the best heat resistant property, with HDT of 230 ℃, T g of 220 ℃ and 5wt% thermal decomposition temperature of about 330 ℃. 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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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

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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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Study on the influence of PVDF electrospun nanofiber membranes with different areal densities on the interlaminar fracture toughness of CF/EP composite laminates PENG Yan, WEI Liaoxian, ZENG Tangyu, MA Chuanguo COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 15-23.   DOI: 10.19936/j.cnki.2096-8000.20250828.003 Abstract （169）      PDF （9973KB）（413）       Knowledge map    Save This study examines the reinforcing impact of polyvinylidene fluoride (PVDF) nanofibrous membranes when used as an additive material on the interlaminar fracture toughness of carbon fiber/epoxy (CF/EP) composite laminates with different areal densities. Here, PVDF electrospun nanofibrous membranes with three different areal densities (9 g/m 2, 15 g/m 2, 28 g/m 2) were prepared and inserted into the interlaminar layers of the laminates for experimental analysis. The results show that the PVDF nanofibrous membrane with a 15 g/m 2 areal density provided the most significant enhancement of the interlaminar fracture toughness of the laminate, with 67% and 13% enhancement of the mode Ⅰ and mode Ⅱ fracture toughness, respectively, with respect to that of the laminate without the introduction of the PVDF nanofibrous membrane. SEM analysis reveals that the toughening mechanism of PVDF nanofibrous membranes mainly included the processes of fibre bridging, pull-out and fracture. Furthermore,based on the numerical simulation of mode Ⅰ and mode Ⅱ interlaminar fracture behaviours using the finite element simulation method with cohesion model, it is found that the incorporation of PVDF nanofibrous membranes did not significantly change the interface strength of the interlaminar region, but effectively prevented the propagation of the interlaminar cracks through the action of the fibrous skeleton. The numerical simulation results were in good agreement with the experimental results, which verifies the feasibility of cohesion model in simulating the interlaminar cracks in PVDF nanofibrous membranes. Reference | Related Articles | Metrics