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Status and application in aerospace of advanced thermoplastic composite materials ZHAO Miao COMPOSITES SCIENCE AND ENGINEERING    2024, 0 (12): 147-152.   DOI: 10.19936/j.cnki.2096-8000.20241228.020 Abstract （474）      PDF （3976KB）（355）       Knowledge map    Save Advanced thermoplastic composite material is a new kind of promising composite for aeroplane structural parts application with the advantages of good recycling, reutilization, post forming, short processing cycle, high manufacturing efficiency and high toughness. In this paper, the main performance characteristics of resin matrix,thermoplastic prepreg for advanced thermoplastic composite material and the state of the arts in thermoplastic composite manufacturing were summarized. The applications of advanced thermoplastic composite material in overseas aviation equipment were introduced. The focus for research and development of advanced thermoplastic composite in the future on thermoplastic prepreg manufacture in high quality and high efficiency, automated tape placement combined with in-situ consolidation and automatic welding were also proposed. 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 （400）      PDF （8455KB）（411）       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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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 （374）      PDF （3527KB）（437）       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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Comparative study of glass transition temperature of epoxy resin tested by different methods LIU Wei COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (5): 45-49.   DOI: 10.19936/j.cnki.2096-8000.20250528.006 Abstract （355）      PDF （2893KB）（351）       Knowledge map    Save Glass transition temperature ( T g), as an inherent property of materials, is theoretically independent of the testing method. However, in practice, significant discrepancies often arise between results obtained using different methods and instruments. This study focused on epoxy resins that can be fully cured, using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) to measure T g respectively. By comparing the results from these two techniques, the research identifies the causes of discrepancies in T g values, such as differences in testing methods, instrument types, heating rates, and other factors. The study also explores new approaches to improving the consistency, reliability, and comparability of thermal performance ( T g) characterization across different materials. Reference | Related Articles | Metrics

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Study on temperature-dependent thermal expansion properties of carbon fiber and CFPR YANG Cheng, JIANG Pengfei, ZHU Liping, DONG Jiping, WANG Jingyuan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (1): 35-41.   DOI: 10.19936/j.cnki.2096-8000.20250128.006 Abstract （331）      PDF （7545KB）（232）       Knowledge map    Save The thermal expansion coefficient of TG300/epoxy uniaxial fiber reinforced composites at -100~120 ℃ was measured according to GB/T 2572—2005. The longitudinal and transverse thermal expansion characteristics of uniaxial composites with temperature are presented. The axial and radial thermal expansion coefficients of TG300 carbon fiber in the temperature range of -100~120 ℃ were obtained through parametric inversion analysis, which would provide material performance data for composite materials design when focus on thermal expansion characteristics. Further, the thermal expansion coefficients of uniaxial CFRP and biaxial CFRP were calculated, and the effects of temperature, fiber volume fraction, fabric structure, structure parameters and fiber buckling on the thermal expansion performance of the composite were analyzed, which provided a theoretical basis for the structural design and optimization of zero thermal expansion composite. 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 （323）      PDF （6210KB）（456）       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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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 （311）      PDF （4900KB）（462）       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 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 （304）      PDF （4592KB）（618）       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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Advances in the application of ultra-high molecular weight polyethylene fibers in ballistic and blast-resistant composite materials ZHAO Lili, JIANG Bo, ZHAO Liang, CAO Yiru, SU Jiakai, LIU Meina COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (10): 60-67.   DOI: 10.19936/j.cnki.2096-8000.20251028.009 Abstract （284）      PDF （942KB）（368）       Knowledge map    Save Ultra-high molecular weight polyethylene fibers have become a core component in ballistic and blast-resistant composite materials due to their high specific strength, lightweight nature, and excellent energy absorption capabilities. This paper provides an in-depth analysis of the properties of UHMWPE fibers and their critical role in the protective mechanisms of composite materials. It systematically reviews recent advances and performance optimization strategies in key application areas such as ceramic composite armor, metal-based laminated structures, and hybrid systems. Particular emphasis is placed on innovative strategies—such as advanced surface functionalization, biomimetic gradient/multiscale architectures, and multifunctional integration—that have led to breakthroughs in enhancing interfacial strength, energy absorption efficiency, and resistance to multiple impacts. Despite significant progress, intrinsic challenges remain, including the material’s limited thermal resistance, the lack of core domestic production technologies for high-end fibers, and the need for cross-scale simulation and standardized evaluation systems. Future development trends are expected to focus on smart responsive composites, green and sustainable manufacturing, and integrated multifunctional materials. Reference | Related Articles | Metrics

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An establishment of a UV photocuring resin curing kinetic model PENG Jingxuan, DING Anxin, XU Mi, HU Xueqin, YANG Lin, GUO Ning COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 10-18.   DOI: 10.19936/j.cnki.2096-8000.20250628.002 Abstract （277）      PDF （9395KB）（354）       Knowledge map    Save The study of photocuring kinetics is an important part of photocuring research. Using an external UV light source coupled with differential scanning calorimetry, the photocuring behavior was tested at different light intensities and temperatures. This investigation provided heat flow curves, curing degree curves, and curing rate curves for the resin during the curing process. The autocatalytic model was used to fit the curing rate curves. The parameters obtained were fitted using linear or nonlinear regression to establish the curve function relationship. Previous studies had limitations as they almost considered the effect of a single variable on the photocuring kinetics model. This paper proposed a hypothesis that simultaneously incorporated curing temperature and light intensity as variables within the derived photocuring kinetic equation. The reliability of the proposed photocuring kinetics model was verified by comparison between actual experiment and finite element curing simulation. The maximum error between simulation and actual experiment is calculated to be no more than 6.5%. This study extends the understanding of photocuring kinetics and provides new perspectives and methods for optimizing the photocuring process. Reference | Related Articles | Metrics

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Application and development trends of composite materials in civil aircraft XU Lin, LIU Chuanjun, ZHAO Chongshu COMPOSITES SCIENCE AND ENGINEERING    2024, 0 (9): 98-104.   DOI: 10.19936/j.cnki.2096-8000.20240928.015 Abstract （272）      PDF （4591KB）（227）       Knowledge map    Save “One generation of aircraft, one generation of materials”, materials are the foundation of aircraft manufacturing. In over a hundred years of world aviation history, the speed of aircraft development largely depends on materials. Composite materials have greatly promoted the development of the civil aircraft industry due to their high specific strength and modulus, good fatigue and corrosion resistance, and low density. At present, the amount of high-performance composites has become one of the important indicators to measure the progressiveness of civil aircraft. This article focuses on a series of aviation composite material research plans formulated and implemented by European and American countries, as well as the important achievements made. It introduces the development process of aviation composite materials in China. Summarized the current application status of composite materials in the field of civil aircraft both domestically and internationally. With the support of national policies and based on the future demand for domestic civil aircraft, this paper analyzes the advantages of composite material application in reducing aircraft structural weight, reducing operating costs, and improving economy from the aspects of raw materials, structural component manufacturing, and process equipment. The opportunities and challenges of composite material application in domestic civil aircraft are discussed. 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 （260）      PDF （5649KB）（429）       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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Research progress on the modification of bismaleimide resin with allyl-based chemicals KONG Dechuang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 124-132.   DOI: 10.19936/j.cnki.2096-8000.20250628.017 Abstract （254）      PDF （2299KB）（389）       Knowledge map    Save Bismaleimide (BMI) resin has been used in a wide range of fields because of its excellent mechanical properties and thermal stability. However, BMI resin has the disadvantages of high melting point, poor processing ability, high curing temperature and great brittleness. The most commonly used modification method is the addition of allyl compounds and BMI copolymerization. In this paper, literature on the modification of BMI by allyl compounds in recent years was reviewed. It includes allyl bisphenol A, allyl phenolic resin, allyl ether compounds, allyl phenoloxy resin and boron-containing compounds, aiming to provide reference and guidance for the modification of BMI resin. Reference | Related Articles | Metrics

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Rapid preparation and water resistance of PMMA/graphene oxide self-assembled composite films JIANG Duanyang, DING Guomin, XU Jianrong, CAI Yongqi, WANG Yao, MEI Qilin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 1-9.   DOI: 10.19936/j.cnki.2096-8000.20250728.001 Abstract （249）      PDF （13587KB）（352）       Knowledge map    Save Graphene oxide (GO) films have excellent selective permeability, but their low preparation efficiency and poor water resistance seriously affect their development and application. In order to improve the water resistance of GO films, a rapid preparation method of self-supporting hydrophobic polymer (PMMA)/GO composite films was proposed. Hydrophobic PMMA and hydrophilic GO were dispersed together by adjusting the proportion of ternary solvent (acetone-ethanol-water), and the dispersion mechanism was explained. In this method, the self-supporting composite film is formed rapidly by self-assembly at the gas-liquid interface by means of a volatile solvent system and a negative pressure assisted film forming method, and the shortest film forming time is only 6 s. The FTIR, XRD and SEM results of the composite films show that PMMA and GO are successfully combined and a dense lamination structure is formed. With the increase of PMMA content, the degree of interlayer regularity of the composite films first increases and then decreases. As the film-forming pressure increases, there is a corresponding decline in the film’s uniformity. The composite film exhibited a 44.39% increase in tensile strength due to the addition of PMMA and the exploitation of its structural uniqueness. The water resistance of the film is obviously enhanced, and the volume swelling rate is reduced by 98.11% compared with GO film. In this paper, a ternary solvent system is used to greatly improve the film formation property and film formation speed of GO, and the prepared composite film has good water resistance, which can greatly expand the application scenario of GO film. 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 （248）      PDF （6321KB）（396）       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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High-temperature high strain rate compression failure mechanism of plain weave CF/PEEK thermoplastic composite materials YU Xintao, ZHANG Fa, GAO Xin, ZHANG Xu, PAN Zhongxiang, CAO Miao COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (5): 1-14.   DOI: 10.19936/j.cnki.2096-8000.20250528.001 Abstract （243）      PDF （35909KB）（226）       Knowledge map    Save This paper proposed a method based on multiscale mechanics to predict the impact mechanical response and failure mechanism of plain weave CF/PEEK composite materials under high-temperature and high strain rate conditions. Firstly, finite element models at micro, meso, and macro scales were established based on the real geometric structure and spatial distribution of fibers, fiber bundles, and matrix in the composite materials. A micro-mechanical model was developed based on the typical spatial distribution of fibers within the solidified fiber bundles, and extended to the meso scale to predict the failure modes of fiber bundles under different loading conditions using periodic boundary conditions. Secondly, a meso scale plain weave structure unit cell model was established to obtain the mechanical properties of single-layer plates in the composite materials, and an equivalent connection between microstructure and macro scale performance was established. Finally, temperature field and dynamic compression performance parameters are tested, and a homogeneous model similar to macro specimens is created to verify the effectiveness of the model by comparing with experimental results. Meanwhile, the impact mechanical response and failure modes of the pre-tested specimens were analyzed to reveal the dynamic compression effects of plain weave CF/PEEK thermoplastic composite materials under coupled temperature field conditions. This study provides valuable reference for the safe service of thermoplastic composite materials in extreme environments. 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 （241）      PDF （15927KB）（457）       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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Connection performance and failure mechanisms of three-dimensional woven composites ZHANG Qian, ZHANG Yifan, ZOU Qi, ZHANG Peng, JIAO Yanan, AN Liuxu, LIU Yanfeng, ZHANG Daijun, HAO Junjie, CHEN Li COMPOSITES SCIENCE AND ENGINEERING    2024, 0 (9): 5-11.   DOI: 10.19936/j.cnki.2096-8000.20240928.001 Abstract （240）      PDF （12545KB）（330）       Knowledge map    Save In order to study the influence of fabric structures on the connection performance of three-dimensional woven composites, multi-layer multi-directional woven structure and layer-to-layer interlock woven structure composites were designed, and a macro-meso coupling analysis model of the open-hole connection structures was established to reveal the failure mechanism of 3D woven composite connections. The study shows that the proportion of ±45° yarn has an important effect on the extrusion strength of the mechanical connection of the composite material, and the introduction of ±45° yarns can improve the content of load-bearing yarns, which can effectively improve the stress concentration at the hole edge; the multi-layer multi-directional woven composites are mainly subjected to transverse and longitudinal damages of 0° yarn, 90° yarn, and bias yarns; these damages start at the hole edge and progressively spread symmetrically. The transmission direction of load and the propagation direction of damage show angular characteristics. Reference | Related Articles | Metrics

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Effects of the polyurethane sizing agent on surface and its interfacial properties for the aramid fiber DENG Zhikang, ZHANG Peng, KONG Haijuan, YU Muhuo COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (10): 22-27.   DOI: 10.19936/j.cnki.2096-8000.20251028.004 Abstract （236）      PDF （7462KB）（275）       Knowledge map    Save Waterborne polyurethane (WPU) sizing agent was used to modify aramid fiber (AF) and improve the interfacial bonding properties for AF and thermoplastic polyurethane (TPU) resin. The structure, surface element composition and morphology of AF were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy. The results showed that WPU sizing agent was successfully coated on the AF surface. The effects of WPU content on the surface energy, interlaminar shear strength of aramid fibers and TPU were studied. It is found can improve the surface roughness and surface energy of fiber surface with various WPU content. When the content of WPU sizing agent is 0.8wt%, the surface energy of WPU-AF is increased by 28.91%, while the interlaminar shear strength is 32.7 MPa, increased by 37.9%. Reference | Related Articles | Metrics

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Multi-scale analysis and research on special-shaped structure of plain weave composites GAO Han, SHANG Yan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (1): 1-6.   DOI: 10.19936/j.cnki.2096-8000.20250128.001 Abstract （235）      PDF （19926KB）（253）       Knowledge map    Save For the special-shaped structure of plain weave composites, the differences of multi-scale computational results obtained by two homogenization methods, including the stiffness spatial average method and uniform strain boundary condition method, are analyzed in the conditions of ply-direction tensile displacement loading and force loading. The results are compared with the reference results obtained using the whole mesoscopic model. Moreover, the influence of the number of partitions on multi-scale computational results is also analyzed. It is shown that the σy stress distribution trend of the two homogenization methods are consistent with same multi-scale model, and the results are in agreement with the fine model. In the displacement load, the maximum errors between the Mises/ σy of multi-scale results and the fine results are only 9.5% and 3.3%, and the errors decreased gradually with the increase of the number of partitions. However, the errors of the results in force loading are bigger, and it does not decrease with the increase of the number of partitions. And the results of uniform strain boundary condition are generally larger than the results of stiffness spatial averages. Finally, the partitioning method of multi-scale models will destroy some structural features and affect the multi-scale results to some extent. 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 （232）      PDF （5480KB）（450）       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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Research progress on multi-dimensional cross-classification system and engineering application of flexible composite pipes LI Qing, FAN Huan, XU Han, LI Ruiying COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 148-156.   DOI: 10.19936/j.cnki.2096-8000.20250828.018 Abstract （232）      PDF （4911KB）（382）       Knowledge map    Save Flexible composite pipes, as alternatives to traditional metal pipes, have attracted much attention in the fields of deep-sea oil and gas development and hydrogen energy transportation due to their advantages such as lightweight, corrosion resistance and high flexibility. This paper focuses on the material, structure and function of flexible composite pipes from a multi-dimensional cross perspective, and deeply analyzes the synergy mechanism among the three, aiming to provide a systematic reference for scientific research and practice in related fields. By sorting out the research trends of flexible composite pipes at home and abroad in recent years, this paper elaborates on the research progress from the classification system to the actual engineering application of flexible composite pipes, and at the same time makes prospects for the challenges and development directions it faces, in order to assist the continuous optimization and upgrading of infrastructure construction in the energy, chemical and other industries. Reference | Related Articles | Metrics

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Design and experimental study of carbon fiber composite multi-leaf springs for heavy truck suspension WANG Yi, HU Yefa, WANG Baokun, WU Shuihua, FU Kai, WEN Xianglong, ZHANG Jinguang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (8): 118-124.   DOI: 10.19936/j.cnki.2096-8000.20250828.014 Abstract （228）      PDF （6965KB）（392）       Knowledge map    Save This paper introduces carbon fiber reinforced plastic (CFRP) into the design of heavy truck leaf springs and propose a CFRP multi-leaf spring structure. Using finite element simulation analysis to coordinate and match the strength and stiffness of CFRP multi-leaf springs, which yields a lay-up angle of [0 33/±75] 5 for the CFRP single leaf spring, and optimize the simulation model by bench test, used ABAQUS software to establish the optimized finite element simulation model and CAE to predict the stiffness and fatigue life of CFRP multi-leaf springs under the conditions of working load, ultimate load and fatigue loading, and carry out reliability analysis of CFRP multi-leaf springs. Reliability analysis is carried out to predict the stiffness and fatigue life of CFRP multi-leaf springs, and bench tests are carried out on CFRP multi-leaf spring test pieces. The results show that the mass of the CFRP multi-leaf spring is 34.4 kg, achieving a weight reduction of over 45%. Additionally, the stiffness of the CFRP multi-leaf spring does not decrease after 150 000 cycles of cyclic loading, and it can still withstand a load of 20 tons without damage. Reference | Related Articles | Metrics

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Preparation of carbon fiber composite honeycomb structures and mechanical behavior of axial crush ZHU Hongwei, LIU Ke, ZHAO Changfang COMPOSITES SCIENCE AND ENGINEERING    2024, 0 (12): 5-11.   DOI: 10.19936/j.cnki.2096-8000.20241228.001 Abstract （227）      PDF （5579KB）（262）       Knowledge map    Save Carbon fiber reinforced composites (CFRP) have excellent mechanical properties, especially cushioning energy absorption properties. The structure type of the composite material products has a great influence on the mechanical properties, and a reasonable structural shape can better utilize the energy absorption and specific energy absorption potential of the composite material. The hexagonal column honeycomb structure of honey bees has been naturally selected to have good load-bearing stability. Bionic honeycomb structure, the periodic hexagonal cylinder honeycomb structure was prepared by assembling and bonding the single plates together, in which the single plate was obtained by vacuum hot-pressing method using T700 prepreg through a combination mold. The quasi-static impact experiments of the single plate were carried out by universal electronic material testing machine, and the progressive failure and delamination damage mechanisms were analyzed. To better simulate the impact failure behavior of the composite honeycomb structure, a damage mechanism that simultaneously considers both the intralaminar and interlaminar damage mechanisms of the CFRP laminate was proposed based on the continuum medium damage mechanics, and the incremental constitutive model in finite element form was developed, whose prediction results match well with the experimental results and verifies the feasibility of the finite element method. On this basis, simulations of the honeycomb structure were carried out to discuss the impact response of the honeycomb structure and analyze the failure modes and energy absorption effects under impact loading. The results of this paper demonstrate the stability and energy absorption characteristics of the honeycomb structure, which provides a reference for the design and application of CFRP structures in cushioning energy absorption engineering. Reference | Related Articles | Metrics

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Study on properties of high heat resistant and flame retardant epoxy resin matrix CFRP XIE Wenbo COMPOSITES SCIENCE AND ENGINEERING    2024, 0 (9): 43-47.   DOI: 10.19936/j.cnki.2096-8000.20240928.006 Abstract （225）      PDF （7076KB）（253）       Knowledge map    Save Mechanical, hydrothermal, flame retardant and fire protection performance of high heat resistant and flame retardant epoxy resin matrix CFRP is investigated in this article. The results show that the high heat resistant and flame retardant CFRP has great mechanical and flame retardant performance. The flame retardant epoxy resin matrix CFRP has achieved a flame retardant grade of V-0. Its maximum smoke density ( D m) within 240 seconds is 5.17, and its limiting oxygen index (LOI) is 39.5%. Therefore, this material can basically meet airworthiness standard. Above all, research on properties of structural and functional integrated CFRP lays a foundation for the final engineering application in advance aero-craft and aero-engine. 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 （225）      PDF （8299KB）（551）       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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Effect of corrosion environments on the secondary impact damage and residual compressive strength of carbon fiber composites CHEN Yanrong, WANG Xingyin, XU Liang, SUN Lin, WANG Xin COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 27-32.   DOI: 10.19936/j.cnki.2096-8000.20250728.004 Abstract （220）      PDF （8452KB）（385）       Knowledge map    Save The properties of carbon fiber composites depend largely on the environment in which they are used. The effects of three aging environments (distilled water, 10% sulfuric acid solution and sodium hydroxide solution) at the same temperature (70 ℃) on the secondary impact damage and residual compressive strength of T700 carbon fiber/epoxy resin matrix composites were studied. Fourier transform infrared spectroscopy (FTIR), the surface morphology before and after aging and the C-scan damage morphology were studied and analyzed. The results show that only physical damage occurs in the samples in distilled water and acid solution, and the changes of surface topography, C-scan damage morphology and residual compressive strength are related to the infiltration of water molecules. In alkali solution, the sample is seriously damaged, and the resin also has a chemical reaction. The properties of the material and the C-scan damage morphology have both effects on hygroscopicity and chemical damage of the resin. The research results are of great practical significance for improving the continuous service life and maintenance economy of these composite materials in complex environment. Reference | Related Articles | Metrics

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Lightweight design of carbon fiber composite/aluminum wheels KANG Yuanchun, YANG Jianhua COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (6): 94-100.   DOI: 10.19936/j.cnki.2096-8000.20250628.013 Abstract （220）      PDF （5148KB）（319）       Knowledge map    Save The lightweight design of the wheel hub was carried out, and the original aluminum alloy rim was replaced by carbon fiber composite material, and the optimization method using neural network as the surrogate model was adopted. Based on the isostiffness theory, the initial thickness of the carbon fiber composite rim was determined. Considering the influence of aluminum alloy spokes and carbon fiber rim thickness on their performance, Latin hypercube sampling was used to generate multiple groups of test samples. Based on the experimental samples, the neural network was used as a surrogate model to optimize the thickness of the spokes and the thickness of the carbon fiber layup at various angles of the rim. In order to obtain the best carbon fiber layup sequence, the carbon fiber rim layup sequence was further optimized in Optistruct. The resulting CFRP/aluminum hub is 18.43% lighter in weight and meets the requirements for stiffness and strength. 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 （218）      PDF （11826KB）（502）       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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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 （213）      PDF （9677KB）（473）       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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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 （211）      PDF （9138KB）（539）       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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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 （210）      PDF （7885KB）（465）       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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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 （209）      PDF （6058KB）（416）       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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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 （208）      PDF （7726KB）（432）       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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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 （208）      PDF （8324KB）（529）       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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Multi-objective optimization design of CFRP-Al bonded structures under multiple working conditions considering tensile and bending loads WU Wangjian, YOU Youpeng, ZHU Rupeng, WANG Dan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 79-90.   DOI: 10.19936/j.cnki.2096-8000.20250728.010 Abstract （207）      PDF （11392KB）（378）       Knowledge map    Save Due to the lack of systematic research on mechanical properties and damage behavior of the single lap bonded structures made of carbon fiber reinforced polymer composite (CFRP) and aluminum alloy (Al) under tensile and bending loads, the further improvement of the bonding properties and reliability is limited. In this study, the finite element model of CFRP-Al single lap bonded structure was established, and the mechanical response and damage distribution of the bonded structure under tensile load and three-point bending load were analyzed. Three-dimensional Hashin failure criterion and cohesive zone model were used to simulate the evolution process of intra-layer damage, interlayer damage and adhesive damage of CFRP, and the validity of the damage model was verified by comparison and analysis with experiments. Then, based on the bonding parameters, a multi-objective optimization proxy model with tensile strength, shear strength and bending strength as optimization objectives was constructed. The maximum relative error between the results of the proxy model and the simulation results was 2.57%, which verified the accuracy of the proxy model. On this basis, NSGA-Ⅱ algorithm was used to iteratively optimize the proxy model, and the three-dimensional distributed Pareto optimal solution set was obtained. Compared with the initial model, the optimized tensile strength, shear strength and bending strength of the bonded structure were increased by 7.34%, 24.12% and 9.51%, respectively, and the comprehensive connection performance of the bonded structure was effectively improved. This study provides a reference for reliability optimization design of bonded structures. Reference | Related Articles | Metrics

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Study on the structure and properties of unidirectional carbon fiber fabric composite materials with different stitch densities and layers QIN Cheng, ZHA Yibin, ZHANG Lianhe, REN Hao, CHENG Yanan, LI Yongfeng, LIU Yong, ZHANG Hui COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 11-19.   DOI: 10.19936/j.cnki.2096-8000.20250428.002 Abstract （207）      PDF （15644KB）（409）       Knowledge map    Save In order to investigate the structure and mechanical properties of stitched composite materials, aramid fibers were utilized as stitch threads and a modified lock stitching technique was employed to prepare unidirectional carbon fiber fabric preforms with different stitch densities and numbers of stitch layers. Composite materials were prepared by vacuum-assisted resin transfer molding (VARTM) process, and their internal structure as well as type Ⅰ interlaminar fracture toughness, impact performance, bending and compression properties were systematically investigated. The results show that the composite material exhibits the best comprehensive mechanical properties when stitched 9 layers at a density of 4 mm×4 mm. Compared with the unstitched composite material, the type Ⅰ fracture toughness increases by 50.8%, the maximum impact load increases by 46.2%, the energy absorption rate increases by 27.0%, the bending strength increases by 15.4%, the compressive strength increases by 4.1%, and the compressive modulus does not decrease. Conversely, for composite materials stitched with 3 layers at once, the bending and compression properties decrease with different stitch densities both decrease. After analysis, it is found that increasing the stitch density effectively enhance the interlayer performance of composite materials, while increasing the number of stitch layers help to reduce the impact of stitching on in-plane performance, providing important references for selecting stitching process parameters. Reference | Related Articles | Metrics

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Fatigue residual stiffness prediction model based on the degradation law of composite material properties YU Huan, SUN Pengwen, SUN Wenbo, DENG Hailong, WEN Yaoguang, ZHOU Wenming, DONG Jian, LIU Weichao COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (1): 23-28.   DOI: 10.19936/j.cnki.2096-8000.20250128.004 Abstract （205）      PDF （5611KB）（266）       Knowledge map    Save A composite fatigue residual stiffness prediction model is proposed to address the problem of incomplete consideration of influencing factors in the construction of existing residual stiffness prediction models, which simultaneously considers the combined effects of maximum stress, initial stiffness, critical residual stiffness, cycle life, and constant amplitude fatigue life. The results indicate that the proposed model conforms to the three-stage performance degradation law and can be used to describe the residual stiffness degradation of composite materials with high accuracy; the model exhibits higher prediction accuracy in the region of higher stress than that in the region of lower stress, which is related to the concentration of test data in the higher stress region; compared with existing model, the model proposed in this paper has high prediction accuracy and applicability for the fatigue residual stiffness of composite materials as a whole. Reference | Related Articles | Metrics

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Research progress of DIC on deformation and damage characterization of composite materials ZHAO Libin, YU Shaoyu, ZHANG Zheyi, HU Ning COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 148-160.   DOI: 10.19936/j.cnki.2096-8000.20250728.018 Abstract （205）      PDF （15608KB）（348）       Knowledge map    Save As a practical and effective tool for surface deformation measurement, digital image correlation (DIC) technology has been widely accepted and increasingly used to measure the deformation and damage behavior of composite materials. Composite materials have the properties of non-uniformity and anisotropy, which lead to complex deformation behaviors after being loaded. Traditional measurement techniques cannot accurately capture these behaviors due to various factors. As an advanced optical measurement technology and means, DIC has significant advantages in measuring the deformation behavior of composite materials. The principle of DIC and the factors that affect measurement accuracy are described in detail. Then, the application of DIC in deformation measurement and damage characterization of composite materials is mainly introduced. Finally, the possible development direction of DIC in the future is prospected. 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 （205）      PDF （12540KB）（429）       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