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Numerical simulations on the dynamic response of bionic-turtle-shell hierarchical sandwichstructures ZHANG Xiaogang, CUI Di, ZHANG Hao, SHA Yong COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 1-11.   DOI: 10.19936/j.cnki.2096-8000.20260728.001 Abstract （134）      PDF （9030KB）（200）       Knowledge map    Save To improve the protective performance of sports helmets against low-velocity concentrated impact loads, abionic-turtle-shellhierarchical sandwichstructure (BHSS) was designed in this paper. Numerical simulations were adopted to explore the dynamic response law of BHSS under impact loads, and the effects of carbon fiber lay-up angles, rubber buffer layer thickness, TPMS cell configurations and wall thickness on the punch acceleration response and structural energy absorption characteristics were systematically analyzed. The results show that under the action of 73.98 J impact energy, the dynamic process of punch penetrating BHSS can be divided into five stages: elastic deformation, damage initiation, damage aggravation, stiffness strengthening and rebound. The TPMS porous core layer is the core energy-absorbing component of BHSS, with an energy absorption ratio of 63.76% and an overall energy absorption peak value of 63.77 J for the structure. The carbon fiber lay-up angles of cross-ply, angle-ply and quasi-isotropic ply have a weak effect on the energy absorption peak value of BHSS. The rubber buffer layer can effectively reduce the peak impact acceleration, but with an obvious marginal effect. The BHSS with P-type cell configuration exhibits the optimal comprehensive buffering and energy-absorbing effect, while increasing the cell wall thickness will lead to a significant rise in the peak punch acceleration. Reference | Related Articles | Metrics

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Zoned gradient design and analysis of electromagnetic performance in curved functional composite structures YANG Shengshu, LI Songming, GUO Wen, LIU Yushun, LU Haijun COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 126-133.   DOI: 10.19936/j.cnki.2096-8000.20260728.015 Abstract （46）      PDF （8263KB）（137）       Knowledge map    Save This paper analyzes the potential reasons for the limited radar cross section (RCS) reduction effectiveness of gradient-designed electromagnetic functional composite materials, originally based on flat-plate structures, when applied to curved structures. By introducing a gradient design method for curved functional composite structures zoned by electromagnetic wave incidence angles, this study achieves optimized enhancement of dual-polarization electromagnetic performance in low-frequency bands for curved functional composite structures. The paper emphasizes that uniform gradient designs can improve RCS reduction capability in flat structures, but in curved structural applications, due to position-dependent variations in the actual electromagnetic wave incidence angles across curved surfaces, even under vertical electromagnetic wave irradiation, uniform gradient designs fail to directly deliver their electromagnetic scattering suppression optimization effects, necessitating gradient designs that incorporate incidence angle considerations to enhance RCS reduction capabilities. A gradient electrical structure design method partitioned by incidence angles is proposed. Through optimized analysis of curved functional composite structures with incidence angle-zoned gradient designs, an 8.94 dB improvement in average horizontal polarization RCS reduction at 1~2 GHz compared to single-type electromagnetic core materials is achieved, along with over 16 dB average RCS reduction across 1~6 GHz. A curved functional composite material structure has been obtained, which exhibits efficient low-frequency reduction performance in low-frequency horizontal polarization and also possesses vertical polarization reduction capabilities. Reference | Related Articles | Metrics

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A detection method for weak bonding defects at CFRP interfaces driven by dynamic response entropy WANG Tengao, QU Meijiao, SONG Yuheng, CHENG Danyang, LIU Yucheng COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 12-17.   DOI: 10.19936/j.cnki.2096-8000.20260728.002 Abstract （77）      PDF （6817KB）（159）       Knowledge map    Save To address the challenge of detecting weak bonding defects at interfaces in carbon fiber reinforced plastics (CFRP), a novel in-situ detection method driven by “dynamic response entropy” is proposed for laser shock testing. This approach employs a Photonic Doppler Velocimetry (PDV) system to record particle velocity responses on the rear surface of CFRP specimens subjected to laser shocks of varying energy and pulse width. Post-impact, computed tomography (CT) is employed to examine the internal state of the specimen. Findings reveal a significant correlation between the temporal disorder of the dynamic response signal during laser impact and the interfacial delamination behaviour induced by the shock wave. Building upon this, the degree of pattern disorder in the dynamic response signal’s time series is defined as “dynamic response entropy”, with entropy values characterising whether delamination occurs in the material under laser impact. Results indicate that non-delaminated specimens exhibit zero dynamic response entropy values, whereas delaminated specimens consistently display values significantly above zero. This confirms the efficacy of dynamic response entropy in characterising laser shock-induced interfacial delamination behaviour in CFRP, thereby providing a technical approach for detecting weak bonding defects at the CFRP interface under laser shock loading. Reference | Related Articles | Metrics

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Electromagnetic performance measurement technology of electromagnetic absorbing composites and structures QI Nan, YANG Kai, GUO Wen, LU Haijun COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 150-162.   DOI: 10.19936/j.cnki.2096-8000.20260728.018 Abstract （52）      PDF （1799KB）（149）       Knowledge map    Save Electromagnetic (EM) performance measurement technology, as the critical bridge to electromagnetic absorbing composites, plays an essential role in the revealing absorption mechanism, guiding material design and characterizing performance. The extensive adoption of EM absorbing composites in sophisticated sectors such as aviation, aerospace, and marine engineering has generated an increasingly urgent demand for high precision, stability, and engineering applicability. Therefore, it is necessary to systematically review the current research status, existing challenges, and future development trends. This paper, providing a comprehensive overview of EM performance measurement technology from the perspectives of electromagnetic parameters, absorption properties, and component performance, summarizes frontier achievements regarding measurement accuracy, operating bandwidths, and engineering viability and discusses the future development trends and application prospects. Reference | Related Articles | Metrics

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Properties of mesinase pitch modified ceramifiable silicone rubber composites and microanalysis of ablation layers WU Liwei, ZHAO Yangyang, LIU Xin, HUANG Zhixiong, WANG Yanbing COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 74-82.   DOI: 10.19936/j.cnki.2096-8000.20260728.009 Abstract （51）      PDF （12568KB）（118）       Knowledge map    Save The ceramifiable silicone rubber was prepared by blending with silicone rubber as the matrix, molybdenum silicide (MoSi 2) as ablation-resistant filler, a glassy material as low melting point filler, andmesophasepitch (MP) as ceramisation-assisting reactive substance. The tensile strength of the composites at room temperature, the flexural strength of the composites after high-temperature heat treatments at 600 ℃, 800 ℃, 1 000 ℃, and 1 200 ℃, and the microscopic morphology and phase evolution of the ablated centre region after oxygen-acetylene flame ablation were tested. The effects of MP content on the mechanical properties, high-temperature oxidation resistance and ablation resistance of the ceramicisable silicone rubber composites were investigated. The results showed that the flexural strength of the pyrolysis product of the composite with 20 parts of MP added reached 9.54 MPa after heat treatment at 1 200 ℃, which was 55.9% higher than that of the composite without MP added. The microscopic morphology shows that the addition of MP can effectively improve the densification of the carbon layer, and the surface of the composite material gradually becomes flat with the increase of MP content, and cracks and holes are basically not observed on the surface. Reference | Related Articles | Metrics

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Technical study on preparation of engine composite shell by inflatable bladder molding LI Shicheng, ZHOU Linyun, SHI Wenfeng, WANG Zhiyuan, LI Laifu COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 134-140.   DOI: 10.19936/j.cnki.2096-8000.20260728.016 Abstract （37）      PDF （7576KB）（128）       Knowledge map    Save In order to ensure the internal quality of the composite shell with both ends reduced, the method of lap spiral winding and inflatable bladder was used to prepare the composite shell. The bonding parameters were determined by testing the performance of the bonded inclined tape through experiments. The winding mode of the inclined tape was designed and the deformation of the inclined tape was calculated to determine the winding parameters. Different pressures were selected for experiments and tests, and the quality of samples was compared. The results show that the preferred bonding time of the inclined tape is 1 s, the bonding temperature is 80~90 ℃, the maximum deformation of the inclined tape is controlled at about 10 mm during winding, and the pressure of the bladder is 3 MPa, the internal quality of the prepared inner insulated shell is the best. Reference | Related Articles | Metrics

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Study on mechanical properties of composite pre-tightened toothed based on variable stiffness soft materials LI Fei, XU Wei, ZHAO Lieqiu, CHEN Weizhao COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 33-43.   DOI: 10.19936/j.cnki.2096-8000.20260728.005 Abstract （59）      PDF （14228KB）（128）       Knowledge map    Save The embedding of soft materials makes the load distribution among the teeth in the pre-tightened tooth joint of composite materials tend to be uniform, improving the bearing performance of the joint. However, it also leads to stress concentration at the tooth tip of a single tooth, which cannot fully utilize the performance of the soft material. Based on this, this paper proposes a single-tooth joint configuration with embedded variable stiffness soft materials. Through experiments and finite element models, the influence of constant stiffness and variable stiffness soft materials on the bearing capacity of single-tooth joints is compared and analyzed. The research results show that compared with the traditional single-tooth joint, embedding constant stiffness soft materials reduces the bearing capacity of the single-tooth joint by 54.4%, while embedding variable stiffness soft materials increases the bearing capacity of the single-tooth joint by 12.5%. Compared with constant stiffness soft materials, the embedding of variable stiffness soft materials can effectively reduce the stress concentration at the tooth tip of the composite material teeth, thereby improving the bearing performance of the joint. Reference | Related Articles | Metrics

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Study on the effect of porosity on flexural performance of thick composite structures for wind turbine blades HU Congli, WANG Xiaojing, DING Anxin COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 141-149.   DOI: 10.19936/j.cnki.2096-8000.20260728.017 Abstract （60）      PDF （8907KB）（125）       Knowledge map    Save The study investigated the effect of porosity on the flexural stiffness of thick composites used in wind turbines. Thick composite laminate test panels with porosities of 0.64%, 2.04%, and 5.42% were fabricated using vacuum infusion molding. Four-point bending specimens were prepared according to ISO 14125 standard, and cyclic bending fatigue tests up to 1 000 000 cycles were conducted. The flexural modulus of the specimens before fatigue testing and after 200 000,600 000, 800 000, and 1 000 000 cycles was calculated using strain gauge and deflection methods, respectively. Experimental results revealed that for high-porosity (5.42%) specimens, a significant discrepancy (61% higher modulus via strain method) existed between the two measurement approaches. This discrepancy arises because strain gauges only capture surface strain and fail to reflect the global load-bearing capacity of structures with internal defects such as interlaminar delamination. Porosity significantly influenced the degradation of flexural modulus in thick structures after fatigue. Low-porosity (0.64%) specimens exhibited a mere 3.7% modulus reduction from 52.18 GPa to 50.27 GPa after 1 000 000 cycles, whereas high-porosity (5.42%) specimens experienced a 38.4% modulus drop from 50.65 GPa to 31.21 GPa after 200 000 cycles, further declining to 28.90 GPa after 1 00 0 000 cycles. Finally, a porosity-dependent flexural modulus degradation model was established based on experimental data, providing critical support for mechanical simulation of thick composite shell structures under bending loads. Reference | Related Articles | Metrics

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Analysis of influencing characteristics of equivalent permeability of multilayer hybrid fiber composites LI Yongjing, XU Shengwen, YAN Shilin, ZHANG Xiaonan COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 66-73.   DOI: 10.19936/j.cnki.2096-8000.20260728.008 Abstract （52）      PDF （6680KB）（118）       Knowledge map    Save The comprehensive performance of hybrid fiber composites is significantly superior to that of single fiber composites. As a core parameter characterizing the impregnation ability of fibers, permeability directly affects the quality and mechanical properties of products. In this paper, a combined method of numerical simulation and experiment is adopted to study the equivalent permeability of hybrid fiber composites. A two-scale porous medium unit cell model considering the porosity within fiber bundles is established, and the reliability of this approach is validated by experimental findings. The influencing factors of fiber type, layering method, and nesting effect on the equivalent permeability of the unit cell are investigated. The results show that an increase in carbon fiber content in the unit cell significantly reduces the equivalent permeability of the unit cell; under different layering sequences, the low permeability layer inhibits fluid flow in the high permeability layer, thereby reducing the equivalent permeability of the unit cell; the nesting effect reduces the internal porosity of the fabric and increases the curvature of the flow channel, leading to a significant decrease in the equivalent permeability of the unit cell. Reference | Related Articles | Metrics

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Defect identification of plastic liner and carbon fiber layer of hydrogen storage cylinder based on microwave characteristics GUO Kai, BIAN Zhaopei, LING Xiao, NIU Jiang, YAO Yongchuang COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 93-99.   DOI: 10.19936/j.cnki.2096-8000.20260728.011 Abstract （43）      PDF （9525KB）（118）       Knowledge map    Save To realize the non-destructive detection of plastic liners and carbon fiber layers, microwave detection technology was used to conduct experimental research on prefabricated defective plastic sheets and carbon fiber samples. Firstly, carbon fiber samples with fourlayupangles were designed, and the plastic sheets and carbon fiber specimens were processed for defects. Then, the sample was tested by the microwave inspection system, and the defect evaluation and characterization were completed in combination with the detection data. The results show that the transmission parameter ( S 21) has the best stability and the highest fitting degree at 0° layup angles, and the microwave signal is the least interfered with, which is the most conducive to defect detection. In addition, defects can significantly change the microwave transmission, and different types of defects show unique changes in the S-parameters, which can be used for defect identification. This study provides a parameter optimization basis and a new approach for defect identification for the microwave non-destructive testing of hydrogen storage cylinder composite structures. Reference | Related Articles | Metrics

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Preparation and mechanical properties of titanium alloy and carbon nanocomposites WEN Hongzhe COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 18-23.   DOI: 10.19936/j.cnki.2096-8000.20260728.003 Abstract （87）      PDF （12426KB）（138）       Knowledge map    Save To investigate the effects of forming process and temperature environment on the mechanical propertiesof titanium alloy and carbon nanotube composite (CNTs/Ti),this study modifies the surface of the titanium alloy material with carbon nanotubes. The CNTs/Ti powder is prepared by the wet ball milling method, and the tensile specimens are prepared by the selective laser melting technology.Subsequently,the tensile mechanical properties ofCNTs/Ti are systematically studied underdifferent temperature environments.The results show that when the ball milling timeis 5 hours, the content of element C significantly increases to 22.78at%. At -58 ℃,the specimen with a CNTs content of 0.6wt‰ has the highest tensile strength. The trend under the low-temperature cycle is the same as that at low temperature (-58 ℃). At 600 ℃,the specimen with a CNTs content of 0wt‰ has the highest tensile strength.By observing the fracture surface of the specimens, it is found that the specimens still maintain high plasticity at-58 ℃ and 600 ℃. Reference | Related Articles | Metrics

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Research on the wave-absorbing performance of wave-absorbing honeycomb sandwich structures with damage CAO Huijie, SUN Yungang, XUAN Shanyong COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 83-92.   DOI: 10.19936/j.cnki.2096-8000.20260728.010 Abstract （52）      PDF （14774KB）（125）       Knowledge map    Save In practical applications, wave-absorbing honeycomb sandwich structures are prone to issues such as delamination, debonding, and impact damage of the wave-transmitting skin, which in turn affect their electromagnetic wave absorption performance. Based on an optimally designed wave-absorbing honeycomb sandwich structure, this paper establishes simulation analysis models incorporating different typical damages. It analyzes the impact of damage forms such as delamination of the wave-transmitting skin, skin-honeycomb debonding, and skin damage on the absorption performance. The applicability of the research results under different damage shapes, electromagnetic wave incidence angles, and polarization modes is verified. Finally, a theoretical model of wave-absorbing honeycomb sandwich structures with delamination, debonding, and skin damage is established, and the mechanism by which these damages affect the structural absorption performance is discussed in detail. The research results indicate that delamination and debonding damages have little impact on the absorption performance of the wave-absorbing honeycomb sandwich structure at low frequencies, and even enhance the absorption performance at high frequencies. When the damage diameter reaches 100 mm, the effective absorption bandwidth of the structure is reduced by up to 0.06 GHz; damage to the wave-transmitting skin disrupts the impedance matching characteristics of the structure, causing the absorption peak to shift towards higher frequencies, leading to a significant decrease in absorption performance at mid-to-high frequencies. When the damage diameter reaches 60 mm, the effective absorption bandwidth of the structure is reduced by 0.6 GHz, and the average reflectivity increases by 0.6 dB. Reference | Related Articles | Metrics

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Uncertainty analysis of tensile strength of open-hole laminates based on RVE modeling LI Enqing, LIU Xinglong, SONG Ting, LU Xiang COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 44-56.   DOI: 10.19936/j.cnki.2096-8000.20260728.006 Abstract （61）      PDF （10580KB）（116）       Knowledge map    Save Aiming at the problem of dispersion of mechanical properties of open-hole laminates due to fiber and pore inhomogeneity during material preparation, this study develops an algorithm for generating a three-phase RVE model with randomly distributed fibers-substrate-pores, performs macro- and fine-scale progressive damage analyses of open-hole laminates, and solves for the sensitivities of the dimensions of the fibers and pores ( R f, R v) and the volume fractions ( V f, V v) by using a polynomial chaos expansion method, to realize theuncertainty prediction of tensile strength of open-hole laminates.The analytical results show that under the combined effect of V f decrease and V v increase, the maximum decrease in the elastic performance parameters of the open pore plywood is 29.47%, and the ultimate load decrease is 14.51%, which are significantly more than the corresponding maximum decreases caused by the changes of a single parameter ( V f or V v) by 19.5% and 10.94%, respectively. For the failure displacements of open-hole laminates, the parameter influences were ranked as V f > R f > V v > R v; for the ultimate loads of open-hole laminates, the parameter influences were ranked as V v > V f > R v > R f. Which showed that the effects of the changes in volume fraction were greater than the effects of the changes in dimensions. Reference | Related Articles | Metrics

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Research on the bonding performance of BFRP bars and basalt fiber coal gangue concrete LI Kun, LIU Huaxin, LIU Zhenrong COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 57-65.   DOI: 10.19936/j.cnki.2096-8000.20260728.007 Abstract （44）      PDF （9996KB）（108）       Knowledge map    Save To investigate the bond performance between BFRP bars and spontaneous combustioncoal gangue aggregate concrete, a centralpull-out test was conducted to analyze the effects of the coal gangue fine aggregate replacement rate and basalt fiber volume fraction on interfacial bond behavior. The applicability of a typical bond-slip model was also evaluated. The experimental results show that the main interfacial failure modes between the BFRP bar and the coal gangue concrete are splitting failure and pull-out failure. An appropriate amount of coal gangue fine aggregate can significantly improve the interfacial bond performance. The peak bond strength reaches its maximum when the replacement rate is 25%, while further increases in the replacement rate lead to a decrease in bond performance due to the higher porosity of the aggregate. Basalt fibers have a significant reinforcing effect on interfacial properties; the bond strength initially increases and then decreases with increasing fiber volume fraction, with 0.15% being the optimal fraction. Model comparison results show that the CMR model can accurately describe the bond-slip relationship between the BFRP bar and the coal gangue aggregate concrete. This study can provide a reference for the resource utilization of coal gangue and the design of BFRP-reinforced concrete structures. Reference | Related Articles | Metrics

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Study of morphological structure and thermal conductivity of ultra-fine glass fiber wool felts MA Xiaoyong, WANG Shipeng, LI Gang, ZHAN Hao, LIN Xiaojun, ZHANG Yajuan, LI Gao COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 24-32.   DOI: 10.19936/j.cnki.2096-8000.20260728.004 Abstract （53）      PDF （15699KB）（109）       Knowledge map    Save Scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were employed to determine the morphological structure parameters of the two types of ultra-fine glass fiber wool felts, the impact of temperature variations on the thermal conductivity of both wool felts was investigated using transient plane source (TPS) method. The findings reveal that the wool felt No. 1 has a smaller average fiber diameter (3.36 μm), higher porosity (95.51%), larger total pore volume and area (0.013 2 m 3/kg and 1 270 m 2/kg, respectively); in contrast, the wool felt No. 2 has a larger average fiber diameter (6.27 μm), with porosity, total pore volume, and total pore area of 93.61%, 0.008 3 m 3/kg, and 669 m 2/kg, respectively. At a test temperature of 273.15 K, the average thermal conductivities of wool felts No.1 and No.2 are 0.025 7 W/(m·K) and 0.030 7 W/(m·K), respectively. As the test temperature increases, molecular thermal motion accelerates, resulting in an increasing trend in the thermal conductivity of both wool felts. At 393.15 K, the average thermalconductivities of wool felts No.1 and No.2 increase to 0.037 0 W/(m·K) and 0.043 3 W/(m·K), respectively. Additionally, due to its smaller fiber diameter, higher porosity, larger total pore volume and area, the wool felt No.1 consistently exhibits lower thermal conductivity and better thermal insulation performance than wool felt No.2. This study provides theoretical and data support for the application of ultra-fine glass fiber wool felts in engineering thermal insulation. Reference | Related Articles | Metrics

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Study on failure characteristics of multi-rivet joints in composite lap plates using blind rivets ZHANG Heng, DONG Weilin, XIONG Ruoqin, WANG Runze, YANG Chen, GENG Xiaoliang, LI Linsong, YANG Jin, LIU Jun COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 108-116.   DOI: 10.19936/j.cnki.2096-8000.20260728.013 Abstract （55）      PDF （10374KB）（103）       Knowledge map    Save This study investigated the load-bearing capacity of composite laminated lap joints with multi-rivet countersunk pull-through connections through single-shear multi-rivet tensile testing and simulation analysis, focusing on the effects of overlap height and rivet arrangement patterns. The experimental results showed that the primary failure modes were rivet shank fracture and localized damage in the laminate. The rivet fracture was caused by the shear action of the laminate, while the laminate damage originated from bearing stress around the rivet holes. The study found no significant positive correlation between overlap height and load-bearing capacity. Different arrangement patterns exhibited varying load-bearing capacities due to differences in rivet quantity, with parallel arrangements demonstrating higher capacity than staggered ones. Additionally, using T700 carbon fiber composite lap joints, despite their higher tensile strength, did not improve the load-bearing capacity of the multi-rivet connection structure. Instead, due to stress concentration and uneven load distribution, the T700 joints exhibited reduced capacity compared to T300 carbon fiber composite lap joints. Reference | Related Articles | Metrics

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Simulation study on lightning strike resistance performance of electric heating film for anti-ice andde-ice of wind turbine blades LU Jiaqi, JIANG Hui, CHEN Chao, TANG Shaochun COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 100-107.   DOI: 10.19936/j.cnki.2096-8000.20260728.012 Abstract （48）      PDF （10686KB）（106）       Knowledge map    Save Wind turbine blades are highly susceptible to icing when operating in low-temperature and high-humidity environments, which severely degrades their aerodynamic performance and significantly reduces power generation efficiency. Electric heating films have emerged as a key technology for wind turbine blade anti-icing/de-icing due to their advantages such as efficient ice melting, lightweight nature, and long lifespan. However, as a distributed conductive structure integrated onto the blade surface, electric heating films are more vulnerable to lightning strikes during thunderstorms. The transient high current and voltage can induce significant electrothermal coupling damage, making insufficient lightning resistance a critical factor affecting the reliability of wind turbine systems. Addressing the lightning resistance performance of wind turbine blade electric heating films, this paper employs the finite element analysis method to establish a detailed electrothermal coupling model. Based on this model, the electrothermal response characteristics of the electric heating film under different lightning currentwaveforms are simulated, and the influence of multi-layer protection structures on lightning resistance performance is comparatively analyzed. Research indicates that adopting a composite structure combining a high-density lightning protection copper mesh (195 g/m 2) with a resin reinforcement layer can significantly reduce electric field concentration and temperature gradients within the electric heating film during a lightning strike, thereby enhancing its ability to resist transient high voltage breakdown and thermal damage. This study provides an important theoretical basis and a technical reference for the structural optimization of anti-icing/de-icing electric heating films for wind turbine blades. Reference | Related Articles | Metrics

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Path planning for component contour inspection based on multi-objective optimization AN Tao, SUN Xiaowei, LIU Zhanwei, LIU Kai, LI Jianxi, WANG Xinghua COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (7): 117-125.   DOI: 10.19936/j.cnki.2096-8000.20260728.014 Abstract （44）      PDF （8826KB）（105）       Knowledge map    Save To address the issue of rapid profile inspection for large-scale complex components during various processing stages, this study develops a method for profile inspection path planning of target components under the constraints of a binocular laser measurement system. Based on the three-dimensional model of large-sized ship panels, the initial appearance data of the panels are obtained. Considering the geometric features of the components and the effective working range of the measurement system, the model is partitioned to establish an initial spatial viewpoint network for inspection paths. A non-dominated sorting genetic algorithm is employed for spatial search planning of the viewpoint network, where the constraints of the measurement system are incorporated as multi-objective optimization functions. The viewpoint coverage rate and quantity are set as optimization objectives to refine the viewpoint network. The optimized viewpoint network is then used as input, transforming the path optimization problem into a three-dimensional traveling salesman problem. An improved ant colonyalgorithm is applied to optimize the path traversing all viewpoints, with a cost function introduced to evaluate the optimized paths. Through experimental verification, a large-sized component profile inspection path planning method with short measurement paths, low time consumption, and high model coverage is ultimately developed. Reference | Related Articles | Metrics

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Design and analysis of 30 kg composite tiltrotor VTOL fixed wing UAV LIU Feng, WEI Zhenpeng, MAO Jiayuan COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (7): 115-122.   DOI: 10.19936/j.cnki.2096-8000.20250728.014 Abstract （370）      PDF （6210KB）（493）       Knowledge map    Save A multi-role, long-endurance, vertical takeoff and landing tiltrotor composite fixed-wing UAV is designed. Maximum takeoff weight is 30 kg, and extended duration of flight is over 24 hours. Conceptual design, aerodynamic analysis and structure design of the UAV are completed. Static loading test of middle wing section is carried out, which is compared with numerical analysis data. Based on finite element analysis, the strength, stiffness and stability of the airframe are checked. Hashin failure criterion is used to determine the damage of carbon fiber panel and balsa wood core of composite sandwich structure, carbon fiber skin is also checked. Wing skin laminate design is optimized, and structure performance is assessed. It is showed that climbing by 2.5 g load with pay load below the fuselage is the severest load case. High stress state is found in the center aera of the middle wing. Buckling tends to occur firstly at the upper skin of the middle wing. Initial structure damage mode is compression damage of balsa core. Performance requirements with excessive load margin is satisfied by initial composite laminate layup. Wing skin laminate layup is optimized by sub-region semi equi-strength design. Weight of the wing is reduced by 1.51 kg, about 17% decrease. Wing load margin is reduced to 0.13 which shows outstanding improvement of structure loading efficiency. The endurance of the UAV is estimatedby energy consumption relationship. Reference | Related Articles | Metrics

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

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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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SiC f/SiC composite materials:SiC fibers, preparation techniques and application progress in aero-engines JIAO Chunrong, JIAO Jian COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (12): 131-137.   DOI: 10.19936/j.cnki.2096-8000.20251228.017 Abstract （181）      PDF （2466KB）（262）       Knowledge map    Save SiC f/SiC composite materials exhibit characteristics such as lightweight, low density, excellent high-temperature stability, superior mechanical properties, outstanding chemical stability, and high wear resistance, making them ideal for hot-section components in aero-engines. This paper primarily introduces the current development status of SiC fibers, the fabrication processes and properties of SiC f/SiC composites, and the application progress of SiC f/SiC composites in aero-engines. It further analyzes the challenges currently faced in the development of SiC f/SiC composites and proposes key priorities for their future advancement. Reference | Related Articles | Metrics

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STUDY OF THE CFRP CYLINDER UNDER EXTERNAL HYDROSTATIC PRESSURE XIAO Wen-Gang, WANG Rong, QIAO Ren-Hai Fiber Reinforced Plastics/Composites    2009, 209 (4): 11-13.   Abstract （3429）      PDF （317KB）（2155）       Knowledge map    Save A general design methodology was presented for CFRP cylinder for deep ocean applications under external hydrostatic pressure.  The formula method and FEA  were comparable with the experimental results. Reference | Related Articles | Metrics

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Gradient design and ballistic performance of hybrid fiber composites ZHANG Huihui, QIN Bin, DONG Fangdong COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (10): 28-33.   DOI: 10.19936/j.cnki.2096-8000.20251028.005 Abstract （212）      PDF （7645KB）（314）       Knowledge map    Save This study investigated the influence of gradient design on the ballistic performance of aramid fiber and ultra-high molecular weight polyethylene (UHMWPE) fiber hybrid composites. Five gradient schemes with varying UHMWPE content (corresponding to 0, 10, 20, 30 and 40 layers) were designed, with the total areal density strictly controlled below (6±0.05) kg/m 2 for all configurations. Ballistic tests were conducted, utilizing both aramid and UHMWPE as the impact faces, to systematically analyze the effects of fiber content and stacking sequence on the ballistic limit velocity V 50 and ballistic performance index (BPI) of the laminates. Based on the experimental data, a cubic nonlinear regression quantitative relationship model ( R 2>99%) between fiber content and ballistic performance is established,which provides a scientific basis for the gradient design of hybrid fiber composites and the development of ballistic protection equipment. Reference | Related Articles | Metrics

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Research advances in high performance epoxy resin adhesives ZHAO Yan, MU Xuesong, CHEN Wengang COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (6): 159-168.   DOI: 10.19936/j.cnki.2096-8000.20260628.018 Abstract （108）      PDF （994KB）（140）       Knowledge map    Save With the development of modern industrial technology, the requirements for material performance are continuously increasing. The aviation manufacturing sector urgently needs to continuously optimize the comprehensive performance of epoxy adhesives under complex working conditions, to overcome the key technologies of bonding and sealing in aircraft honeycomb sandwich structures, thereby promoting the collaborative innovation of lightweight and reliability in China’s aviation industry. This paper reviews the practical applications and research progress of epoxy resin adhesives, emphasizing the influencing factors of the thermal resistance performance of epoxy adhesives and the technical methods to improve their thermal resistance, as well as providing a detailed explanation of the toughening mechanism of epoxy resins. 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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Research on the winding process of the engine casing retaining ring YANG Fei, ZHU Guang, SUN Yu, GUO Jin, GAO Haiyuan, ZHENG Yaping, LIU Weiwei COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (2): 97-103.   DOI: 10.19936/j.cnki.2096-8000.20260228.014 Abstract （147）      PDF （4855KB）（368）       Knowledge map    Save In this paper, the hot-melt method was used to prepare aramid/epoxy prepreg 023F/DBE-125 and fiberglass/epoxy prepreg SW280F/DBE-125. Composite material test plates were made using the autoclave process, and their mechanical properties and ballistic impact resistance were characterized. To address the deformation issues encountered during the winding, curing, and processing of the thin-walled engine casing, the mold and the assembly gap of the casing, along with the material’s thermal expansion differences, were used as the design basis for the winding mold of the engine casing retaining ring. Through simulation technology and process trials, suitable winding and processing parameters were determined. Using the parameters obtained from the trial pieces, composite retaining rings were wound onto thin-walled engine casings, and the formed retaining rings were subjected to dimensional and internal quality inspection. The test results show that the performance indicators of the developed engine casing retaining ring meet the required standards. This study provides an important reference for the lightweight design and manufacturing of engine casings and has significant implications for the development of key components in aircraft engines. Reference | Related Articles | Metrics

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Study on the interface properties of Kevlar fiber/graphene oxide hybrid toughened GFRP-Balsa sandwich structure CAI Yuzhi, SHI Huiyuan, TANG Baijian, XU Ziheng COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (6): 10-19.   DOI: 10.19936/j.cnki.2096-8000.20260628.002 Abstract （87）      PDF （18755KB）（131）       Knowledge map    Save The study focused on GFRP-Balsa sandwich structures, conducting three-point bending tests on a total of 9 specimens of three types of sandwich beams: non-toughened, Kevlar short fiber toughened, and Kevlar short fiber combined with graphene oxide hybrid toughened. By analyzing the interfacial delamination morphology, crack propagation patterns, and strain energy release rates of the GFRP-Balsa sandwich structures, the toughening mechanisms of different methods were elucidated. Experimental results demonstrated that, compared to non-toughened specimens, the hybrid toughened specimens exhibited a 25.96% increase in critical delamination load and a 92.4% enhancement in average strain energy release rate, indicating that the hybrid toughening method significantly improves the interfacial toughness of GFRP-Balsa sandwich structures. Scanning electron microscopy images and experimental data revealed that the toughening mechanism of Kevlar fibers involves the formation of composite fiber bridging structures, while graphene oxide modifies the resin, enabling it to tightly encapsulate the hybrid fibers, thereby increasing the difficulty of interfacial delamination. Reference | Related Articles | Metrics

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Room temperature uniaxial tensile and internal pressure burst testing of SiC/SiC composite claddings WANG Weijun, ZHANG Huafeng, FENG Zongyue, XU Bo, CHEN Ran, KONG Shuyan, ZHENG Gang COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (12): 20-25.   DOI: 10.19936/j.cnki.2096-8000.20251228.003 Abstract （120）      PDF （5842KB）（223）       Knowledge map    Save SiC/SiC composites represent one of the primary long-term objectives for accident-tolerant fuel cladding in pressurized water reactor (PWR) nuclear power plants. To establish relevant testing capabilities and acquire phased mechanical property data, shortened specimens extracted from meter-length tubular materials were employed to conduct axial tensile and internal pressure burst tests on SiC/SiC composite cladding tubes at ambient temperature. Experimental results demonstrate that the SiC/SiC composite cladding tubes exhibit similar “quasi-plastic” stress-strain behavior under both stress states, characterized by progressive failure mechanisms. The tubes fabricated with 45° fiber orientation relative to the tube axis demonstrate comparable axial and hoop strengths, achieving the objective of balanced mechanical properties in both directions. Mechanical property testing of parallel samples from different production batches shows acceptably small variations, indicating that the current manufacturing process can reliably produce meter-length tubes with satisfactory uniformity in axial mechanical properties. Reference | Related Articles | Metrics

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Research progress of pultrusion process for carbon fiber reinforced polymer composites HU Yujie , ZENG Yonghong , LIU Yonghong , SUN Lin , ZHANG Lianhe , ZHU Hongqiang , LU Wenfeng , CAI Yadi , ZHU Minjiang , ZHOU Zewen , ZHANG Hui COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (4): 144-160.   DOI: 10.19936/j.cnki.2096-8000.20260428.018 Abstract （99）      PDF （29155KB）（118）       Knowledge map    Save Pultrusion process possesses unique advantages in the production of carbon fiber reinforced polymer (CFRP) due to its high productivity, high raw material utilization, and outstanding designability. It is widely used in various fields such as wind turbo blade and aeronautics. This paper reviews the pultrusion application status. Since resin plays the role of matrix materials of CFRP, we discuss in detailthe pultrusion related to the classification of thermosetting resin and thermoplastic resin. Thermosetting resin possesses low viscosity, low molding temperature and a series of advantages, including epoxy resin, polyester resin. The most obvious characteristic of thermoplastic resin is recyclability, but the high viscosity and high molding temperature restrict its application. The specific cross section structures of CFRP can be fabricatedcorresponding to the advantageous of pultrusion, for example, linear, rounded and H-shaped profiles and other shaped profiles could be quantity produced using pultrusion. We further clarified the specific production process and corresponding optimization design scheme, including fiber arrangement, fiber impregnation, curing molding, described the test methods and evaluation of pultruded composite, including tensile strength, bending strength, interlaminar fracture toughness related to mechanical properties, and C-scan related to nondestructive testing. Finally, we discussed CFRP recycling, the existing problems of pultrusion process in CFRP and expected the future development trend. 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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Shear nonlinear behavior of laminated composite materials: experimental and numerical simulation study MA Mingze , XIONG Xin , MENG Qingchun , WU Fuqiang , ZHAO Yapan , QIAO Wei COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (4): 27-35.   DOI: 10.19936/j.cnki.2096-8000.20260428.004 Abstract （71）      PDF （8129KB）（92）       Knowledge map    Save Composite materials exhibit significant nonlinear behavior in longitudinal and transverse shear stress. The experimental and numerical simulation studies on the shear nonlinear phenomenon of carbon fiber and glass fiber woven composite materials are conducted in this paper. A constitutive equation similar to plastic damage is used to describe the shear nonlinear constitutive behavior of composite materials, taking into account the influence of plastic strain on residual deformation. By comparing with the experimental results, it is found that the model in this paper can accurately describe the load displacement curve, damage distribution, and failure morphology of woven composite materials, verifying the accuracy of the proposed model. Reference | Related Articles | Metrics

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Effect of carbon fiber tow tensile specimen preparation process on measured tensile strength MA Chu, FENG Xiaowei, CUI Yu, WANG Xueming COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (5): 48-53.   DOI: 10.19936/j.cnki.2096-8000.20260528.007 Abstract （66）      PDF （4908KB）（61）       Knowledge map    Save Using seven types of carbon fibers as the research subjects, this study investigated the influence of specimen preparation on the tensile strength test values by varying the tension, curing degree, and resin content during the preparation of carbon fiber tows tensile specimens. The results showed that tensile strength values are significantly influenced by applied tension during preparation. The optimal tension exhibits negligible dependence on tow strength grade but correlates strongly with tow size, increasing proportionally with larger tows. Maximum tensile strength is achieved at a curing degree of 94% and resin content maintained between 40% and 45%. Reference | Related Articles | Metrics

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EFFECT OF CURING AGENT CONTENT ON RTM EPOXY SYSTEM CURING PROPERTIES Chai, H M., Wang, P., Wang, L., Sun, C. M. Fiber Reinforced Plastics/Composites    2009, 205 (6): 48-49.   Abstract （2621）            Knowledge map    Save In this paper， the RTM epoxy system had been synthesized by modifying Bisphenol A epoxy and adding a kind of amine curing agent. The effect of curing agent content on the performance of epoxy system were studied by DMA and mechanical testing machine. The results showed that， the glass transition temperature was low whenever curing agent content was higher or lower，but when the ratio of epoxy and curing agent was 100∶31， the maximum glass transition temperature of the system was about 92.4℃， and the mechanical properties of the system were good. 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）（284）       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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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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Application prospects of thermoplastic composites in automotive lightweighting YAO Lichao, WANG Shuxia, LI Yiquan, MAO Yasai COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (12): 138-144.   DOI: 10.19936/j.cnki.2096-8000.20251228.018 Abstract （185）      PDF （4525KB）（169）       Knowledge map    Save In response to the growing demand for automotive lightweighting, thermoplastic composites have demonstrated broad application potential in the automotive industry due to their excellent mechanical properties, low-density characteristics, and favorable processing adaptability. This article reviews the practical applications of thermoplastic composites in automotive structural components, interior trim parts, exterior panels, and load-bearing components. Meanwhile, to address current challenges such as high costs, complex forming processes, and immature recycling technologies, feasible engineering solutions are proposed. With advancements in polymer material modification technologies and intelligent manufacturing, thermoplastic composites will play an increasingly important role in automotive lightweighting, driving the transformation and upgrading of the automotive industry toward green and low-carbon development. Reference | Related Articles | Metrics

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Research on the prediction of compression buckling behavior of composite I-shaped reinforced plates based on machine learning YANG Xinyi , NIE Xiaohua , ZHANG Guofan , CHANG Liang COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (4): 78-88.   DOI: 10.19936/j.cnki.2096-8000.20260428.010 Abstract （71）      PDF （13938KB）（82）       Knowledge map    Save The I-beam composite stiffened panel is a common engineering structure in aircraft load-bearing components. The axial compressive buckling performance of such panels is typically investigated using engineering methods and finite element analysis. However, these conventional approaches are characterized by low accuracy and high computational time, making it difficult to achieve efficient and precise research. In this study, an efficient machine learning framework is established to address the prediction of the buckling load and buckling mode shape of I-beam composite stiffened panels under axial compression. By designing the sample space and constructing the dataset, the Extra Tree regression model and ANN (Artificial Neural Network) classification model are selected for prediction. The prediction accuracy for buckling load and mode shape reaches 98.34% and 93.75%, respectively. This significantly improves the prediction accuracy and efficiency, thereby overcoming the limitations of traditional methods. Reference | Related Articles | Metrics

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Mechanical properties test and failure mechanism analysis of pultruded carbon fiber reinforced composite LI Yixuan, REN Hongliang, LIU Weisheng, LI Chengliang, HUANG Huixiu, LI Chuang, LI Yongfeng, ZHANG Hui COMPOSITES SCIENCE AND ENGINEERING    2026, 0 (6): 20-27.   DOI: 10.19936/j.cnki.2096-8000.20260628.003 Abstract （93）      PDF （15632KB）（209）       Knowledge map    Save This study investigates the mechanical behavior of pultruded carbon fiber-reinforced thermosetting resin matrix composites(pultruded CFRP) under complex loading conditions. Through a series of mechanical tests combined with digital image correlation(DIC) and scanning electron microscopy(SEM), the failure mechanisms were elucidated. A three-dimensional solid element model incorporating the 3D Hashin failure criterion was employed to predict the strain field and mechanical response of pultruded CFRP under open-hole tension. The results indicate that the material exhibits significant anisotropic failure behavior under different loading directions. Both longitudinal tensile and compressive properties are markedly superior to their transverse counterparts, primarily due to the direction-dependent failure modes in pultruded composites. Under longitudinal tension, failure is dominated by fiber-matrix interfacial debonding, triggering stress redistribution and subsequent fiber brittle fracture, whereas transverse tension failure is governed by matrix-dominated fracture accompanied by interfacial debonding. Under compressive loading, longitudinal failure originates from fiber micro-buckling, while transverse failure is characterized by matrix shear yielding-induced interfacial debonding and localized fiber yielding. Since the fracture and yielding loads of fibers are substantially higher than those of the matrix, the longitudinal mechanical properties significantly outperform the transverse properties. In shear failure mode, the composite exhibits multiple crack propagation features, initiated by horizontal matrix cracks near the notch, which develop into multiple parallel matrix cracks along the fiber direction, ultimately leading to global failure. Additionally, the open-hole tensile strength reaches 1 246.83 MPa, demonstrating a typical fiber-matrix interfacial longitudinal splitting failure induced by hole-edge stress concentration. Numerical simulation of open-hole tension predicted the material’s failure mechanism with a deviation of 11.06%. Finally, a comparative analysis between DIC and conventional strain gauge measurements revealed discrepancies of less than 4% at all stress levels, validating the reliability of the DIC-derived full-field strain maps and stress-strain curves. This study systematically analyzes the failure mechanismsof pultruded CFRP through multiple fundamental mechanical tests, providing a theoretical basis for structural design and failure assessment under complex loading conditions. Reference | Related Articles | Metrics

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Lightweight design and optimization of CFRP material mining helmet SHI Linxin, WANG Haijun, WANG Honglei COMPOSITES SCIENCE AND ENGINEERING    2025, 0 (4): 125-134.   DOI: 10.19936/j.cnki.2096-8000.20250428.016 Abstract （135）      PDF （10264KB）（471）       Knowledge map    Save In order to solve the problem of excessive weight of the mining helmet, carbon fiber reinforced composite (CFRP) material was devised to substitute for the conventional ABS plastic to realize the lightweight design of the mining helmet. The finite element model of steel ball-helmet for collision simulation was established. The mechanical properties of ABS and CFRP helmet shell were compared and analyzed in simulation. The strength and stiffness of CFRP helmet shell are superior to ABS casings, and have better protective properties. The input-output relationship between CFRP lamination parameters and helmet mechanical properties was simulated by BP neural network. And the global optimization of helmet mechanical properties was realized by particle swarm optimization algorithm. The optimization results indicate that the optimal lamination parameters consist ofa total number of 6 layers of CFRP, with each layer having a thickness of 0.2 mm and arranged in the following angle sequence . The collision simulation results show that the optimized CFRP helmet’s top experiences a maximum deformation of 19.601 mm, while the headform endures a maximum force of 4.891 kN. The optimization configuration can meet the requirements of relevant national standards and achieve a lightweight design with 49.3% weight reduction compared with the ABS helmet shell. Reference | Related Articles | Metrics