Composites Communications最新文献_第6页

Structure design of polyetheretherketone composites for efficient electromagnetic interference shielding with low reflection and stability in severe environment 恶劣环境下低反射、高效屏蔽电磁干扰的聚醚醚酮复合材料结构设计

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-18 DOI: 10.1016/j.coco.2025.102674

Liubo Liang, Yu Bai, Xiaohan Mei, Yanchao Yang, Guibin Wang, Shuling Zhang, Jianxin Mu

With the evolution of information technology, the demand for absorption-dominant electromagnetic interference (EMI) shielding materials is growing. The gradient-structured polyetheretherketone (PEEK) composites with high-efficiency shielding performance and low reflection were successfully prepared through integrated design combining physical coating, hot pressing, and surface metallization. Precise modification of multi-walled carbon nanotubes (MWCNT) with PEEK significantly improved their dispersion and compatibility as conductive filler in the resin matrix without compromising conductivity. The gradient structure constructed around the conductivity percolation threshold (0.62 vol%) achieved shielding characteristics dominated by absorption. Surface metallization further enhanced the conductivity gradient, thereby simultaneously improing microwave shielding and absorption capability. Under the synergistic attenuation mechanism of “low reflection-absorption-high reflection-reabsorption”, multi-layer PEEK@MWCNT/PEEK/Ni (m-PMPN) composites exhibited efficient EMI shielding effectiveness of >65 dB (99.99997 % shielding efficiency) with a reflectivity of only 21 %, effectively mitigating secondary electromagnetic radiation pollution. More importantly, the superior EMI shielding performance of m-PMPN composite can be maintained even under severe environment, including immersion in corrosive media and high-temperature treatment. Additionally, m-PMPN composites demonstrated excellent thermal stability (5 % weight loss temperature of 565 °C) and mechanical properties (tensile strength of 116 MPa). Therefore, the multi-layer gradient structure design based on the conductivity percolation threshold provides a novel strategy for developing structure function integrated polymer-based composites with low reflection and high EMI shielding effectiveness, making them promising candidates for electromagnetic protection in next-generation electronics.

随着信息技术的发展，对吸波型电磁干扰屏蔽材料的需求日益增长。通过物理涂层、热压和表面金属化相结合的一体化设计，成功制备了具有高效屏蔽性能和低反射性能的梯度结构聚醚醚酮（PEEK）复合材料。用PEEK对多壁碳纳米管（MWCNT）进行精确改性，显著改善了其作为导电填料在树脂基体中的分散性和相容性，同时又不影响其导电性。在电导率渗透阈值（0.62 vol%）附近构建的梯度结构实现了以吸收为主的屏蔽特性。表面金属化进一步增强了导电梯度，从而同时提高了微波屏蔽和吸收能力。在“低反射-吸收-高反射-重吸收”的协同衰减机制下，PEEK@MWCNT/PEEK/Ni （m-PMPN）多层复合材料对EMI的屏蔽效率高达65 dB（屏蔽效率为99.99997%），反射率仅为21%，有效地减轻了二次电磁辐射污染。更重要的是，即使在腐蚀性介质浸泡和高温处理等恶劣环境下，m-PMPN复合材料也能保持优越的EMI屏蔽性能。此外，m-PMPN复合材料表现出优异的热稳定性（565℃时失重5%）和机械性能（抗拉强度116 MPa）。因此，基于电导率渗透阈值的多层梯度结构设计为开发具有低反射和高EMI屏蔽效能的结构功能集成聚合物基复合材料提供了一种新的策略，使其成为下一代电子产品电磁保护的有希望的候选者。

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引用次数: 0

Correction of fluidity measurement errors and gradient-difference mechanism analysis for high water–cement ratio bentonite–cement grouts 高水灰比膨润土-水泥浆液流动性测量误差校正及梯度差机理分析

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-11 DOI: 10.1016/j.coco.2025.102675

Tao Zhu , Chenghua Shi , Keyue Zheng , Zixu Zhu , Zhu Peng , Huitao Shen , Xiaoliang Liu

This study investigates the fluid diffusion and rheological behavior of high water–cement ratio cement grouts with varying bentonite contents. Using a self-developed Cement Flow Analyzer, high-precision identification and equivalent computation of irregular liquid surfaces were achieved, overcoming errors in traditional diameter-based methods. Results show that, without image recognition, using the mean of the maximum and perpendicular diameters significantly reduces fluidity calculation errors. The pixel-based statistical approach derived from image recognition yields superior accuracy by directly determining irregular surface areas. Fitting analyses reveal that the area–diameter relationship follows a Hill-type saturation function: the ideal circular approximation suits near-saturation ranges, while a geometric square relation better balances simplicity and accuracy at medium-to-high water–cement ratios. Rheological tests indicate that increasing the water–cement ratio from 0.8 to 1.0 transforms the grout from a dense flocculated to a diluted state, reducing yield stress and enhancing shear-thinning behavior. Bentonite addition reconstructs the particle skeleton, increases cohesion, and lessens the sensitivity of yield stress estimation. Microscopically, low bentonite contents cause porous, unstable structures, whereas higher levels induce swelling, chemical interactions, and physical bridging, partially restoring strength. This study refines fluidity measurement, clarifies non-monotonic rheological modulation by water–cement ratio and bentonite content, and offers theoretical and practical guidance for grout design under complex geological conditions.

研究了不同膨润土含量的高水灰比水泥浆料的流体扩散和流变特性。利用自主研制的水泥流动分析仪，克服了传统基于直径的方法的误差，实现了不规则液面的高精度识别和等效计算。结果表明，在没有图像识别的情况下，使用最大直径和垂直直径的平均值可以显著降低流动性计算误差。基于像素的统计方法来源于图像识别，通过直接确定不规则的表面区域，产生了优越的精度。拟合分析表明，面积-直径关系遵循hill型饱和函数：理想的圆形近似适用于接近饱和的范围，而几何方形关系更好地平衡了中高水灰比的简便性和准确性。流变试验表明，水灰比从0.8提高到1.0，使浆液从致密絮凝状态转变为稀释状态，降低了屈服应力，增强了剪切减薄特性。膨润土的加入重建了颗粒骨架，增加了黏聚力，降低了屈服应力估计的敏感性。从微观上看，低膨润土含量会导致多孔、不稳定的结构，而高膨润土含量会导致膨胀、化学相互作用和物理桥接，从而部分恢复强度。该研究细化了流动性测量，阐明了水灰比和膨润土含量对非单调流变的调节作用，为复杂地质条件下的注浆设计提供了理论和实践指导。

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引用次数: 0

Impact-resistant bioinspired curved interlayers panel from durian thorns: design and impact dynamics 由榴莲刺制成的抗冲击仿生弯曲夹层面板：设计和冲击动力学

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-13 DOI: 10.1016/j.coco.2025.102681

Hongkai Li , Junliang Chen , Huaiying Wang , Laishou Song , Min Yu

In recent years, the need to optimize personal protective equipment (PPE) has become increasingly urgent with the continuous improvement of weapon lethality. As key components of PPE, inserts and ballistic helmets rely on ballistic materials to mitigate impact damage. When ballistic materials intercept high-speed impacts, the resulting back face deformation (BFD) can cause blunt trauma, which poses a major safety threat. High impact resistance performance and lightweight are key properties for PPE. Drawing inspiration from the biological structure of durian thorns, a novel interlayer structure with arranged protrusions is proposed that combines SiC ceramics and UHMWPE. The finite element analysis (FEA) was employed to simulate the impact of interlayer quantity and key dimensional parameters on its ballistic performance. The simulation results demonstrate that the three interlayers structure reduces the BFD by 22.3 % and the peak contact force by 41.5 % compared to the typical panel. The buffering effect is achieved by prolonging the projectile's interaction time with the panel, thereby reducing the peak load. Furthermore, it significantly improves the impact resistance of the proposed protrusion interlayer structure by increasing the protrusion height (H) within the specific dimension combinations of the side length of the square base (L) and the diameter of the protrusion (D). Among these sets, those with the specific dimension combination of L-D-H with 6-5-3 exhibited the lowest BFD, which was 21.8 % lower than the typical panel. This suggests that higher curvature and denser surface distribution mitigate stress concentration.

近年来，随着武器杀伤力的不断提高，对个人防护装备（PPE）的优化需求日益迫切。作为PPE的关键部件，镶件和弹道头盔依靠弹道材料来减轻冲击损伤。当弹道材料拦截高速撞击时，所产生的背面变形（BFD）会造成钝性创伤，对安全构成重大威胁。高抗冲击性能和轻量化是PPE的关键特性。从榴莲刺的生物结构中获得灵感，提出了一种将碳化硅陶瓷和超高分子量聚乙烯相结合的具有排列突起的新型层间结构。采用有限元分析方法模拟了夹层数量和关键尺寸参数对其弹道性能的影响。仿真结果表明，与典型面板相比，三层夹层结构使BFD降低22.3%，峰值接触力降低41.5%。缓冲效果是通过延长弹丸与面板的相互作用时间，从而降低峰值载荷来实现的。此外，在方基边长(L)和凸点直径(D)的特定尺寸组合范围内，通过增加凸点高度(H)，显著提高了所提出的凸点层间结构的抗冲击性。其中，L-D-H与6-5-3特定尺寸组合组的BFD值最低，比典型面板低21.8%。这表明更高的曲率和更密集的表面分布减轻了应力集中。

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引用次数: 0

Graphene nanoplatelet reinforced luffa cylindrica fiber/epoxy composites for X-band microwave absorption 石墨烯纳米板增强丝瓜纤维/环氧复合材料的x波段微波吸收

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-13 DOI: 10.1016/j.coco.2025.102682

Rajib Barik, Minarbha Pradhan, Adyasha Mahapatra, Ganeswar Nath

The growing expansion of electronic and communication systems has intensified electromagnetic interference, driving the need for efficient and eco-friendly microwave absorbing materials. At the same time, the disposal of agricultural residues poses serious environmental issues. The study utilizes luffa cylindrica fiber, an abundant agro-waste, as a bio-filler in epoxy-based composites for sustainable microwave absorption. Graphene nanoplatelets (GNPs) were incorporated as conductive fillers to enhance electromagnetic properties. Composites were prepared with different filler loadings: EPG1 (1 wt% GNP), EPL5 (5 wt% luffa), EPL5G1 (5 wt% luffa +1 wt% GNP), EPL10 (10 wt% luffa), and EPL10G1 (10 wt% luffa +1 wt% GNP). XRD and FTIR confirmed the structural and chemical characteristics of luffa cylindrica, while SEM revealed uniform dispersion and strong fiber-matrix bonding. Mechanical and thermal analyses showed that hybridization improved hardness and thermal stability. The EPL10G1 composite exhibited microwave attenuation across the X-band, achieving a minimum reflection loss of −34.32 dB at 3 mm thickness, corresponding to 90 % absorption efficiency with 4.2 GHz effective bandwidth. Furthermore, it showed a maximum electrical conductivity of 1.673 S/m, skin depth of 4.28 μm, attenuation coefficient of 498.99 Np/m, and impedance matching ratio of 0.96. These results highlight the potential of the composites as lightweight, sustainable, and high-performance materials for next generation microwave absorption applications.

电子和通信系统的日益扩大加剧了电磁干扰，推动了对高效和环保的微波吸收材料的需求。与此同时，农业残留物的处理也带来了严重的环境问题。利用丰富的农业废弃物丝瓜纤维作为生物填料，制备环氧基复合材料，实现微波的可持续吸收。石墨烯纳米片（GNPs）作为导电填料加入，以增强电磁性能。制备了不同填充量的复合材料：EPG1 （1 wt% GNP）、EPL5 （5 wt%丝瓜）、EPL5G1 （5 wt%丝瓜+1 wt% GNP）、EPL10 （10 wt%丝瓜）和EPL10G1 （10 wt%丝瓜+1 wt% GNP）。XRD和FTIR证实了丝瓜的结构和化学特征，SEM显示丝瓜分散均匀，纤维-基质结合强。力学和热分析表明，杂化提高了材料的硬度和热稳定性。EPL10G1复合材料表现出x波段的微波衰减，在3 mm厚度下的反射损耗最小为- 34.32 dB，在4.2 GHz有效带宽下的吸收效率为90%。最大电导率为1.673 S/m，趋肤深度为4.28 μm，衰减系数为498.99 Np/m，阻抗匹配比为0.96。这些结果突出了复合材料作为下一代微波吸收应用的轻质、可持续和高性能材料的潜力。

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引用次数: 0

The addition of a small amount of fossil-based epoxy resin enables enhanced toughness and cryogenic adhesion for bio-based epoxy thermosets 添加少量的化石基环氧树脂可以增强生物基环氧热固性材料的韧性和低温附着力

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-06 DOI: 10.1016/j.coco.2025.102672

Dayin Hu , Yuchen Liu , Anru Guo , Baochen Han , Man Huo , Guanzhi Cheng , Dong Liu

Bio-based epoxy thermosets are promising as alternatives to traditional fossil-based epoxy thermosets due to their environmental sustainability, biodegradability, and reduced toxicity, however, achieving high mechanical performance remains a challenge. Here we report a low-cost bio-based epoxidized soybean oil (ESO) thermoset that achieves high tensile strength with good toughness and excellent lap-shear strength at low temperature by designing the bio-based epoxy systems. Specifically, as the addition content of high-performance fossil-based epoxy resin (TGDDM) reaches 10 %, the resulting TGDDM/EMB-10 thermosets achieve the maximum toughness of 7.81 MJ cm⁻³, which is twice that of pure ESO-based thermosets. More importantly, the ESO-based epoxy thermoset exhibits high lap-shear strength across a wide temperature range, even under extreme low-temperature conditions (−80 °C). This work provides an effective approach to prepare high-performance bio-based epoxy thermosets via rational design of epoxy resin systems, which could be generalized for the synthesis of various high-performance bio-based epoxy thermosets.

生物基环氧热固性材料具有环境可持续性、可生物降解性和低毒性，有望成为传统化石基环氧热固性材料的替代品，然而，实现高机械性能仍然是一个挑战。本文报道了一种低成本的生物基环氧大豆油（ESO）热固性材料，通过设计生物基环氧体系，该材料具有良好的韧性和低温下优异的拉伸强度和剪切强度。其中，当高性能化石基环氧树脂（TGDDM）添加量达到10%时，所得TGDDM/EMB-10热固性树脂的最大韧性为7.81 MJ cm−3，是纯eso基热固性树脂的2倍。更重要的是，基于eso的环氧热固性材料在很宽的温度范围内，即使在极低温条件下（- 80°C），也能表现出很高的剪切强度。通过合理设计环氧树脂体系，为制备高性能生物基环氧热固性材料提供了一条有效途径，可推广到各种高性能生物基环氧热固性材料的合成。

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引用次数: 0

Enhancing the mechanical properties of cellulose modified epoxy resin matrix composites through intrinsic and extrinsic multiscale strengthening and toughening mechanisms 纤维素改性环氧树脂基复合材料的内、外多尺度强化增韧机制提高其力学性能

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-17 DOI: 10.1016/j.coco.2025.102685

Tingting Miao, Yiming Guo, Haodong Chen, Jinchen An, Xu Yang, Xiaohong Zhang, Lili Zhang, Xiaodong Wang

To address the inherent flaws of traditional resins and develop high-performance composites, this study designed a series of composites through a combination of intrinsic (resin level) and extrinsic multiscale synergistic effects (second phase filler). First, cellulose modified epoxy resin (CEME) was synthesized using 4,4′-diphenylmethane diisocyanate as a bridge agent between diglycidyl ether of bisphenol A (EP) and cellulose. The molecular structure of CEME was analyzed in detail through the FT-IR and ¹H NMR spectra. Subsequently, cellulose modified epoxy resin matrix composites were prepared using 4,4′-diaminodiphenyl methane (DDM) as the curing agent. In the preparation process, CEME served as the resin matrix, while nano-sized SiO₂ and micron-sized SCF were used as fillers. Compared to traditional EP/DDM, the synthesized CEME/DDM and its composites exhibited excellent mechanical properties. Especially, 3.0 %SCF/SiO₂/CEME/DDM showed the maximum tensile strength, elongation at break, flexural strength, fracture toughness and impact strength, which were 55.90 %, 71.97 %, 67.84 %, 163.73 % and 347.78 % higher than EP/DDM, respectively. The thermal stability of the cured resins and composites was characterized via TGA under an inert atmosphere of nitrogen. Simultaneously, the strengthening and toughening mechanisms of CEME/DDM and its composites were explored through SEM and the internal network.

为了解决传统树脂的固有缺陷，开发高性能复合材料，本研究通过内因（树脂级）和外因多尺度协同效应（第二相填料）相结合，设计了一系列复合材料。首先，以4,4′-二苯基甲烷二异氰酸酯为双酚a二缩水甘油酯醚（EP）与纤维素之间的桥接剂，合成纤维素改性环氧树脂（cme）。通过FT-IR和1H NMR对其分子结构进行了详细分析。随后，以4,4′-二氨基二苯甲烷（DDM）为固化剂，制备了纤维素改性环氧树脂基复合材料。在制备过程中，CEME作为树脂基体，纳米级SiO2和微米级SCF作为填料。与传统EP/DDM相比，合成的cme /DDM及其复合材料具有优异的力学性能。其中，3.0% SCF/SiO2/ cme /DDM的抗拉强度、断裂伸长率、弯曲强度、断裂韧性和冲击强度分别比EP/DDM高55.90%、71.97%、67.84%、163.73%和347.78%。在惰性氮气气氛下，通过热重分析表征了固化树脂和复合材料的热稳定性。同时，通过扫描电镜和内部网络对cme /DDM及其复合材料的强化增韧机理进行了探讨。

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引用次数: 0

Design and magnetic noise suppression of a nanocrystalline magnetic shielding cylinder with a gradient permeability composite structure 梯度磁导率复合结构纳米晶磁屏蔽筒的设计与磁噪声抑制

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-15 DOI: 10.1016/j.coco.2025.102683

Zhenkai Zhao , Xueping Xu , Wei Liu , Weiwei Wu , Qinkai Han

Nanocrystalline magnetic shielding cylinder (NMSC) is vital in establishing near-zero magnetic fields and low-noise environments for low-frequency magnetic measurements, such as magnetocardiography (MCG). Achieving high-sensitivity detection requires precise modeling and effective suppression of magnetic noise (MN). However, conventional NMSC often suffers from an inhomogeneous magnetic flux density distribution (MFDD), which induces local magnetic saturation, decreases the effective permeability, and leads to deviations in MN estimation. This study proposes an NMSC with a gradient permeability composite structure (GPCS) to address these challenges. This layered composite structure can control the regulation of magnetic permeability of the nanocrystalline strip (NS) radially, effectively homogenize MFDD, reduce magnetic flux congestion, and alleviate local saturation effects. In addition, the demagnetization mechanism for intrinsic MN suppression is systematically analyzed. Experimental results show that effective demagnetization enhances the overall permeability of the shielding assembly, suppresses environmental interference, and markedly reduces the intrinsic MN of the NMSC within the low-frequency range of 1–10 Hz. With the GPCS design, the magnetic flux inside the NMSC becomes uniformly distributed, and the discrepancy between theoretical predictions and experimental MN measurements decreases to within 10 %. Combined with a segmented demagnetization method, the average MN reduction in the 1–10 Hz range reaches 39.6 %. This work provides a novel approach for improving the sensitivity of MCG detection in low-frequency magnetic fields.

纳米晶体磁屏蔽柱体（NMSC）对于建立近零磁场和低噪声环境进行低频率磁测量，如磁心动图（MCG）至关重要。实现高灵敏度检测需要精确的建模和有效抑制磁噪声（MN）。然而，传统的磁通密度分布（MFDD）往往不均匀，导致局部磁饱和，降低有效磁导率，导致MN估计偏差。本研究提出了一种具有梯度渗透复合结构（GPCS）的NMSC来解决这些挑战。这种层状复合结构可以径向控制纳米晶带（NS）的磁导率调节，有效地均匀化MFDD，减少磁通堵塞，缓解局部饱和效应。此外，系统地分析了抑制本征MN的退磁机理。实验结果表明，有效退磁提高了屏蔽组件的整体磁导率，抑制了环境干扰，显著降低了NMSC在1 ~ 10 Hz低频范围内的固有MN。采用GPCS设计后，NMSC内部磁通量分布均匀，理论预测与实验测量结果的差异减小到10%以内。结合分段退磁方法，在1-10 Hz范围内MN平均降低达到39.6%。本工作为提高低频磁场中MCG检测的灵敏度提供了一种新的方法。

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引用次数: 0

Experimental and numerical investigation on compressive performance differences of 3D woven honeycomb composites reinforced by carbon, glass, and basalt fibers 碳纤维、玻璃纤维和玄武岩纤维增强三维编织蜂窝复合材料抗压性能差异的实验与数值研究

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2026-01-07 DOI: 10.1016/j.coco.2026.102704

Xiaoyu Wang , Tao Liu , Ruixing Zhu , Yuxuan Gao , Yijun Wang , Xiaomeng Chen , Yue Chen , Yiwei Ouyang , Jingjing Dong

Mechanical performance and cost-effectiveness have emerged as critical determinants for the selection of different fibers in composites manufacturing. This work adopted an integrated experimental and numerical approaches to systematically investigate the compressive behavior of 3D woven honeycomb composites (3DWHCs) reinforced with distinct fiber types. The findings reveal that the compressive response of 3DWHCs is strongly dependent on both loading direction and fiber category. For instance, basalt fiber-reinforced 3DWHCs exhibit the lowest compressive performance across all loading directions, primarily stemming from the weakest fiber-resin interfacial properties. Notably, the poor transverse and shear properties of carbon fibers result in their reinforced 3DWHCs not outperforming glass fiber-reinforced counterparts in out-of-plane compressive strength. Specifically, glass fiber-reinforced 3DWHCs exhibit the highest out-of-plane compressive strength (24.85 MPa), which is 4.5 % higher than that of the carbon fiber-reinforced system (23.74 MPa). In the warp direction, the carbon fiber-reinforced system performs optimally (36.43 MPa), which is 17.4 % and 36.9 % higher than the glass fiber-reinforced system (31.04 MPa) and the basalt fiber-reinforced system (26.60 MPa), respectively. The numerical results successfully reproduce experimental stress-strain curves and failure morphologies, thereby validating the capability to predict the compressive response and failure mechanism of 3DWHCs. This work lays a theoretical foundation for the industrial design and application of such composites.

机械性能和成本效益已经成为复合材料制造中选择不同纤维的关键决定因素。本文采用实验与数值相结合的方法，系统研究了不同纤维类型增强的三维编织蜂窝复合材料（3DWHCs）的压缩性能。研究结果表明，3DWHCs的压缩响应强烈依赖于加载方向和纤维种类。例如，玄武岩纤维增强的3DWHCs在所有加载方向上表现出最低的压缩性能，主要原因是纤维-树脂界面性能最弱。值得注意的是，碳纤维的横向和剪切性能较差，导致其增强的3DWHCs在面外抗压强度方面不如玻璃纤维增强的3DWHCs。其中，玻璃纤维增强3DWHCs的面外抗压强度最高（24.85 MPa），比碳纤维增强体系（23.74 MPa）高出4.5%。在翘曲方向上，碳纤维增强体系表现最佳（36.43 MPa），分别比玻璃纤维增强体系（31.04 MPa）和玄武岩纤维增强体系（26.60 MPa）高17.4%和36.9%。数值模拟结果成功再现了试验应力-应变曲线和破坏形态，验证了三维whcs压缩响应预测和破坏机制的能力。本工作为该类复合材料的工业设计和应用奠定了理论基础。

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引用次数: 0

Diagnosis and prognosis of probabilistic crack growth in composite adhesive joints for structural digital twins 结构数字双胞胎复合材料粘接接头概率裂纹扩展的诊断与预后

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-18 DOI: 10.1016/j.coco.2025.102684

Fubin Zhao, Hao Cui, Xiaodan Zhong, Jiaxing Wang

Accurate analysis of fatigue crack growth in composite adhesive joints, which are integral to aeronautical structures, is crucial for assessing structural integrity. However, uncertainties in model parameters and process noise introduce significant deviations between deterministic calculations and experimental results. To address this, we propose a particle filter-based method for diagnosing and prognosticating probabilistic crack growth in adhesive joints, enhancing the accuracy of structural digital twins. The crack front is modeled using a B-spline curve, and iso-parametric sampling generates the spatial features of the crack. Reduced-Order Models (ROMs) are trained using Principal Component Analysis (PCA) and Artificial Neural Networks (ANNs), with iso-parametric node coordinates as inputs and Strain Energy Release Rate (SERR) as outputs. The initial crack length and fatigue model parameters, sampled from the initial distribution, form the initial set for the particle filter algorithm. The digital twin model is then updated based on the inspection results of the crack length. The proposed method is validated using both hypothetical crack growth histories and a real crack growth experiment, showing effective reduction in model parameter uncertainty and accurate tracking of crack growth. Future work will focus on applying this method to more complex composite structures and developing inspection strategies.

复合材料粘接接头是航空结构的重要组成部分，其疲劳裂纹扩展特性的准确分析是评估结构完整性的关键。然而，模型参数的不确定性和过程噪声导致确定性计算与实验结果之间存在显著偏差。为了解决这个问题，我们提出了一种基于粒子滤波的方法来诊断和预测粘接接头的概率裂纹扩展，提高了结构数字孪生的准确性。采用b样条曲线对裂纹前缘进行建模，等参数采样生成裂纹的空间特征。采用主成分分析（PCA）和人工神经网络（ANNs）训练降阶模型（ROMs），以等参数节点坐标作为输入，应变能释放率（SERR）作为输出。从初始分布中采样的初始裂纹长度和疲劳模型参数构成粒子滤波算法的初始集。然后根据裂纹长度的检测结果更新数字孪生模型。通过假设裂纹扩展历史和实际裂纹扩展实验验证了该方法的有效性，有效地降低了模型参数的不确定性，并对裂纹扩展进行了准确的跟踪。未来的工作将集中于将该方法应用于更复杂的复合材料结构和开发检测策略。

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引用次数: 0

Effects of WMCNTs/GO grafted CF on the mechanical properties of CF/PA66 composites and molecular dynamics simulation study WMCNTs/GO接枝CF对CF/PA66复合材料力学性能的影响及分子动力学模拟研究

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications

Pub Date : 2026-01-01 Epub Date: 2025-12-22 DOI: 10.1016/j.coco.2025.102691

Heng Wang , Meili Zhang , Linwen Shao , Ziyi Xu , Yan Wang , Huifang Chen

This study investigates the chemical modification of carbon fiber (CF) surfaces using 3-aminopropyltriethoxysilane (KH550) as a grafting agent to enhance interfacial properties between CFs and nylon 66 (PA66) matrix. The modified CF surfaces were further functionalized with graphene oxide (GO) and carboxylated multi-walled carbon nanotubes (WMCNTs). The mechanical properties of composites reinforced with GO and WMCNTs modified CFs were systematically evaluated and compared to those reinforced with oxidized and untreated CFs. Molecular dynamics (MD) simulations were conducted to gain insights into the molecular mechanisms underlying the interfacial behavior. The surface morphology, chemical composition, and wettability of the modified CFs were analyzed and characterized using multiple analytical techniques, including scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and contact angle measurement. Experimental results indicated that the modified CFs exhibited significantly increased surface roughness, more functional groups, and enhanced wettability. Mechanical testing revealed significant improvements in interfacial shear strength (IFSS) and interlaminar shear strength (ILSS) of the modified CF/PA66 composites compared with unmodified counterparts. Specifically, CF-GO/PA66 composites exhibited increases of 47.8 % (IFSS), 10.9 % (ILSS) and 20% (flexural strength), while CF-WMCNTs/PA66 composites showed greater improvements of 62.2 % (IFSS), 22.1 % (ILSS) and 32% (flexural strength). Furthermore, molecular dynamics simulations revealed that interfacial performance was primarily governed by interfacial interaction energy. Specifically, the interfacial interaction energy increased by 34.5 % and 73.7 % for CF-GO/PA66 and CF-WMCNTs/PA66 composites, respectively, compared to the unmodified system. This improvement was mainly attributed to enhanced electrostatic interactions at the interface. This work offers a prospective pathway for developing structural applications of next-generation high-performance thermoplastic composites.

研究了以3-氨基丙基三乙氧基硅烷（KH550）为接枝剂对碳纤维（CF）表面进行化学改性，以提高碳纤维与尼龙66 （PA66）基体之间的界面性能。改性后的CF表面被氧化石墨烯（GO）和羧化多壁碳纳米管（WMCNTs）进一步功能化。系统评价了氧化石墨烯和WMCNTs改性碳纤维增强复合材料的力学性能，并与氧化碳纤维和未处理碳纤维增强复合材料进行了比较。进行了分子动力学（MD）模拟，以深入了解界面行为的分子机制。利用扫描电镜（SEM）、傅里叶变换红外光谱（FTIR）、拉曼光谱（Raman）和接触角测量等多种分析技术对改性碳纤维的表面形貌、化学成分和润湿性进行了分析和表征。实验结果表明，改性后的碳纤维表面粗糙度显著提高，官能团增多，润湿性增强。力学试验表明，改性后的CF/PA66复合材料的界面剪切强度（IFSS）和层间剪切强度（ILSS）与未改性的CF/PA66复合材料相比有显著提高。其中，CF-GO/PA66复合材料的抗弯强度分别提高了47.8% （IFSS）、10.9% （ILSS）和20%，而CF-WMCNTs/PA66复合材料的抗弯强度分别提高了62.2% （IFSS）、22.1% （ILSS）和32% （ILSS）。此外，分子动力学模拟表明，界面性能主要受界面相互作用能的控制。具体来说，CF-GO/PA66和CF-WMCNTs/PA66复合材料的界面相互作用能分别比未改性的体系提高了34.5%和73.7%。这种改进主要归因于界面上静电相互作用的增强。这项工作为开发下一代高性能热塑性复合材料的结构应用提供了一条有前景的途径。

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