Composites Part A: Applied Science and Manufacturing最新文献

Influence of 3D printing path and continuous Flax yarn reinforcement on the performance of additively manufactured T-joints for large-scale components 3D打印路径和连续亚麻纱增强对大型零件增材制造t型接头性能的影响

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-28 DOI: 10.1016/j.compositesa.2026.109609

Natália V. dos Santos , K.Sales de Oliveira , T. Doca , Alberto Giubilini , Vitor F. de S. de Botton , Paolo Minetola , Mariana D. Banea , Daniel Carlos T. Cardoso

The design of optimized 3D printing paths is a key factor in improving the structural performance of continuous fiber-reinforced composites, especially for complex geometries are difficult to achieve using conventional manufacturing techniques. This study investigates the combined influence of continuous flax yarns as a bio-based reinforcement for Polylactic Acid and layer-wise printing path strategies on the mechanical response of printed components. Special emphasis is placed on T-joint configurations, which represent critical structural regions subjected to complex multi-axial stress states and govern load transfer and failure mechanism. Printing paths were specifically engineered to follow load-transfer directions, and intermediate reinforcement layers were introduced to enhance joint behavior. Experimental results demonstrate that both path optimization and continuous natural fiber reinforcement significantly improve the rotational response of the joints, leading to increased stiffness and moment capacity, as well as reduced brittleness and improved ductility when compared to unreinforced specimens. The results further indicate a synergistic interaction between adaptive path design and bio-based continuous yarn reinforcement, offering a viable route toward high-performance and sustainable continuous fiber-reinforced thermoplastic composites capable of sustaining complex loading conditions. In addition, a simplified bilinear model is proposed to describe the moment–rotation behavior of T-joint profiles, supporting structural interpretation and facilitating future numerical and design-oriented applications.

优化3D打印路径的设计是提高连续纤维增强复合材料结构性能的关键因素，特别是对于使用传统制造技术难以实现的复杂几何形状。本研究探讨了连续亚麻纱作为聚乳酸的生物基增强剂和分层印刷路径策略对印刷部件机械响应的综合影响。特别强调的是t形接头配置，它代表了受复杂多轴应力状态影响的关键结构区域，并控制着载荷传递和破坏机制。打印路径是专门设计的，以遵循载荷传递方向，并引入中间增强层，以提高接头的行为。实验结果表明，与未加筋试件相比，路径优化和连续天然纤维增强均显著改善了节点的转动响应，从而提高了节点的刚度和弯矩承载力，降低了脆性，提高了延性。研究结果进一步表明，自适应路径设计和生物基连续纱线增强之间存在协同作用，为实现能够承受复杂载荷条件的高性能和可持续的连续纤维增强热塑性复合材料提供了可行的途径。此外，提出了一种简化的双线性模型来描述t型接头的弯矩旋转行为，为结构解释提供支持，并为未来的数值和面向设计的应用提供便利。

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引用次数: 0

Ultrahigh-strength polybenzoxazine@polyimide nanofiber aerogels enabled by coaxial 1D building blocks via semi-crystalline structuring 超高强度polybenzoxazine@polyimide纳米纤维气凝胶是通过半晶体结构的同轴一维构建块实现的

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-27 DOI: 10.1016/j.compositesa.2026.109607

Xin Long , Longfei Li , Lichun Zhou , Yu Wang , Jubo Tang , Jianan Qin , Xiongbang Wei , Ying Lin , Peng Huang , Jiaxuan Liao

The performance drawback caused by low strength limits the independent application of aerogels in complex mechanical environments. To date, no effective method has been developed to optimize this property of aerogels without compromising other performance characteristics. Inspired by aerogel structural engineering design, we report a composite aerogel, named PBZ@PI-CA, which features a 1D building block with polyimide (PI) nanofiber as the endothecium, semi-crystalline polybenzoxazine (PBZ) as the periphery, and hydrophobic SiO₂ nanopowder (hydrophobic-260) discretely distributed on the outermost surface. A stable peptide bond connection is formed at the interface between the PBZ periphery and the PI nanofiber endothecium. This material exhibits numerous outstanding properties, including ultra-high strength, excellent deformability and elastic compressibility, excellent structural stability, remarkable lightweight high-strength characteristic, good thermal stability, high-efficiency thermal insulation, superhydrophobicity, and strong hydrophobic stability. The combination of these superior properties provides an attractive material system for thermal insulation and superhydrophobicity under complex mechanical environments.

低强度导致的性能缺陷限制了气凝胶在复杂机械环境中的独立应用。到目前为止，还没有一种有效的方法可以在不影响其他性能特性的情况下优化气凝胶的这种特性。受气凝胶结构工程设计的启发，我们报道了一种名为PBZ@PI-CA的复合气凝胶，其特征是聚酰亚胺（PI）纳米纤维为内膜，半晶聚苯并恶嗪（PBZ）为外围，疏水SiO2纳米粉末（疏水-260）离散分布在最外层。在PBZ外周和PI纳米纤维内膜之间的界面处形成了稳定的肽键连接。该材料具有超高强度、优异的变形性和弹性压缩性、优异的结构稳定性、显著的轻质高强特性、良好的热稳定性、高效隔热、超疏水性和强疏水稳定性。这些优越性能的结合为复杂机械环境下的隔热和超疏水性提供了一个有吸引力的材料体系。

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引用次数: 0

Multiscale computational modelling of novel 3D printed structure of cellulose nanocrystal-reinforced polymer composites 新型纤维素纳米晶增强聚合物复合材料3D打印结构的多尺度计算建模

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-26 DOI: 10.1016/j.compositesa.2026.109605

Koshi Iwata , Chao Luo , Yasutomo Uetsuji

A novel concept of highly cellulose nanocrystal (CNC)-filled filament-reinforced polymer composite was proposed to enhance the mechanical properties of biocomposites. A multiscale finite element analysis based on homogenization theory was applied to clarify the nonlinear content dependence of the mechanical properties of unidirectionally-oriented CNC-filled polylactic acid (PLA) filaments. The computation demonstrated the superiority of filament-reinforced composites, with Young’s modulus and maximum stress improved by 16.9% and 27.6%, respectively, compared with conventional uniformly-dispersed composites. Then the effects of local CNC content in filament and global CNC content in composite were clarified as design guidelines for enhancing nonlinear mechanical properties. Furthermore, the proposed concept was applied to fused filament fabrication, and its effect on mechanical properties was clarified.

为了提高生物复合材料的力学性能，提出了高纤维素纳米晶（CNC）填充长丝增强聚合物复合材料的新概念。采用基于均质化理论的多尺度有限元分析方法，阐明了单向cnc填充聚乳酸（PLA）长丝力学性能的非线性含量依赖关系。计算结果表明，长丝增强复合材料的杨氏模量和最大应力分别比常规均匀分散复合材料提高了16.9%和27.6%。阐明了长丝中局部CNC含量和复合材料中整体CNC含量对复合材料非线性力学性能的影响。并将该概念应用于熔断丝的制备，阐明了熔断丝对其力学性能的影响。

引用次数: 0

Hyperbranched polyborosiloxane as a multifunctional flame retardant for simultaneously enhancing fire safety, mechanical properties, and hydrophobicity of polycarbonate 超支化聚硼硅氧烷作为一种多功能阻燃剂，可同时提高聚碳酸酯的防火安全性、机械性能和疏水性

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-26 DOI: 10.1016/j.compositesa.2026.109606

Yixiao Shi, Guang Li, Jiaen Qian, Jiafeng Lu, Qinghua Pan, Yanjiang Song, Hong Dong, Chuan Wu

Polycarbonate (PC) is widely used in applications that require optical transparency and fire safety; however, conventional flame retardants often compromise its mechanical properties and clarity. In this study, a series of hyperbranched polyborosiloxanes (PBS) with varying boron-to-silicon ratios was synthesized via a one-step dehydration condensation reaction. The effects of PBS on the flame-retardant performance, mechanical properties, optical transparency, and hydrophobicity of PC were systematically investigated. Results demonstrated that PBS-C, with the highest boron content, significantly improved the flame retardancy of PC. At a loading of 6 wt%, the PC/PBS-C6 composite achieved a UL-94V-0 rating and a high limiting oxygen index (LOI) of 40.3. Cone calorimetry tests revealed reductions in peak heat release rate (PHRR) and total heat release (THR) by 35.9% and 15.7%, respectively. Moreover, the composite exhibited enhanced mechanical properties, with flexural strength and impact strength increasing by 28.8% and 21.9%, respectively. The incorporation of PBS also improved the hydrophobicity (water contact angle up to 108.86°) while maintaining high optical transmittance (>83%). This work presents a promising strategy for developing high-performance PC composites with balanced flame retardancy, mechanical strength, and transparency.

聚碳酸酯（PC）广泛用于要求光学透明度和防火安全的应用；然而，传统的阻燃剂往往会损害其机械性能和透明度。本研究通过一步脱水缩合反应合成了一系列不同硼硅比的超支化聚硼硅氧烷（PBS）。系统研究了PBS对PC的阻燃性能、力学性能、光学透明度和疏水性的影响。结果表明，硼含量最高的PBS-C显著提高了PC的阻燃性。在负载为6 wt%时，PC/PBS-C6复合材料达到了UL-94V-0额定值和40.3的高极限氧指数（LOI）。锥量热测试显示，峰值放热率（PHRR）和总放热率（THR）分别降低了35.9%和15.7%。此外，复合材料的力学性能也得到了增强，抗弯强度和冲击强度分别提高了28.8%和21.9%。PBS的掺入也提高了疏水性（水接触角高达108.86°），同时保持了较高的透光率（>83%）。这项工作为开发具有平衡阻燃性，机械强度和透明度的高性能PC复合材料提供了一个有前途的策略。

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引用次数: 0

Inverse design of constituent materials of 3D hybrid woven composites for tailored effective properties using reduced order model and genetic algorithm 基于降阶模型和遗传算法的三维杂化机织复合材料有效性能反设计

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-24 DOI: 10.1016/j.compositesa.2026.109601

Shilian Sun , Weijie Zhang , Ying Yan , Xi Zou , Shibo Yan

3D hybrid woven composites can exhibit superior mechanical performance compared to non-hybrid counterparts, due to synergistic effects arising from the combination of fibres with different properties. However, the design space of such materials expands exponentially with the number of yarns and candidate fibre types, rendering trial-and-error approaches impractical for identifying a global optimum within this vast parameter space. In this work, we propose an efficient inverse design framework for tailoring the effective properties of 3D woven hybrid composites through the selection of constituent materials. The framework integrates a genetic algorithm as an optimiser to automatically search for optimal constituent material combinations, while employing a reduced order model generated by the proper generalised decomposition method as a rapid forward predictor of effective properties during iterations. The proposed inverse design framework was verified through a case study on 3D hybrid orthogonal woven composites, involving a design space of one million potential combinations of constituent materials. The computational time of material characterisation in the inverse design framework results in an acceleration of approximately 122 times compared to the conventional numerical homogenisation in the case study. The results confirm the framework’s ability to efficiently navigate vast design spaces to identify optimal solutions with high computational performance.

由于不同性能的纤维组合产生的协同效应，与非混杂编织复合材料相比，3D混杂编织复合材料可以表现出优越的机械性能。然而，这种材料的设计空间随着纱线和候选纤维类型的数量呈指数级增长，使得在这种巨大的参数空间内确定全局最优的试错方法不切实际。在这项工作中，我们提出了一个有效的逆向设计框架，通过选择成分材料来定制三维编织混杂复合材料的有效性能。该框架集成了遗传算法作为优化器来自动搜索最佳成分材料组合，同时采用由适当的广义分解方法生成的降阶模型作为迭代期间有效特性的快速前向预测器。通过三维混合正交编织复合材料的案例研究，验证了所提出的反设计框架，涉及100万种组成材料的潜在组合的设计空间。与案例研究中的传统数值均匀化相比，在反设计框架中材料表征的计算时间导致加速度约为122倍。结果证实了该框架能够有效地导航巨大的设计空间，以确定具有高计算性能的最佳解决方案。

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引用次数: 0

Modeling pseudo-ductile failure in hybrid fiber composites using an FFT-based solver with non-periodic boundary conditions 基于非周期边界条件的fft求解器模拟混杂纤维复合材料的伪延性破坏

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-24 DOI: 10.1016/j.compositesa.2026.109599

Rui Cao , Xiaoqiang Wang , Zhongliang Yu , Chaonan Cong , Xiaoding Wei , Huiqi Ren

Fast Fourier Transform (FFT)-based micromechanical solvers are widely recognized for their computational efficiency, yet their classical formulations naturally favor periodic boundary conditions (PBCs). To simulate the mechanical response of hybrid fiber-reinforced laminates under realistic non-periodic constraints, this work implements a 2D FFT-based numerical framework adapted from established displacement decomposition strategies. By employing a Galerkin projection with numerical integration and a minimal one-pixel auxiliary layer, the method efficiently handles mixed Dirichlet and Neumann boundary conditions within the spectral solver context. The accuracy of this implementation is validated through comparison with Finite Element Method (FEM) simulations, showing excellent agreement in stress fields. The primary contribution of this study lies in utilizing this adapted framework to investigate the pseudo-ductile failure mechanisms of thin-ply carbon/glass hybrid laminates. The simulations successfully capture the experimentally observed transitions in damage modes, from intralaminar fragmentation to interfacial delamination, as the carbon ply thickness varies. Overall, this work demonstrates that this adapted FFT-based approach offers a fast and scalable alternative for modeling complex progressive damage in hybrid composites, providing valuable insights for the design of damage-tolerant architectures.

基于快速傅里叶变换（FFT）的微机械求解因其计算效率而得到广泛认可，但其经典公式自然倾向于周期边界条件（pbc）。为了模拟混杂纤维增强层合板在现实非周期约束下的力学响应，本工作实现了基于二维fft的数值框架，该框架采用了已建立的位移分解策略。该方法采用具有数值积分的伽辽金投影和最小的一像素辅助层，有效地处理了谱解上下文中的Dirichlet和Neumann混合边界条件。通过与有限元法（FEM）仿真的比较，验证了该方法的准确性，在应力场中显示出良好的一致性。本研究的主要贡献在于利用这种适应框架来研究薄层碳/玻璃杂化层压板的伪延性破坏机制。随着碳层厚度的变化，模拟成功地捕获了实验观察到的损伤模式的转变，从层内破碎到界面分层。总的来说，这项工作表明，这种基于fft的方法为混合复合材料中复杂的渐进损伤建模提供了一种快速和可扩展的替代方案，为损伤容忍架构的设计提供了宝贵的见解。

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引用次数: 0

A novel parametric modeling method for 3D needled composites considering mesostructure characteristics 一种考虑细观结构特征的三维针刺复合材料参数化建模新方法

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-24 DOI: 10.1016/j.compositesa.2026.109600

Jianwei Qiao , Jingran Ge , Jun Liang

The mesostructure of three-dimensional (3D) needled composites is highly complex, making it challenging for traditional modeling approaches to balance mesostructural fidelity with computational efficiency. To address this issue, this paper proposes a novel parametric modeling method that considers the key mesostructure characteristics of 3D needled composites. Guided by the deflection law of the needled region, the original layers, needled fiber bundles, and the deflected structures are uniformly represented in the model. This approach retains the critical mesostructure characteristics while reducing computation time by two orders of magnitude compared to the high-fidelity model. The reliability of the prediction results is further validated through experimental comparison using the composites prepared from T800 twill woven, short-chopped fiber felt, and phenolic resin. Moreover, the modeling method is independent of specific needling process parameters, demonstrating strong generality. Overall, the proposed parametric modeling method provides an efficient and accurate tool for predicting performance and optimizing the structure of 3D needled composites.

三维针状复合材料的细观结构非常复杂，传统的建模方法很难在细观结构保真度和计算效率之间取得平衡。为了解决这一问题，本文提出了一种新的参数化建模方法，该方法考虑了三维针刺复合材料的关键细观结构特征。在针刺区挠曲规律的指导下，将原始层、针刺纤维束和挠曲结构均匀地表示在模型中。与高保真模型相比，该方法保留了关键的细观结构特征，同时减少了两个数量级的计算时间。通过T800斜纹布、短切纤维毡和酚醛树脂制备的复合材料的实验对比，进一步验证了预测结果的可靠性。此外，该建模方法不依赖于具体的针刺工艺参数，具有较强的通用性。总之，所提出的参数化建模方法为三维针刺复合材料的性能预测和结构优化提供了一种高效、准确的工具。

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引用次数: 0

Nanoscale toughening strategy for colloidal calcium silicate hydrate/crystalline calcium hydroxide interface in cementitious composites via molecular bridging in protrusion-induced gap 胶凝复合材料中水合硅酸钙胶体/结晶氢氧化钙界面的分子桥接增韧策略

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-24 DOI: 10.1016/j.compositesa.2026.109597

Jingbo Zhuo , Ao Zhou , Zechuan Yu , Tiejun Liu

The interplay between amorphous colloid, crystalline phase, and their interface critically impacts the physics and mechanical behavior of multiphase composites. Colloidal calcium silicate hydrate (C-S-H) and crystalline calcium hydroxide (CH) are primary hydration products of cementitious composite, and the design of multiphase composites prefers C-S-H for mechanical properties. Yet, the significant performance gap between C-S-H and CH makes the C-S-H/CH interface a critical weak link affecting material behavior, and we propose a novel reinforcing strategy redistributing CH within the interface. An upscaling methodology is developed through remapping coarse-grained models to all-atom models, which overcomes barriers in realistic modeling of C-S-H/CH interface and identifying interactions between C-S-H and CH. This study reveals the impact of surface-layer configuration of CH, C-S-H roughness, and water on interfacial properties. Molecular dynamics simulations show that nanoscale protrusion of C-S-H/CH interface is primary contributor to poor toughness. Pore water bridges void and improves interfacial integrity, and embedding residual CH in interface region enhances toughness by over 525%, accompanied with shift of failure mode from interface failure to interlayer failure of CH. Such reinforcing mechanism fills protrusion-induced gap with ions or nanoparticles featuring specific binding, promoting atomic-level understanding of the interface between colloid and crystal, paving the way for in-situ interface-targeted regulation in advanced cementitious composites design.

非晶胶体、晶相及其界面之间的相互作用对多相复合材料的物理力学行为有重要影响。胶体水化硅酸钙（C-S-H）和结晶氢氧化钙（CH）是胶凝复合材料的主要水化产物，多相复合材料的力学性能更倾向于C-S-H。然而，C-S-H和CH之间的显著性能差距使得C-S-H/CH界面成为影响材料性能的关键薄弱环节，我们提出了一种新的增强策略，在界面内重新分配CH。通过将粗粒度模型重新映射到全原子模型，开发了一种升级方法，克服了实际建模C-S-H/CH界面的障碍，并确定了C-S-H和CH之间的相互作用。本研究揭示了CH的表面层构型、C-S-H粗糙度和水对界面性质的影响。分子动力学模拟表明，C-S-H/CH界面的纳米级突出是导致韧性差的主要原因。孔隙水架起空隙，提高了界面的完整性，在界面区域内嵌入残余CH，韧性提高了525%以上，同时CH的破坏模式从界面破坏向层间破坏转变。这种强化机制用具有特异性结合的离子或纳米粒子填补了突出引起的空隙，促进了对胶体与晶体界面的原子水平理解。为先进胶凝复合材料原位界面定向调节设计铺平道路。

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引用次数: 0

Effects of metal ions infiltration on degradation performances of the polypropylene-based cable semiconductive shielding layer 金属离子渗透对聚丙烯基电缆半导体屏蔽层降解性能的影响

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-22 DOI: 10.1016/j.compositesa.2026.109590

Cheng Tong , Xiyu Zhang , Shangshi Huang , Xiaoping Xiong , Yong Liang , Jun Hu , Qi Li , Jinliang He

Polypropylene (PP) based power cables are recognized as a potential solution for large-capacity power transmission due to their superior electrical strength and high operating temperature. Evaluating the aging process of cable materials is crucial for safe operation. This paper focuses on the effect of metal involved aging process on the conductor shielding layer. Conducting the 27-day accelerated aging experiment, the influence of the contact of polypropylene-based shielding layer with Cu and Al conductors on degradation performances is compared and the effect of metal deactivator is assessed. The results show that the diffusion of copper ions and thermal oxidation reduce the thermal stability of the shielding layer and lead to a chemicrystallization effect. The aging effect is manifested macroscopically as the deterioration of mechanical properties and the increase in electrical resistivity. Cu-contacted samples perform severer degradation than Al-contacted samples. While the presence of metal deactivator greatly suppresses the diffusion of copper ions and inhibits their catalytic activity by forming complexes, making the degradation in Cu-contacted materials significantly reduced. Finally, a mechanism is developed to associate the macro-property reduction with the crystal structures variation during aging. This work provides a reference for evaluating the aging of PP cables and developing shielding materials.

基于聚丙烯（PP）的电力电缆因其优越的电气强度和高工作温度而被认为是大容量电力传输的潜在解决方案。评估电缆材料的老化过程对电缆的安全运行至关重要。本文重点研究了金属参与老化过程对导体屏蔽层的影响。通过27天的加速老化实验，比较了聚丙烯基屏蔽层与Cu和Al导体接触对降解性能的影响，并评价了金属灭活剂的效果。结果表明，铜离子的扩散和热氧化降低了屏蔽层的热稳定性，导致了化学结晶效应。时效效应在宏观上表现为力学性能的恶化和电阻率的升高。cu接触的样品比al接触的样品降解更严重。而金属失活剂的存在极大地抑制了铜离子的扩散，通过形成配合物抑制了铜离子的催化活性，使得铜接触材料中的降解明显降低。最后，提出了宏观性能降低与时效过程中晶体结构变化之间的联系机制。为PP电缆老化性能的评定和屏蔽材料的开发提供参考。

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引用次数: 0

Stress-state and strain-rate dependency of fracture in SCFR-PEEK composites under biaxial loading 双轴载荷下SCFR-PEEK复合材料断裂的应力状态与应变速率关系

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-01-21 DOI: 10.1016/j.compositesa.2026.109594

Wencheng Liu , Xinghao Li , Hang Dong , Yong Pang , Yulong Li , Huanming Chen , Hao Cui

This study presents a hybrid experimental-modelling framework to investigate the anisotropic deformation, strain-rate sensitivity, and fracture behaviour of short carbon fibre reinforced polyether-ether-ketone (SCFR-PEEK) composites subjected to in-plane multiaxial loading. Quasi-static uniaxial and biaxial tensile responses were characterised using an electromechanical biaxial testing system, while dynamic uniaxial and biaxial tensile tests were conducted using an electromagnetic biaxial split Hopkinson bar (EBSHB) apparatus, enabling systematic assessment of material behaviour over a wide range of strain rates. The comprehensive experimental dataset formed the basis for the development of a phenomenological anisotropic elastoplastic constitutive model capable of reproducing rate-dependent deformation and fracture responses under diverse stress states. The proposed model integrates orthotropic elastic properties, an anisotropic yield function, a strain-rate dependent hardening law, and a stress-state dependent anisotropic fracture criterion. Model parameters were identified from uniaxial and biaxial tensile tests that explicitly account for fibre alignment and directional anisotropy, and were calibrated separately for quasi-static and dynamic regimes to ensure predictive consistency across loading rates. The coupled constitutive and fracture framework was implemented within a finite-element framework to enable high-fidelity simulation of anisotropic elastoplastic deformation and fracture under complex multiaxial loading paths. Model validation was performed through quasi-static Nakajima tests and dynamic drop-weight impact experiments involving biaxial stress states. The simulations show good agreement with experimental observations in terms of deformation evolution, strain localisation, and fracture initiation. The developed framework therefore provides a robust and versatile tool for predictive simulation of coupled deformation and fracture processes in SCFR-PEEK composites under realistic multiaxial and rate-dependent loading conditions.

本研究提出了一种混合实验-模型框架来研究短碳纤维增强聚醚醚酮（SCFR-PEEK）复合材料在平面内多轴载荷作用下的各向异性变形、应变率敏感性和断裂行为。准静态单轴和双轴拉伸响应使用机电双轴测试系统进行表征，而动态单轴和双轴拉伸测试使用电磁双轴分裂霍普金森杆（EBSHB）设备进行，能够在广泛的应变率范围内系统评估材料行为。综合实验数据集为开发现象学各向异性弹塑性本构模型奠定了基础，该模型能够再现不同应力状态下的速率相关变形和断裂响应。该模型集成了正交各向异性弹性特性、各向异性屈服函数、应变率相关的硬化规律和应力状态相关的各向异性断裂准则。模型参数是从单轴和双轴拉伸测试中确定的，这些测试明确考虑了纤维的排列和方向各向异性，并分别针对准静态和动态机制进行了校准，以确保在不同加载速率下的预测一致性。在有限元框架内实现了本构与断裂耦合框架，实现了复杂多轴加载路径下各向异性弹塑性变形与断裂的高保真模拟。通过准静态Nakajima试验和双轴应力状态下的动态落锤冲击试验对模型进行验证。在变形演化、应变局部化和断裂起裂方面，模拟结果与实验结果吻合较好。因此，开发的框架为SCFR-PEEK复合材料在实际多轴和速率相关加载条件下的耦合变形和断裂过程的预测模拟提供了一个强大而通用的工具。

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引用次数: 0