Composites Part C Open Access最新文献_第3页

Revalorisation of recycled PLA through Halloysite nanotube integration for mechanical and thermal property improvement 利用高岭石纳米管整合再生PLA以改善其机械和热性能

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100670

Anbuchezhiyan Gnanasambandam , Vigneshwaran Shanmugam , Elif Kaynak , Oisik Das

This study investigates the effect of Halloysite nanotube (HNT) reinforcement on the mechanical, thermal, and structural properties of recycled polylactic acid (rPLA) composites. Composites were prepared with 1-5 wt.% HNTs and characterised using tensile, flexural, compressive testing, thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Tensile strength increased from 42.98 MPa for neat rPLA to a maximum of 49.39 MPa at 2 wt.% HNT, while tensile modulus improved steadily from 2423.13 MPa to 2971.26 MPa at 5 wt.%. Flexural strength peaked at 78.54 MPa (22 % improvement compared to neat rPLA) at 3 wt.%, and the highest flexural modulus of 2292.30 MPa was achieved at 4 wt.% HNT. Under compressive loading, strength and modulus increased from 100.94 MPa and 2361.52 MPa for neat rPLA to 108.69 MPa and 2479.87 MPa, respectively, at 5 wt.% HNT, showing improved resistance to deformation. Thermal degradation temperatures rose from 452.12 °C for rPLA to 465.58 °C at 5 wt.% HNT, with char residue at 600 °C increasing from 4.23 % to 9.96 %, confirming the thermal barrier effect of Halloysite. XRD analysis showed enhanced crystallinity, increasing from 57.49 % (neat rPLA) to 59.22 % at 5 wt.% HNT, indicating effective nucleation and structural ordering induced by the nanotubes. Overall, the incorporation of 2-4 wt.% Halloysite offered the most balanced improvement in strength, stiffness, and thermal stability. These results demonstrate that rPLA-Halloysite composites can be suitable for sustainable, high-performance applications in packaging, automotive interiors, and structural bioplastics.

研究了高岭土纳米管（HNT）增强剂对再生聚乳酸（rPLA）复合材料力学性能、热性能和结构性能的影响。用1-5 wt.%的HNTs制备复合材料，并通过拉伸、弯曲、压缩测试、热重分析（TGA）和x射线衍射（XRD）对其进行表征。拉伸强度从纯rPLA的42.98 MPa增加到2 wt.% HNT时的最大值49.39 MPa，拉伸模量从2423.13 MPa稳步提高到5 wt.% HNT时的2971.26 MPa。在3 wt.% HNT时，抗弯强度达到78.54 MPa（比纯rPLA提高22%），在4 wt.% HNT时，抗弯模量达到2292.30 MPa。在压缩载荷作用下，纯rPLA的强度和模量分别从100.94 MPa和2361.52 MPa增加到108.69 MPa和2479.87 MPa，在5 wt.% HNT条件下，rPLA的抗变形能力有所提高。在5 wt.% HNT条件下，rPLA的热降解温度从452.12℃上升到465.58℃，600℃时炭渣从4.23%上升到9.96%，证实了高岭土的热障作用。XRD分析表明，在5 wt.% HNT条件下，纳米管的结晶度从57.49%（纯rPLA）提高到59.22%（纯rPLA），表明纳米管诱导了有效的成核和结构有序。总的来说，加入2-4 wt.%的高岭土在强度、刚度和热稳定性方面提供了最平衡的改善。这些结果表明，rpla -高岭土复合材料可以适用于包装、汽车内饰和结构生物塑料的可持续、高性能应用。

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引用次数: 0

Effective properties of viscoelastic piezoelectric materials using homogenisation on representative volume finite elements 粘弹性压电材料在代表性体积有限元上的有效性能研究

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100663

Felipe Ruivo Fuga , Yunior Muñoz Naranjo , Reinaldo Rodríguez-Ramos , José Antonio Otero , Volnei Tita , Ricardo De Medeiros

This paper introduces a comprehensive methodology for determining the effective piezo-electromechanical properties considering viscoelastic effects in the composite material. The methodology uses finite element (FE) analysis and homogenisation. By formulating the FE solution as a dynamic equilibrium problem, the proposed approach effectively couples linear elastic piezoelectric fibres within a linear viscoelastic matrix. This couples both complex constitutive behaviours into a single representative cell for time-dependent quasi-static load cases. A virtual stress relaxation test is conducted on a Representative Volume Element (RVE) with periodic boundary conditions. The methodology disregards inertial effects to represent quasi-static loading conditions. It assumes a polymeric matrix phase with only mechanical degrees of freedom. The computed effective time-dependent constitutive coefficients are compared with analytical solutions derived from effective field and asymptotic homogenisation methods for a circular piezoelectric fibre in a viscoelastic polymeric matrix. Despite the simplifying assumption for the polymer matrix, the usage of a time-independent Halpin–Tsai model for effective electric permittivity, coupled with the proposed FE approach, accurately predicts time-dependent behaviour of elastic, piezoelectric and dielectric effective coefficients for different fibre volume ratios. Thus, the proposed approach provides a robust and versatile framework for characterising effective piezoviscoelastic properties. This makes a contribution to the field of micromechanical piezoelectric simulation, paving the way for future research into dynamic effects, more complex material constitutive models, and intricate geometric features.

本文介绍了一种考虑粘弹性效应的复合材料有效压电机电性能测定方法。该方法使用有限元（FE）分析和均质化。通过将有限元解表述为一个动态平衡问题，该方法有效地将线性弹性压电纤维耦合在一个线性粘弹性矩阵中。这将两个复杂的本构行为耦合到一个具有代表性的单元中，用于时间相关的准静态负载情况。对具有周期边界条件的代表性体积单元进行了虚拟应力松弛试验。该方法不考虑惯性效应来表示准静态加载条件。它假设一个只有机械自由度的聚合物基质相。本文将计算得到的有效时变本构系数与用有效场法和渐近均质法得到的粘弹性聚合物基体中圆形压电纤维的解析解进行比较。尽管简化了聚合物基体的假设，但使用与时间无关的Halpin-Tsai有效介电常数模型，加上所提出的有限元方法，可以准确预测不同纤维体积比下弹性、压电和介电有效系数的时间相关行为。因此，所提出的方法为表征有效的压粘弹性特性提供了一个鲁棒和通用的框架。这为压电微机械仿真领域做出了贡献，为未来研究动态效应、更复杂的材料本构模型和复杂的几何特征铺平了道路。

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引用次数: 0

Recycling multi-layer plastic packaging waste as core material for aluminum composite panels in sustainable building applications 回收多层塑料包装废弃物作为铝复合板在可持续建筑应用中的核心材料

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100666

Sokleng Srou , Ponlapath Tipboonsri , Supaaek Pramoonmak , Walanrak Poomchalit , Anin Memon

This study focuses on the fabrication and comprehensive evaluation of aluminum composite panels (ACPs) using low-density polyethylene (LDPE) and aluminum foil derived from beverage carton packaging waste, with kraft paper removed, as a sustainable core material. Mechanical, microstructural, and environmental properties of the panels were systematically investigated under various compression molding conditions to determine optimal processing parameters. Compression temperatures ranged from 190 °C to 210 °C and pressures from 10 MPa to 14 MPa. Panels were successfully fabricated without the use of adhesive resin, achieving maximum tensile and flexural strengths of approximately 56 MPa and 99 MPa, respectively, at 210 °C and 14 MPa. Microstructural analysis revealed a uniform distribution of aluminum and LDPE within the core, with void content ranging from 5 % to 6 %. Carbon footprint assessment showed that the compression molding process generated about 0.18 kg CO₂ per panel. The findings demonstrate that recycled beverage carton packaging waste is a viable, eco-friendly, and mechanically robust alternative for ACP core materials, offering a promising pathway toward sustainable composite panel manufacturing. Future research will focus on enhancing surface bonding, assessing long-term durability, and scaling up fabrication processes for industrial applications.

本研究的重点是利用低密度聚乙烯（LDPE）和从饮料纸箱包装废料中提取的铝箔，去除牛皮纸作为可持续核心材料，制作铝复合板（acp）并进行综合评价。在不同的压缩成型条件下，系统地研究了面板的力学、微观结构和环境性能，以确定最佳的加工参数。压缩温度范围为190℃至210℃，压力范围为10 MPa至14 MPa。在不使用胶粘剂树脂的情况下成功制造了面板，在210°C和14 MPa下分别达到了约56 MPa和99 MPa的最大拉伸和弯曲强度。显微组织分析表明，铝和LDPE在芯内分布均匀，空洞含量在5% ~ 6%之间。碳足迹评估表明，压缩成型过程产生约0.18公斤的二氧化碳每面板。研究结果表明，回收的饮料纸盒包装废弃物是一种可行的、环保的、机械坚固的ACP核心材料替代品，为可持续复合板制造提供了一条有希望的途径。未来的研究将集中在增强表面粘合、评估长期耐久性和扩大工业应用的制造工艺上。

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引用次数: 0

Coelacanth-scale inspired thin-ply composites for load-bearing applications 用于承载应用的腔棘鱼级启发薄层复合材料

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100667

Marcel Neubacher , Farida Touni , Kohei Yamada , Masaaki Nishikawa , Bodo Fiedler

Thin-ply composites are known for their superior in-situ strength and manufacturing quality, offering higher unnotched tensile and compressive strengths compared to conventional laminates. However, their damage suppression capability leads to increased notch sensitivity, where the delamination and matrix cracking mechanisms are suppressed. As a result, thin-ply laminates are limited in their use in critical load-bearing applications. To address this, bio-inspired Bouligand structures, defined by their helical fibre arrangements, have shown promise in reducing notch sensitivity through helicoidal matrix cracking and stress redistribution. This study explores the mechanical performance of partial Bouligand layups derived from biological fibre architectures observed on coelacanth fish scales, where fibrils reorient under load. An analytical stiffness-based optimization was performed to match the mechanical properties of the conventional [0°, ± 45°, 90°] (50 %, 40 %, 10 % load introduction layup used in bolted and riveted aircraft structures, while integrating the partial Bouligand structure. The weights of the two-layer fibres (30 gsm and 60 gsm) were investigated, resulting in different pitch and stack angles. Tensile and bearing tests were conducted to evaluate the influence of the partial Bouligand structure on bearing sensitivity. The results indicate that bio-inspired fibre orientation can improve load redistribution and damage tolerance in thin-ply laminates, making them compatible for off-axis and notched applications.

薄层复合材料以其优越的原位强度和制造质量而闻名，与传统层压板相比，提供更高的无缺口拉伸和抗压强度。然而，它们的损伤抑制能力导致缺口灵敏度增加，其中分层和基体开裂机制被抑制。因此，薄层层压板在关键承重应用中的使用受到限制。为了解决这个问题，由螺旋纤维排列定义的仿生Bouligand结构显示出通过螺旋基质开裂和应力重新分配来降低缺口灵敏度的希望。本研究探讨了部分Bouligand铺层的力学性能，这些铺层来源于在腔棘鱼鳞片上观察到的生物纤维结构，其中纤维在负载下重新定向。为了匹配螺栓和铆接飞机结构中使用的传统[0°，±45°，90°]（50%,40%，10%载荷引入铺设）的力学性能，同时集成部分Bouligand结构，进行了基于刚度的分析优化。研究了两层纤维（30gsm和60gsm）的重量，导致不同的间距和堆叠角度。通过拉伸和承载试验，评价了局部布利甘结构对承载灵敏度的影响。结果表明，仿生纤维取向可以改善薄层复合材料的载荷再分配和损伤容限，使其适用于离轴和缺口应用。

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引用次数: 0

Spectral method to determine the Tsai-Wu probability of failure of a composite laminate subjected to random vibrations 用谱法确定复合材料层合板在随机振动作用下的蔡武失效概率

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100683

Javier Sanz-Corretge , Thanh-Dam Pham , Luan Trinh , Paul G. Leahy

This work presents a spectral-based methodology for the probabilistic failure analysis of composite laminates subjected to zero-mean, stationary Gaussian random vibrations. The proposed approach efficiently computes both the probability density (PDF) and cumulative distribution functions (CDF) of nonlinear failure indices, using the Tsai–Wu criterion as a case study. By integrating the frequency response functions (FRFs) of the stress tensor components with the excitation’s power spectral density (PSD), the method constructs the complete covariance matrix of the stress field. This enables the definition of a joint multivariate Gaussian distribution of stresses, from which Monte Carlo sampling is performed to evaluate any nonlinear failure function.

The methodology is general and can be applied to any nonlinear stress function, such as von Mises stress, provided the structure remains linear and the excitation Gaussian. Validation is performed through finite element (FE) simulations of a composite plate with a central hole. The RMS von Mises stresses predicted by the proposed method closely match those obtained with the Segalman spectral approach implemented in ANSYS, confirming its correctness. Further comparison with time-domain transient simulations demonstrates excellent agreement in failure probabilities while achieving a computational speedup exceeding two orders of magnitude.

这项工作提出了一种基于频谱的方法，用于复合材料层压板遭受零均值，平稳高斯随机振动的概率失效分析。该方法以Tsai-Wu准则为例，有效地计算非线性失效指标的概率密度和累积分布函数。该方法通过将应力张量分量的频响函数（frf）与激励的功率谱密度（PSD）进行积分，构建应力场的完整协方差矩阵。这使得应力的联合多元高斯分布的定义，从蒙特卡罗采样执行评估任何非线性破坏函数。该方法是通用的，可以应用于任何非线性应力函数，如von Mises应力，只要结构保持线性和激励是高斯的。通过对带中心孔的复合材料板的有限元模拟进行了验证。该方法预测的RMS von Mises应力与ANSYS中实现的Segalman谱法计算结果吻合较好，验证了该方法的正确性。进一步与时域瞬态模拟的比较表明，在实现超过两个数量级的计算速度的同时，失效概率具有很好的一致性。

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引用次数: 0

A review on the yarn pull-out behavior of high-performance woven fabrics for impact resistance 高性能机织物抗冲击拔纱性能研究进展

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100658

Hanyuan Pan , Jinzheng Liu , Jiang Xie , Zhenyu Feng

High-performance woven fabrics have been widely used in transportation, military, and so on, due to their low density and superior mechanical properties. These structures are commonly exposed to impact loading, including bullets, fragments and blast waves. Yarn interaction is one of the key affecting the impact resistance of fabrics, and methods and results of aramid and ultra-high molecular weight polyethylene yarn pull-out test are mainly reviewed. The factors, including fabric configuration, pull-out speed, inter-yarn friction and so on, affecting the peak pull-out force (PPF) of yarn are summarized in detail. Moreover, the influencing mechanisms of these factors are discussed and revealed by comparison of previous studies. The results indicate that most factors have unified conclusions on the influence of PPF. However, Few conclusions still exist differences, such as whether the relationship of number of pulled yarns and PPF is liner or non-liner, but have been clarified in this paper. Furthermore, the influencing mechanism has become clearer after discussion, but so far, it still remains at the qualitative level. In future research, further standardization of yarn pull-out test is needed to obtain more comparable data. In addition, it is recommended to conduct more yarn pull-out research on the influencing results and mechanisms of these factors under dynamic loading.

高性能机织物以其低密度和优越的机械性能，在交通运输、军事等领域得到了广泛的应用。这些结构通常暴露在冲击载荷下，包括子弹、碎片和冲击波。纱线相互作用是影响织物抗冲击性能的关键之一，本文主要综述了芳纶和超高分子量聚乙烯纱线的拉拔试验方法和结果。详细总结了织物形态、抽拔速度、纱线间摩擦等因素对纱线最大抽拔力（PPF）的影响。并通过与前人研究的比较，探讨和揭示了这些因素的影响机制。结果表明，大多数因素对PPF的影响有统一的结论。然而，关于拉纱数与PPF的关系是线性关系还是非线性关系等少数结论仍存在分歧，本文对此进行了澄清。此外，经过讨论，其影响机制也更加清晰，但目前仍停留在定性层面。在今后的研究中，需要进一步规范抽纱试验，以获得更多可比较的数据。此外，建议对这些因素在动载下的影响结果和机理进行更多的拔纱研究。

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引用次数: 0

Eigenmode-based inverse identification and multi-parameter sensitivity analysis of flax/Elium® laminates from unidirectional to cross-ply configurations validation 基于特征模型的亚麻/Elium®层压板从单向到交叉配置验证的反识别和多参数灵敏度分析

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100682

Ameny Ketata , Zouhaier Jendli , Mondher Haggui , Abderrahim El Mahi , Anas Bouguecha , Mohamed Haddar

This article presents an extended validation of a previously developed inverse identification method, initially applied to unidirectional (UD) flax/Elium® laminates. The study aims to (i) confirm the robustness of the ply-level inverse approach under more complex cross-ply configurations and (ii) identify the dominant mechanical parameters influencing the vibration behavior of biocomposites beyond UD layouts. A comprehensive sensitivity analysis is conducted to assess the influence of material and geometrical parameters on the first seven vibration modes. While E1 and G12 predominantly govern the dynamic response in UD laminates, cross-ply configurations reveal additional influences from the transverse modulus E2 and interlaminar shear modulus G13. Enhanced coupling effects involving G12 are also observed. Structural variability is considered through parameters such as thickness and density, which reflect the heterogeneous nature of bio-based materials. A compensation mechanism is highlighted: increased thickness raises stiffness but also adds mass, partially offsetting frequency gains. The study demonstrates a progressive transition in dominant mechanical parameters across modes: lower modes (f1, f2) are controlled by E1, while higher modes become increasingly sensitive to G12, G13, and, to a lesser extent, E2. The proposed inverse method shows excellent agreement between simulated and experimental modal responses for both 4-ply and 8-ply laminates. The genetic algorithm converges toward realistic values—thickness between 3,03 mm and 3,17 mm and density around 1292 kg/m³—confirming the robustness of the approach. By accounting for both material variability and process-induced dispersion, the method contributes to more reliable modeling and optimized design of natural fiber composites.

本文提出了先前开发的反识别方法的扩展验证，最初应用于单向（UD）亚麻/Elium®层压板。该研究旨在(i)确认在更复杂的交叉铺层结构下铺层级逆方法的鲁棒性，以及（ii）确定在UD布局之外影响生物复合材料振动行为的主要力学参数。对材料和几何参数对前7种振型的影响进行了综合灵敏度分析。虽然E1和G12主导着UD层合板的动态响应，但横向模量E2和层间剪切模量G13对交叉层合板的动态响应有额外的影响。还观察到涉及G12的增强耦合效应。结构变异性是通过厚度和密度等参数来考虑的，这些参数反映了生物基材料的异质性。一个补偿机制被强调：增加的厚度提高了刚度，但也增加了质量，部分抵消了频率增益。研究表明，各模态的主要力学参数呈渐进式转变：较低的模态（f1, f2）受E1控制，而较高的模态对G12， G13越来越敏感，E2在较小程度上也越来越敏感。所提出的反方法表明，4层和8层复合材料的模拟模态响应与实验模态响应非常吻合。遗传算法收敛于实际值-厚度在3.03 mm和3.17 mm之间，密度在1292 kg/m³左右-证实了该方法的鲁棒性。该方法考虑了材料的可变性和工艺引起的分散，有助于更可靠的天然纤维复合材料建模和优化设计。

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引用次数: 0

A critical review on laser-assisted paint removal from carbon fibre-reinforced polymer: Insights into process parameters, material integrity, and numerical modelling 激光辅助去除碳纤维增强聚合物的油漆：对工艺参数、材料完整性和数值模拟的见解

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100654

Shiyao Zhu , Jojibabu Panta , Richard (Chunhui) Yang , Lin Ye , Y.X. Zhang

Laser-based paint stripping has emerged as a precise, efficient, and environmentally sustainable technique for removing paints/coatings from carbon fibre-reinforced polymer (CFRP) composites. This review presents a comprehensive analysis of laser-material interaction mechanisms that govern paint removal, including thermal ablation, thermally induced interfacial failure, plasma shock wave generation, and photochemical bond disruption. The influences of thermal and optical properties of CFRP and paint on interaction dynamics and removal behaviours are critically examined. The key laser processing parameters are systematically analysed in relation to stripping efficiency, substrate preservation, and thermal loading. Experimental methods used for monitoring process response and evaluating removal quality are also reviewed. Numerical modelling approaches based on the finite element method are discussed, with a focus on simulating transient heat transfer, interfacial stresses, and coupled effects. Limitations of current models in capturing the complexity of pulsed laser interaction with multilayered paint-composite structure are addressed. The review highlights that while laser stripping offers selective, damage-free paint removal, challenges remain in managing thermal effects, ensuring layer-specific selectivity, and achieving process scalability. Addressing these challenges is essential for translating laser-based stripping into reliable maintenance solutions for aerospace, defence, renewable energy, and automotive industries.

激光脱漆技术是一种精确、高效、环保的碳纤维增强聚合物（CFRP）复合材料脱漆技术。本文综述了影响涂料去除的激光与材料相互作用机制的综合分析，包括热烧蚀、热诱导界面破坏、等离子体冲击波产生和光化学键破坏。CFRP和涂料的热学和光学性质对相互作用动力学和去除行为的影响进行了严格的检查。系统地分析了激光加工的关键参数与剥离效率、衬底保存和热载荷的关系。本文还综述了用于监测过程响应和评价去除质量的实验方法。讨论了基于有限元方法的数值模拟方法，重点是模拟瞬态传热、界面应力和耦合效应。解决了当前模型在捕捉脉冲激光与多层涂料-复合材料结构相互作用的复杂性方面的局限性。该综述强调，虽然激光剥离提供了选择性、无损伤的油漆去除，但在管理热效应、确保层特异性选择性和实现工艺可扩展性方面仍然存在挑战。解决这些挑战对于将激光剥离转化为航空航天、国防、可再生能源和汽车行业的可靠维护解决方案至关重要。

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引用次数: 0

Quasi-static crushing analysis of doubly-curved sandwich shells with microlattice core: 3D-numerical simulation 微点阵双弯曲夹层壳的准静态破碎分析：三维数值模拟

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100672

Hosna Mahdavinia , Shahabeddin Hatami , Mojtaba Gorji Azandariani , Abbas Niknejad

Lightweight sandwich structures with microlattice cores have emerged as promising candidates for aerospace and automotive applications due to their high stiffness-to-weight ratio and superior energy-absorption capability. However, most previous studies have focused on flat configurations, and the mechanical response of doubly-curved sandwich shells with microlattice cores remains insufficiently explored. This study presents a numerical investigation into the quasi-static crushing behavior of flat and doubly-curved sandwich shells incorporating microlattice cores. The investigated structure consists of two metallic face-sheets bonded to a lightweight microlattice core with a body-centered cubic (BCC) topology, designed to enhance stiffness-to-weight ratio and energy absorption efficiency. Using finite element modeling with ABAQUS, nine distinct panel configurations were analyzed, varying in face-sheet thickness and curvature. The microlattice core was modeled using body-centered cubic (BCC) unit cells with both solid and beam elements, validated against experimental data. Results show that both curvature and face-sheet thickness significantly influence structural performance. Increased face-sheet thickness improves peak load capacity and stiffness, while doubly-curved panels exhibit enhanced load-bearing capacity compared to flat panels due to curvature-induced membrane stresses. The study establishes that doubly-curved sandwich shells with microlattice cores offer mechanical advantages over flat counterparts, especially when optimized for face-sheet thickness and curvature.

具有微晶格核心的轻质夹层结构由于其高刚度重量比和优异的能量吸收能力，已成为航空航天和汽车应用的有希望的候选者。然而，以往的研究大多集中在平面构型上，对微晶格核双弯曲夹层壳的力学响应研究尚不充分。本文对含有微点阵核的平面和双弯曲夹层壳的准静态破碎行为进行了数值研究。所研究的结构由两个金属面片连接到具有体心立方（BCC）拓扑的轻质微晶格核心组成，旨在提高刚度重量比和能量吸收效率。利用ABAQUS进行有限元建模，分析了9种不同的面板结构，它们的面板厚度和曲率都不同。微点阵核心采用体心立方（BCC）单元，采用实体单元和梁单元进行建模，并根据实验数据进行验证。结果表明，曲率和面板厚度对结构性能均有显著影响。增加的面板厚度提高了峰值载荷能力和刚度，而由于曲率引起的膜应力，双弯曲面板与平面面板相比具有更高的承载能力。该研究表明，与平面外壳相比，带有微晶格芯的双弯曲夹层外壳具有机械优势，特别是在对面板厚度和曲率进行优化时。

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引用次数: 0

Analysis of the compaction behavior of textile reinforcements in low-resolution in-situ CT scans via machine-learning and descriptor-based methods 基于机器学习和描述符的方法分析纺织品增强材料在低分辨率原位CT扫描中的压实行为

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100662

Christian Düreth , Jan Condé-Wolter , Marek Danczak , Karsten Tittmann , Jörn Jaschinski , Andreas Hornig , Maik Gude

A detailed understanding of material structure across multiple scales is essential for predictive modeling of textile-reinforced composites. Nesting — characterized by the interlocking of adjacent fabric layers through local interpenetration and misalignment of yarns — plays a critical role in defining mechanical properties such as stiffness, permeability, and damage tolerance. This study presents a framework to quantify nesting behavior in dry textile reinforcements under compaction using low-resolution computed tomography (CT). In-situ compaction experiments were conducted on various stacking configurations, with CT scans acquired at 20.22 µm per voxel resolution. A tailored 3D-UNet enabled semantic segmentation of matrix, weft, and fill phases across compaction stages corresponding to fiber volume contents of 50 % to 60 %. The model achieved a minimum mean Intersection-over-Union of 0.822 and an

F 1

score of 0.902. Spatial structure was subsequently analyzed using the two-point correlation function

S_{2}

, allowing for probabilistic extraction of average layer thickness and nesting degree. The results show strong agreement with micrograph-based validation. This methodology provides a robust approach for extracting key geometrical features from industrially relevant CT data and establishes a foundation for reverse modeling and descriptor-based structural analysis of composite preforms.

跨多个尺度的材料结构的详细了解是至关重要的纺织增强复合材料的预测建模。嵌套——其特点是相邻织物层通过纱线的局部穿插和错位而互锁——在确定机械性能（如刚度、渗透性和损伤容忍度）方面起着关键作用。本研究提出了一个框架来量化在低分辨率计算机断层扫描（CT）压实下干纺织增强材料的嵌套行为。在不同堆叠配置下进行了现场压实实验，CT扫描分辨率为20.22µm /体素。量身定制的3D-UNet可以在纤维体积含量为50%至60%的压实阶段对基质、纬纱和填充阶段进行语义分割。该模型的最小平均交复并度为0.822，F1得分为0.902。随后，利用两点相关函数S2对空间结构进行分析，从而实现平均层厚和嵌套度的概率提取。结果与基于显微照片的验证结果一致。该方法为从工业相关CT数据中提取关键几何特征提供了一种强大的方法，并为复合材料预成型的反向建模和基于描述符的结构分析奠定了基础。

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引用次数: 0