Composites Part B: Engineering最新文献_第7页

Multifunctional and multidimensional Na-ion structural coaxial energy storage cell 多功能多维钠离子结构同轴储能电池

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113431

Beatriz Arouca Maia , Federico Danzi , Raquel Miriam Santos , Maria Helena Braga

The seamless integration of energy storage into load-bearing structures represents a major step toward lightweight, multifunctional, and sustainable systems for next-generation electrification and digitalization. Here, we report a coaxial structural energy-storage cell capable of simultaneously withstanding mechanical loads and delivering stable electrochemical performance. The architecture consists of a carbon-fiber-reinforced polymer (CFRP) outer shell, a Cu electrode, a Na⁺ solid-state ferroelectric electrolyte, and an Al inner electrode, enabling direct coupling between electrochemical and mechanical responses. Scanning Kelvin Probe (SKP) mapping reveals a continuous electrochemical potential across the Na⁺-electrolyte/Al interface, indicative of efficient charge redistribution driven by Fermi-level differences. SKP and first-principles simulations confirm the formation of electric double-layer capacitors at both the Cu/electrolyte and CFRP/electrolyte interfaces. Three-point bending tests demonstrate retention of electrochemical function under deformation, with a flexural modulus of 59.8 ± 1.2 GPa and a maximum flexural stress of 397.1 MPa, while synchrotron X-ray micro-computed tomography verifies interfacial integrity. Systematic variation of the Al-rod radius reveals a strong geometric dependence of long-term voltage stability, with the 3-mm configuration achieving optimal ionic conductivity (54.0 μS cm⁻¹) and a dielectric constant exceeding 10⁷. Ab initio simulations reproduce the observed chemical potentials and confirm spontaneous ferroelectric polarization. These results establish a new class of ferroelectric-driven structural batteries that combine mechanical robustness, electrochemical stability, and scalable composite manufacturing.

将储能系统无缝集成到承重结构中，是迈向下一代电气化和数字化轻量化、多功能和可持续系统的重要一步。在这里，我们报道了一种同轴结构储能电池，能够同时承受机械载荷并提供稳定的电化学性能。该结构由碳纤维增强聚合物（CFRP）外壳、Cu电极、Na+固态铁电电解质和Al内电极组成，实现了电化学和机械响应之间的直接耦合。扫描开尔文探针（SKP）映射揭示了Na+-电解质/Al界面上连续的电化学电位，表明费米能级差异驱动的有效电荷再分配。SKP和第一性原理模拟证实了在Cu/电解质和CFRP/电解质界面上都形成了双电层电容器。三点弯曲试验表明，在变形下电化学功能保持不变，弯曲模量为59.8±1.2 GPa，最大弯曲应力为397.1 MPa，同步x射线微计算机断层扫描验证了界面的完整性。al棒半径的系统变化揭示了长期电压稳定性的几何依赖性，其中3-mm结构获得最佳离子电导率（54.0 μS cm−1）和介电常数超过107。从头算模拟再现了观察到的化学势，并证实了自发铁电极化。这些结果建立了一种新型的铁电驱动结构电池，它结合了机械稳健性、电化学稳定性和可扩展的复合制造。

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引用次数: 0

Impact damage characterization on CFRP parts using laser line scanning active thermography 用激光线扫描主动热成像技术表征CFRP零件的冲击损伤

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113425

Michał Sobczak , Julien Lecompagnon , Philipp Daniel Hirsch , Łukasz Pieczonka , Mathias Ziegler

This study presents a dual-path data processing framework for the detection and characterization of barely visible impact damage (BVID) in carbon-fiber-reinforced polymer (CFRP) structures using laser line thermography (LLT). A robotic LLT system was used to scan impacted CFRP specimens, and the resulting thermal sequences were analyzed using two complementary methods: full thermogram reconstruction followed by Pulse Phase Thermography (PPT) to detect subsurface delaminations, and Time-Summed Gradient Filtering (TSGF) to enhance surface-breaking cracks. Both processing paths produced interpretable results that were fused into a unified combined image and overlay mask, enabling simultaneous visualization of different defect types from a single scan. Quantitative analysis was performed on the binary masks to extract defect dimensions and Signal-to-noise ratio (SNR) values. The results demonstrated that delaminations and multiple cracks could be accurately detected and spatially distinguished, with good agreement to reference methods such as flash thermography and vibrothermography. This work highlights the potential of LLT as a versatile and scalable inspection technique, where multimodal defect detection and segmentation can be achieved through targeted processing and data fusion strategies.

本研究提出了一种双路径数据处理框架，用于使用激光线热成像（LLT）检测和表征碳纤维增强聚合物（CFRP）结构中几乎不可见的冲击损伤（BVID）。使用机器人LLT系统扫描受冲击的CFRP试样，并使用两种互补的方法分析产生的热序列：全热像图重建和脉冲相位热成像（PPT）来检测次表面分层，以及时间和梯度滤波（TSGF）来增强表面破碎裂纹。两种处理路径都产生了可解释的结果，这些结果被融合到一个统一的组合图像和覆盖掩模中，从而能够从一次扫描中同时显示不同的缺陷类型。对二值掩模进行定量分析，提取缺陷尺寸和信噪比。结果表明，该方法可以准确地检测到分层和多裂纹，并在空间上进行区分，与闪蒸热像仪和振动热像仪等参考方法一致。这项工作突出了LLT作为一种通用和可扩展的检测技术的潜力，其中可以通过有针对性的处理和数据融合策略实现多模态缺陷检测和分割。

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引用次数: 0

Eco-friendly aqueous sizing and carbon fiber activation: A dual-pronged strategy for synergistic interfacial enhancement and scalable manufacturing of CF/PEEK composites 环保型水性施胶和碳纤维活化：CF/PEEK复合材料协同界面增强和规模化制造的双管齐下策略

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113432

Mingyu Liu , ZhuYi Li , Meng Cao , Weiguo Su , Peng Jin , Shuo Wang

The weak interfacial adhesion between carbon fiber (CF) and polyether ether ketone (PEEK) composites results from the inherently inert surfaces and absence of reactive functional groups. In this work, a sustainable and scalable strategy has been developed to improve the CF/PEEK interface by combining surface-activated CF with a water-based sulfonated PEEK (SPEEK) sizing agent. First, the SPEEK with different sulfonation degrees were prepared by adjusting the reaction time. These SPEEK samples were then used as sizing agents and applied to CF that had been pretreated either with High-temperature (HCF) and Plasma-activation (PCF). The SPEEK coating exhibited strong adhesion to the fiber surfaces and significantly increased the polar component of surface energy, enhancing PEEK slurry impregnation. Notably, the PCF-SPEEK-I and PCF-SPEEK-IV methods demonstrated exceptional performance, achieving a 29.46 % increase in interlaminar shear strength and an 87.41 % improvement in interfacial shear strength compared to the untreated sample. To elucidate the underlying mechanisms, molecular dynamics simulations were conducted on the CF/SPEEK system. The results revealed that the compatibility between molten PEEK and SPEEK—driven by their similar solubility parameters and π-π interactions—facilitates a stable interface during processing. Furthermore, the interfacial shear energy of PCF/SPEEK was 105.28 % higher than that of UCF/PEEK. This enhancement is attributed to hydrogen bonding between the activated fiber's polar groups and SPEEK's sulfonic acid groups, which increases the energy required for shear. This study reveals the synergistic mechanism between surface-activated CF and SPEEK sizing agent, and it presents an environmentally friendly, scalable method for interfacial enhancement of CF/PEEK composites.

碳纤维（CF）与聚醚醚酮（PEEK）复合材料表面固有惰性和缺乏活性官能团是其界面粘附力弱的主要原因。在这项工作中，通过将表面活化的CF与水基磺化PEEK （SPEEK）施胶剂结合，开发了一种可持续且可扩展的策略来改善CF/PEEK界面。首先，通过调整反应时间制备不同磺化度的SPEEK；然后将这些SPEEK样品用作施胶剂，并将其应用于经高温（HCF）和等离子体活化（PCF）预处理的CF。SPEEK涂层对纤维表面具有很强的附着力，显著提高了表面能的极性组分，提高了PEEK浆料的浸渍率。值得注意的是，PCF-SPEEK-I和PCF-SPEEK-IV方法表现出优异的性能，与未经处理的样品相比，层间剪切强度提高了29.46%，界面剪切强度提高了87.41%。为了阐明其潜在机制，对CF/SPEEK体系进行了分子动力学模拟。结果表明，熔融PEEK和speek之间的相容性-由它们相似的溶解度参数和π-π相互作用驱动-有助于在加工过程中形成稳定的界面。PCF/SPEEK的界面剪切能比UCF/PEEK高105.28%。这种增强是由于活化纤维的极性基团和SPEEK的磺酸基团之间的氢键，这增加了剪切所需的能量。本研究揭示了表面活化CF与SPEEK施胶剂之间的协同作用机制，并提出了一种环保、可扩展的CF/PEEK复合材料界面增强方法。

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引用次数: 0

Significant enhancement of interfacial strength of overmolded CF/PEEK components via Co-Consolidation with an LM-PAEK interlayer 通过与LM-PAEK中间层共固结，显著增强了复模CF/PEEK组件的界面强度

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113429

Shuxu Bai , Yanrui Li , Zhijie Liu , Dong Quan , Jun Lin , Jia Liu , Xiangshan Kong , Guoqun Zhao

Injection molding of short carbon fiber (sCF)-reinforced thermoplastic composites onto continuous carbon fiber (cCF)-reinforced thermoplastic substrates has emerged as an advanced approach for the rapid manufacturing of aerospace components with complex geometries. However, the interfacial strength of overmolded joints is often constrained by insufficient molecular interdiffusion across the interface during molding. To overcome this limitation in carbon fiber reinforced polyetheretherketone (CF/PEEK) systems, a low-melting-point polyaryletherketone (LM-PAEK) resin interlayer (eRL) was co-consolidated onto the cCF/PEEK substrate prior to overmolding with sCF/PEEK, enabling the fabrication of T-shaped joints with enhanced interfacial integrity. Crucially, theoretical analysis based on a healing degree model revealed that the LM-PAEK interlayer enables substantial polymer chain diffusion (37.4 % healing degree) even without substrate preheating, whereas bare CF/PEEK exhibits negligible bonding (0 % healing) under the same conditions. Mechanical testing revealed that the incorporation of the eRL significantly increased bond strength, with average pull-off and lateral bending strengths improving by 62.9 % and 61.8 %, respectively, at the optimal substrate preheating temperature of 390 °C. Notably, effective interfacial bonding between the sCF/PEEK and cCF/PEEK composites was also achieved without substrate preheating. Moreover, further optimization of interfacial mechanical properties was accomplished by tailoring the interfacial area and eRL thickness. Overall, these results demonstrate that the introduction of an LM-PAEK interlayer provides a robust and efficient strategy for strengthening overmolding interfaces in thermoplastic composites, delivering both superior mechanical performance and enhanced processing flexibility.

在连续碳纤维（cCF）增强热塑性塑料基板上注射成型短碳纤维（sCF）增强热塑性复合材料已成为快速制造具有复杂几何形状的航空航天部件的一种先进方法。然而，过度模压接头的界面强度往往受到模压过程中分子在界面上的相互扩散不足的限制。为了克服碳纤维增强聚醚醚酮（CF/PEEK）系统的这一局限性，在与sCF/PEEK进行复模之前，将低熔点聚醚醚酮（LM-PAEK）树脂中间层（eRL）共固结在cCF/PEEK基板上，从而制造出具有增强界面完整性的t形接头。至关重要的是，基于愈合度模型的理论分析表明，即使没有衬底预热，LM-PAEK夹层也能实现大量聚合物链扩散（37.4%愈合度），而在相同条件下，裸CF/PEEK的键合可以忽略不计（0%愈合）。力学测试表明，在390°C的预热温度下，eRL的加入显著提高了结合强度，平均拉脱强度和横向弯曲强度分别提高了62.9%和61.8%。值得注意的是，在没有衬底预热的情况下，sCF/PEEK和cCF/PEEK复合材料之间也实现了有效的界面结合。此外，通过调整界面面积和eRL厚度，进一步优化界面力学性能。总的来说，这些结果表明，LM-PAEK中间层的引入为加强热塑性复合材料的覆盖界面提供了一种强大而有效的策略，提供了卓越的机械性能和增强的加工灵活性。

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引用次数: 0

Compression tunable acoustic foam composites enhanced by shear stiffening gels, shear thickening fluids, and CNTs 压缩可调声泡沫复合材料增强剪切硬化凝胶，剪切增稠流体和碳纳米管

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113430

Mohammad Rauf Sheikhi , Jian Li , Zihao Xie , Selim Gürgen

Porous acoustic foams are widely used for noise control but inherently lose sound absorption effectiveness when mechanically compressed, which significantly limits their performance in confined or load-bearing applications. To counteract this limitation, this study used open-cell foams impregnated with shear stiffening gels (SSGs) and shear thickening fluids (STFs), with and without carbon nanotube (CNT) reinforcement, to create innovative composite foams with tunable stiffness under deformation. A multi-faceted approach, including fabrication process, rheological analysis, microstructural and mechanical characterization, and comprehensive acoustic testing using an impedance tube, was employed. The results indicate that the macroscopic acoustic performance of the composites is controlled by the viscoelastic properties of the fillers. SSG-based composites, with a high storage modulus (G′), act as stiffness-controlled barriers. Their rigidity under low-to-moderate compression creates a significant acoustic impedance mismatch, resulting in high sound absorption and sound transmission loss (STL) and effective low-frequency (LF) reflection. In contrast, STF-based composites are managed by the loss modulus (G″) and dynamic viscosity, allowing them to maintain acoustically open viscous dissipation pathways even under severe compressive strains (60–80 %). This prevents the performance collapse seen in densified foams. Static compression serves as an external tuner, pre-stressing the additives to enhance stiffness in SSG or viscosity in STF. Across all conditions, CNT reinforcement further enhanced performance by increasing structural rigidity and promoting multi-scale sound scattering. Compared with untreated foams, the optimized composites delivered markedly greater LF attenuation, a range in which conventional porous materials typically perform poorly while retaining functionality under severe compression. These characteristics suggest potential for lightweight, multifunctional acoustic solutions in automotive, aerospace, and high-speed train applications, where installation space is constrained and sustained compressive loading is expected.

多孔吸声泡沫广泛用于噪声控制，但在机械压缩时固有地失去吸声效果，这大大限制了其在密闭或承重应用中的性能。为了克服这一限制，本研究使用了浸渍了剪切增强凝胶（SSGs）和剪切增稠流体（STFs）的开孔泡沫，并在有无碳纳米管（CNT）增强的情况下，制造出具有可调变形刚度的创新型复合泡沫。采用多方面的方法，包括制造工艺，流变分析，微观结构和力学特性，以及使用阻抗管进行综合声学测试。结果表明，复合材料的宏观声学性能受填料的粘弹性控制。ssg基复合材料具有高存储模量（G’），可作为刚度控制屏障。它们在低至中等压缩下的刚性会产生显著的声阻抗失配，从而导致高吸声和传声损失（STL）以及有效的低频反射（LF）。相比之下，stf基复合材料由损失模量（G″）和动态粘度来管理，即使在严重的压缩应变（60 - 80%）下，它们也能保持声学上开放的粘性耗散路径。这防止了致密泡沫中出现的性能崩溃。静态压缩作为外部调谐器，对添加剂施加预应力以提高SSG的刚度或STF的粘度。在所有条件下，碳纳米管加固通过增加结构刚度和促进多尺度声散射进一步提高了性能。与未经处理的泡沫相比，优化后的复合材料具有更大的低频衰减，而传统多孔材料在严重压缩下通常表现不佳，但仍能保持功能。这些特点表明，在汽车、航空航天和高速列车应用中，轻型、多功能声学解决方案具有潜力，这些应用的安装空间受到限制，并且需要承受持续的压缩载荷。

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引用次数: 0

Thermoplastic elastomer foams: Anti-shrinkage strategies toward dimensionally stable lightweight materials 热塑性弹性体泡沫：尺寸稳定的轻质材料的抗收缩策略

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113426

Qiqi Sun , Yang Sun , Xiaoyu Zhang , Zhaozhi Wang

Polymer foams, particularly thermoplastic elastomer (TPE) foams, have emerged as an important class of lightweight, flexible, and highly adaptable materials. Their ability to combine the resilience of the rubbers with the melt-processability of thermoplastics enables the production of foams with finely controlled micro-structures. These foams are increasingly used in energy-efficient systems, sound insulation, electromagnetic shielding, and thermal management, offering significant performance advantages due to their reduced density and customizable porosity. However, a major challenge limiting their broader application is post-foaming shrinkage, which leads to a loss of expansion ratio and distortion of the foam's geometry, particularly in applications requiring high dimensional stability. This review delves into the fundamental issues contributing to shrinkage and systematically discusses strategies to mitigate these effects, such as post-foaming gas displacement, structural regulation, physical or chemical modification strategies. This review comprehensively summarises the functionalized applications of lightweight polymer foams and reflects on the innovative development directions for the future of this field.

聚合物泡沫，特别是热塑性弹性体（TPE）泡沫，已经成为一种重要的轻量化、柔韧性和高适应性材料。它们将橡胶的弹性与热塑性塑料的熔融加工性相结合的能力，使生产具有精细控制微观结构的泡沫成为可能。这些泡沫越来越多地应用于节能系统、隔音、电磁屏蔽和热管理，由于其低密度和可定制的孔隙率，具有显著的性能优势。然而，限制其广泛应用的主要挑战是发泡后收缩，这会导致膨胀比的损失和泡沫几何形状的扭曲，特别是在需要高尺寸稳定性的应用中。这篇综述深入探讨了导致收缩的基本问题，并系统地讨论了减轻这些影响的策略，如发泡后气体置换、结构调节、物理或化学改性策略。本文综述了轻量化聚合物泡沫的功能化应用，并对该领域未来的创新发展方向进行了展望。

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引用次数: 0

Tailoring dual heterointerface structure in continuously extruded Al/steel/CF hybrid composites: Towards enhanced interfacial bonding performance 连续挤压Al/钢/CF混杂复合材料中定制双异质界面结构：增强界面结合性能

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113419

Zhen Zhang , Cunsheng Zhang , Zhenyu Liu , Jun Yan , Yingzhi Li , Liang Chen , Guoqun Zhao

To meet the two-way requirements of lightweight and high performance for aluminum matrix composites in engineering applications, inspired by multi-layer structural design, continuously steel-covered carbon fibers (CF) hybrid reinforced aluminum matrix composites with dual heterogeneous interfaces were fabricated through a novel composite extrusion process in this work. Subsequently, the effects of different heat treatment conditions on the structural characteristics and bonding properties of the Al/Steel/CF interface were investigated. Low-temperature heat treatments induce the formation of a unique nanoscale Mg–O amorphous layer at Al/steel interface and a multi-phase mixed transition zone at steel/CF interface. Specimens heat-treated at 200 °C and 300 °C exhibit superior interface bonding properties. Modified thermodynamic calculations indicate that the diffusion rate and chemical driving force of element Si rise with increasing temperature, and multi-layer structures of Fe₂(Al, Si)₅, Al₈Fe₂Si, and Mg–O mixed with Al₃Ni gradually form at Al/steel interface. When the temperature exceeds 350 °C, obvious microcracks and voids appear at the steel/CF interface. The formation of interfacial intermetallic compounds weakens the interface bonding, and the failure mode transforms into the dominant interface debonding between matrix and IMCs. The correlation between dual heterointerface structures, heat treatments, and bonding properties is established, providing a new strategy for obtaining high-performance lightweight aluminum composites.

为了满足铝基复合材料在工程应用中对轻量化和高性能的双重要求，受多层结构设计的启发，采用新型复合挤压工艺制备了具有双非均相界面的连续钢包碳纤维（CF）混杂增强铝基复合材料。随后，研究了不同热处理条件对Al/Steel/CF界面结构特征和结合性能的影响。低温热处理在Al/钢界面形成独特的纳米Mg-O非晶层，在钢/CF界面形成多相混合过渡区。在200°C和300°C热处理的试样表现出优异的界面结合性能。修正的热力学计算表明，随着温度的升高，Si元素的扩散速率和化学驱动力增大，在Al/steel界面逐渐形成Fe2(Al, Si)5、Al8Fe2Si、Mg-O与Al3Ni混合的多层结构。当温度超过350℃时，钢/CF界面出现明显的微裂纹和空洞。界面金属间化合物的形成削弱了界面键合，破坏模式转变为基体与IMCs之间的主要界面脱键。建立了双异质界面结构、热处理和键合性能之间的相关性，为获得高性能轻量化铝复合材料提供了新的策略。

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引用次数: 0

Rate effect and mechanism analysis of mode I interlaminar fracture toughness of CF/PEEK thermoplastic composites CF/PEEK热塑性复合材料I型层间断裂韧性速率效应及机理分析

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-19 DOI: 10.1016/j.compositesb.2026.113423

Jiadong Wang , Debin Song , Zhen Liu , Chao Zhang , Jia Huang , Yulong Li

While increasingly used in aerospace, the dynamic interlaminar fracture toughness of high-performance thermoplastic composites like CF/PEEK is not well quantified, which limits the accurate simulation and prediction of their delamination behavior under dynamic loading. This study quantified the rate effect of Mode I interlaminar fracture toughness of CF/PEEK unidirectional laminates under different loading rates, and introduced dynamic crack tip temperature rise into the analysis of underlying mechanisms for the first time. Quasi-static and dynamic fracture tests were conducted using an electronic universal testing machine and a bidirectional electromagnetic Hopkinson bar respectively. The results indicated that the Mode I fracture toughness of CF/PEEK exhibits slight positive sensitivity to crack propagation velocity, and its rate-dependent parameters are much smaller than those of thermosetting CF/epoxy. Fracture surface morphology observation revealed the transformation of fracture mechanisms under quasi-static and dynamic conditions, and obvious temperature rise at the crack tip was observed during dynamic crack propagation. It can thus be inferred that the weak rate effect of the interlaminar fracture toughness of CF/PEEK may originate from the coupling effect between the strengthening effect induced by the transition from fiber debonding to matrix fracture under high strain rate loading, and the softening effect caused by local temperature rise. This study provides reliable parameters and a theoretical basis for the accurate modeling of the dynamic delamination behavior of advanced thermoplastic composites for engineering applications.

CF/PEEK等高性能热塑性复合材料在航空航天领域的应用越来越广泛，但其动态层间断裂韧性尚未得到很好的量化，这限制了其动态载荷下分层行为的准确模拟和预测。本研究量化了不同加载速率下CF/PEEK单向层压板I型层间断裂韧性的速率效应，并首次将动态裂纹尖端温升引入其断裂机理分析。采用电子万能试验机和双向电磁霍普金森杆分别进行了准静态和动态断裂试验。结果表明：CF/PEEK的I型断裂韧性对裂纹扩展速度有轻微的正敏感性，其速率相关参数远小于热固性CF/环氧树脂；断口形貌观察揭示了准静态和动态条件下断裂机制的转变，动态裂纹扩展过程中裂纹尖端出现明显的温升。由此可以推断，CF/PEEK层间断裂韧性的弱速率效应可能源于高应变速率加载下纤维脱粘向基体断裂转变所产生的强化效应与局部温升所产生的软化效应的耦合效应。该研究为工程应用的高级热塑性复合材料动态分层行为的精确建模提供了可靠的参数和理论基础。

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引用次数: 0

Numerical and experimental study of textile-cement bonding: fiber types and textile orientation in casting 纺织-水泥粘合的数值与实验研究：纤维类型与纺织取向

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-18 DOI: 10.1016/j.compositesb.2026.113421

Olga Sinitsky , Elad Priel , Alva Peled

The bond between textile reinforcement and the cement matrix plays a critical role in the overall mechanical performance of textile-reinforced concrete (TRC) composites. In this research, an integrated methodology of experiments and numerical analysis is used to examine how fiber type and textile orientation during casting influence the bonding in TRC. Polymer-impregnated carbon and glass fiber bundles, with comparable cross-sectional areas, were embedded in cement at varying lengths and with their cross sections oriented either horizontally or vertically to gravity. Pull-out tests were conducted, and orientation-dependent finite element (FE) models were developed to determine cohesive strength parameters and to validate them against experimental data. The results indicate that the use of carbon fibers provides higher maximum pull-out loads compared to glass fibers. Vertical orientation enhances the pull-out load relative to horizontal orientation. Micrograph analysis highlights distinct failure mechanisms influenced by reinforcement orientation. FE model simulations support the experimental findings, revealing an asymmetric bundle–matrix adhesion of fiber bundles oriented horizontally. The proposed model predicts pull-out behavior across different embedded lengths at a shear strength of 6.5 MPa, confirms the experimentally observed nonlinear relationship between pull-out loads and embedded lengths, and offers insights into material and design factors influencing the reliability of TRC.

纺织增强材料与水泥基体之间的粘结对纺织增强混凝土复合材料的综合力学性能起着至关重要的作用。在本研究中，采用实验和数值分析相结合的方法来研究纤维类型和纺织取向在铸造过程中对TRC粘合的影响。聚合物浸渍的碳和玻璃纤维束具有相当的截面积，以不同的长度嵌入水泥中，其横截面可水平或垂直于重力方向。进行了拔出试验，并建立了与方向相关的有限元（FE）模型，以确定内聚强度参数，并根据实验数据对其进行验证。结果表明，与玻璃纤维相比，碳纤维的使用提供了更高的最大拉出载荷。相对于水平方向，垂直方向增大了拉出载荷。显微图分析突出了受强化取向影响的不同破坏机制。有限元模型模拟结果支持实验结果，揭示了水平方向纤维束的不对称束-基质粘附。该模型预测了在剪切强度为6.5 MPa时不同埋置长度下的拉拔行为，证实了实验观察到的拉拔载荷与埋置长度之间的非线性关系，并为影响TRC可靠性的材料和设计因素提供了见解。

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引用次数: 0

Enhanced hydrogen barrier of a modified mica/epoxy coating under varied temperatures and pressures 改性云母/环氧涂料在不同温度和压力下的氢阻隔性增强

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2026-01-18 DOI: 10.1016/j.compositesb.2026.113424

Yan Gao, Hongguang Dong, Ke Wang, Wei Gao

The development of hydrogen barrier composite resin coatings with low-cost and high-performance under diverse service conditions is crucial for safe and efficient hydrogen storage and transportation, particularly in pipeline systems. In this work, a modified mica/epoxy composite coating with a continuous and dense “maze effect” structure was developed, and the hydrogen barrier performance was systematically evaluated using an in situ gas-phase hydrogen permeation testing method under conditions of 5–50 °C and 0.1–4.0 MPa. The results demonstrated that the composite coating containing 40 wt% modified mica exhibited optimal performance, with a hydrogen permeability coefficient (P₁) of 36.162 cm³ mm/(m²·24 h·0.1 MPa) at 25 °C and 0.1 MPa. Within the temperature range of 5–50 °C at 0.1 MPa, the permeability coefficient of the composite coating followed typical Arrhenius behavior with temperature, and the fitted relationship was lnP₁ = −3.22 × 1000/T + 14.38, enabling the prediction of permeation performance over this range. At 25 °C, the permeability coefficient decreased and then stabilized as pressure increased from 0.1 to 4.0 MPa, reaching a hydrogen permeability coefficient of 25.324 cm³ mm/(m²·24 h·0.1 MPa) at 4.0 MPa. Moreover, the composite coating demonstrated significantly lower sensitivity to temperature and pressure variations compared to the pure epoxy resin, maintaining stable hydrogen barrier performance under complex conditions, mainly due to the “maze effect” structure of the layered mica, restricting polymer chain mobility and free volume variations. This study provides an effective strategy for the development and application of engineering-oriented hydrogen barrier coatings.

开发低成本、高性能、多种使用条件下的氢屏障复合树脂涂料对于安全高效的氢气储存和运输，特别是在管道系统中至关重要。本文研制了一种具有连续致密“迷宫效应”结构的改性云母/环氧复合涂层，并在5-50℃、0.1-4.0 MPa条件下，采用原位气相氢渗透测试方法系统评价了其隔氢性能。结果表明，含改性云母40 wt%的复合涂层性能最佳，在25℃、0.1 MPa下，其氢渗透系数（P1）为36.162 cm3 mm/（m2·24 h·0.1 MPa）。在5 ~ 50℃0.1 MPa的温度范围内，复合涂层的渗透系数随温度的变化符合典型的Arrhenius行为，拟合关系为lnP1 =−3.22 × 1000/T + 14.38，可以预测该范围内的渗透性能。在25℃时，随着压力从0.1 MPa增加到4.0 MPa，渗透系数先减小后稳定，在4.0 MPa时达到25.324 cm3 mm/（m2·24 h·0.1 MPa）。此外，与纯环氧树脂相比，复合涂层对温度和压力变化的敏感性明显降低，在复杂条件下仍能保持稳定的氢屏障性能，这主要是由于层状云母的“迷宫效应”结构限制了聚合物链迁移率和自由体积变化。该研究为面向工程的氢障涂层的开发和应用提供了有效的策略。

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