Mixed-mode I+II fracture behaviour of thermoplastic composites and their adhesive bonded joints

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology Pub Date : 2025-08-20 DOI:10.1016/j.compscitech.2025.111349

J.P. Reis , M.F.S.F. de Moura

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Abstract

In this work, a comprehensive experimental and numerical investigation of the fracture behaviour of carbon fibre-reinforced polyamide 6 thermoplastic composite materials is presented, considering both bulk laminates and adhesive bonded joints under pure and mixed-mode I + II loading conditions. Five fracture test configurations were employed allowing broad coverage of the G_I–G_II space. Due to the low surface energy of thermoplastic composites, an optimized two-part acrylic adhesive (3M™ DP8805 NS) was chosen to improve bonding performance. To address unstable crack propagation beyond the loading point observed in some tests, an extended version of the Compliance-Based Beam Method (CBBM) was developed. A finite element model incorporating cohesive zone modelling (CZM) with a trapezoidal law was used for validation procedure. The obtained fracture envelopes revealed that while bulk laminates maintain nearly constant toughness across the entire mode mixity range, bonded joints exhibit strong degradation under mode I influence.

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热塑性复合材料及其粘结接头的I+II混合模式断裂行为

在这项工作中，对碳纤维增强聚酰胺6热塑性复合材料在纯和混合模式I + II加载条件下的断裂行为进行了全面的实验和数值研究，同时考虑了散装层压板和粘合接头。采用了五种压裂测试配置，可以广泛覆盖gi - gi空间。由于热塑性复合材料的表面能较低，选择了一种优化的两组分丙烯酸粘合剂（3M™DP8805 NS）来提高粘合性能。为了解决在一些试验中观察到的加载点以外的不稳定裂纹扩展问题，开发了基于柔度的梁法（CBBM）的扩展版本。采用具有梯形律的内聚区建模（CZM）有限元模型进行验证。所获得的断裂包络线表明，尽管体层合板在整个模态混合范围内保持几乎恒定的韧性，但在模态I的影响下，粘结接头表现出强烈的退化。

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来源期刊

Composites Science and Technology 工程技术-材料科学：复合

CiteScore

16.20

自引率

9.90%

发文量

611

审稿时长

33 days

期刊介绍： Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites. Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.