Translaminar fracture in (non–)hybrid thin-ply fibre-reinforced composites: An in-depth examination through a novel mini-compact tension specimen compatible with microscale 4D computed tomography

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING Composites Part A: Applied Science and Manufacturing Pub Date : 2024-10-15 DOI:10.1016/j.compositesa.2024.108529

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Abstract

Translaminar fracture toughness is pivotal for notch sensitivity and damage tolerance of fibre-reinforced composites. Hybridisation offers a promising pathway for enhancing this parameter in thin-ply composites. Three novel mini-compact tension specimen geometries were investigated for their competence in microscale characterisation of translaminar fracture using in-situ synchrotron radiation computed tomography (SRCT). Only “mini-protruded” design resulted in stable crack propagation with adequate crack increments. Based on this design, five baseline and hybrid cross-ply configurations incorporating low- and high-strain carbon fibres were studied. Crack propagation in low- and high-strain baseline configurations was stable. For interlayer and intrayarn fibre-hybrid configurations, a correlation between load–displacement curves and delamination is observed. The SRCT data confirmed that 90° ply-blocks cushion the interaction between 0° plies, enabling independent fracture. Additionally, crack fronts in 90° plies advance further than those in 0° plies. Moreover, mechanical interlocking and bundle bending within 0° plies serve as supplementary mechanisms for energy dissipation.

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非）混合薄层纤维增强复合材料的横向断裂：通过与微尺度 4D 计算机断层扫描兼容的新型微型紧凑拉伸试样进行深入研究

横向断裂韧性对于纤维增强复合材料的缺口敏感性和损伤耐受性至关重要。杂化技术为提高薄层复合材料的这一参数提供了一条很有前景的途径。研究人员利用原位同步辐射计算机断层扫描（SRCT）技术，对三种新型微型紧凑拉伸试样的几何形状进行了研究，以确定它们在微观尺度上表征层间断裂的能力。只有 "微型凸出 "设计能产生稳定的裂纹扩展和足够的裂纹增量。在此设计基础上，研究了包含低应变和高应变碳纤维的五种基线和混合交叉层配置。低应变和高应变基线配置的裂纹扩展都很稳定。对于层间和纱内纤维混合配置，可以观察到载荷-位移曲线与分层之间的相关性。SRCT 数据证实，90°层间隙可缓冲 0° 层间的相互作用，从而实现独立断裂。此外，90°层间的裂纹前沿比 0° 层间的裂纹前沿更远。此外，0°层内的机械互锁和束状弯曲也是能量消耗的辅助机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composites Part A: Applied Science and Manufacturing 工程技术-材料科学：复合

CiteScore

15.20

自引率

5.70%

发文量

492

审稿时长

30 days

期刊介绍： Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.