Effect of micro-scale fibre uncertainties on the mechanical behaviour of natural/synthetic hybrid fibre composites

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING Composites Part A: Applied Science and Manufacturing Pub Date : 2024-11-01 DOI:10.1016/j.compositesa.2024.108570

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Abstract

This paper investigates how uncertainties in natural/synthetic hybrid fibre composites—specifically fibre distribution, diameter, and elastic properties—affect the lamina properties and micro-stress distributions. Using a representative volume element model and Monte Carlo simulations, the study examines unidirectional flax/E-glass/epoxy and flax/epoxy composite laminae. Flax fibre uncertainties are modelled as normal distributions with a 20% coefficient of variation. Results reveal that these uncertainties minimally influence the homogenised properties of flax/epoxy laminae. However, in flax/E-glass/epoxy laminae, E-glass fibres significantly alter homogenised properties, with fibre elastic properties uncertainties having a greater effect. These uncertainties also influence matrix stress fields in flax/epoxy laminae, primarily due to uncertainties in fibre elastic properties. Although the influence is smaller in flax/E-glass laminae, it remains significant, as hybridisation can increase von Mises stress and potentially cause early resin cracking. This stochastic approach highlights the importance of micro-scale fibre uncertainties for damage analysis despite their limited influence on homogenised properties.

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微尺度纤维不确定性对天然/合成混合纤维复合材料机械性能的影响

本文研究了天然/合成混合纤维复合材料中的不确定因素（特别是纤维分布、直径和弹性特性）对层状结构特性和微应力分布的影响。该研究使用具有代表性的体元模型和蒙特卡罗模拟，对单向亚麻/玻璃纤维/环氧树脂和亚麻/环氧树脂复合材料层压板进行了研究。亚麻纤维的不确定性被模拟为正态分布，变异系数为 20%。结果表明，这些不确定性对亚麻/环氧层压板的均匀特性影响很小。然而，在亚麻/E-玻璃/环氧层压板中，E-玻璃纤维会显著改变均匀特性，而纤维弹性特性的不确定性影响更大。这些不确定性也会影响亚麻/环氧层压板的基体应力场，主要是由于纤维弹性特性的不确定性。虽然这种影响在亚麻/环氧玻璃层压板中较小，但仍然很重要，因为杂化会增加冯米塞斯应力，并可能导致早期树脂开裂。这种随机方法强调了微尺度纤维不确定性对损伤分析的重要性，尽管它们对均质特性的影响有限。

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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.