In situ characterization of the damage mechanisms during tensile deformation in sustainable Flax-PP spread-tow woven composites

IF 2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Alexia Chabot, Thibaut Motteu, Jérémy Chevalier, Stéphane Godet
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引用次数: 0

Abstract

Due to current challenges related to global warming and the ecological impact of materials, the industry is considering natural-fibre-reinforced thermoplastic composites for their low weight and sustainability. However, to be considered for structural applications, their mechanical behaviour and damage mechanisms need to be fully understood. Regarding Flax-Polypropylene (Flax-PP) composites, damage mechanisms are successfully identified in the literature; however, their initiation and propagation up to final failure are not well described yet. The present study focuses on a spread-tow woven Flax-PP composite and aims to investigate the damage mechanisms and their evolution in two configurations — namely with fibres of the top ply being either parallel or perpendicular to the loading direction. The damage mechanisms are first identified via SEM analysis of fracture surfaces after standard tensile testing. Then, for both configurations, the evolution of damage mechanisms is studied by in situ SEM micro-tensile testing. In both cases, crack initiation at fibre tips and fibre debonding is the primary failure mechanisms, leading to subsequent fibre pullout and preferred crack path. Results show that the crack path is more in the case of top ply fibres parallel to the loading direction than in the case of transversal fibres. The greater occurrence of fibre pullout compared to fibre breakage is attributed to the weak interfacial strength between the fibres and the matrix, which is typical for natural fibre composites. The present study used in situ investigation to propose a detailed sequence of damage evolution related to tensile loading.

可持续亚麻- pp展拖编织复合材料拉伸变形损伤机理的原位表征
由于当前与全球变暖和材料生态影响相关的挑战,该行业正在考虑使用天然纤维增强热塑性复合材料,因为它们重量轻,可持续性好。然而,为了考虑结构应用,它们的力学行为和损伤机制需要充分了解。对于亚麻-聚丙烯(亚麻- pp)复合材料,损伤机制已在文献中成功确定;然而,它们的发生、发展直至最终失效的过程尚未得到很好的描述。本研究的重点是一种展束编织亚麻- pp复合材料,旨在研究两种配置下的损伤机制及其演变——即顶层纤维平行或垂直于加载方向。在标准拉伸试验后,通过对断口表面的扫描电镜分析,首先确定了损伤机制。然后,通过原位SEM微拉伸测试研究了两种结构的损伤机制演变。在这两种情况下,纤维尖端的裂纹萌生和纤维脱粘是主要的破坏机制,导致随后的纤维拉拔和首选裂纹路径。结果表明:与加载方向平行的顶层纤维的裂纹路径比横向纤维的裂纹路径多;与纤维断裂相比,纤维拔出的发生更大是由于纤维与基体之间的界面强度较弱,这是天然纤维复合材料的典型特征。本研究采用原位调查,提出了与拉伸载荷相关的损伤演化的详细序列。
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
CiteScore
8.60
自引率
0.00%
发文量
1
审稿时长
13 weeks
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