Cluster analysis of acoustic emission signals for bending damage mechanism of flax fiber reinforced composites under hydrothermal aging

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2024-11-19 DOI:10.1016/j.coco.2024.102165

Jieyu Chen , Lulu Lei , Chao Ji , Sixian Yang , Zefei Cheng , Jinhong Fan , Tao Yu

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Abstract

Despite the eco-friendly and lightweight features, natural fiber reinforced composites (NFRCs) are more susceptible under hydrothermal conditions than artificial synthesis fibers reinforced composites. Cluster analysis on damage evolution of hydrothermal aged NFRCs by using acoustic emission techniques and machine learning also remains scare. To figure out these challenges, unidirectional flax fiber reinforced composites (FFRCs) were prepared and submerge into distilled water at three different temperatures to systematically study the influence and damage mechanism under hydrothermal aging by acoustic emission (AE). After hydrothermal aging for 60 days, AE signals revealed that the FFRCs were more likely to cause defects in the early loading stage at the higher temperature. Cluster analysis showed an increase in the proportion of delamination during the process of failure. The proportion of fiber breakage AE signals with higher PF also increased. Microscope view proved the bending damage behavior of FFRCs after hydrothermal aging.

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水热老化条件下亚麻纤维增强复合材料弯曲损伤机制的声发射信号聚类分析

尽管天然纤维增强复合材料（NFRC）具有环保和轻质的特点，但与人工合成纤维增强复合材料相比，它们在水热条件下更容易受到影响。利用声发射技术和机器学习对水热老化的天然纤维增强复合材料的损伤演变进行聚类分析也仍然是个难题。为了解决这些难题，研究人员制备了单向亚麻纤维增强复合材料（FFRC），并将其浸入三种不同温度的蒸馏水中，通过声发射（AE）系统地研究了水热老化的影响和损伤机制。水热老化 60 天后，声发射信号显示，在较高温度下，FFRC 在加载早期更容易产生缺陷。聚类分析显示，在失效过程中分层比例增加。PF 越高，纤维断裂 AE 信号的比例也越高。显微镜观察证明了水热老化后 FFRC 的弯曲损伤行为。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.