Damage mechanism identification and failure behavior of 2D needle-punched SiCf/SiC composites based on acoustic emission and digital image correlation

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-25 DOI:10.1016/j.matchar.2024.114491

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引用次数: 0

Abstract

In order to improve the reliability of damage analysis for SiC_f/SiC composites, an identification method of damage mechanism was established by combining in-situ acoustic emission (AE) and digital image correlation (DIC). The corresponding failure behavior of 2D needle-punched SiC_f/SiC composites during ambient-temperature tensile test was investigated in detail. Through a machine learning k-means algorithm, AE signals could be effectively divided into five clusters: friction and sliding, interface damage, matrix cracking, individual fiber breaks and collective fiber breaks. DIC results show that the surface strain of composites increased non-uniformly during the tensile process, and the architecture of the composites had a significant influence on the initiation and propagation of cracks. To summarize, the tensile process consisted of three stages: the elastic stage, the rapid propagation of matrix cracks, the coordinated fiber fracture within the large strain bands. The failure of composites was dominated by the limited load transferring ability of the interface.

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基于声发射和数字图像相关性的二维针刺碳化硅/碳化硅复合材料的损伤机制识别和失效行为

为了提高碳化硅/碳化硅复合材料损伤分析的可靠性，结合原位声发射（AE）和数字图像相关（DIC）建立了一种损伤机理识别方法。详细研究了二维针刺碳化硅/碳化硅复合材料在常温拉伸试验中的相应破坏行为。通过机器学习 k-means 算法，AE 信号可以有效地分为五个群组：摩擦和滑动、界面损伤、基体开裂、单根纤维断裂和集体纤维断裂。DIC 结果表明，复合材料的表面应变在拉伸过程中不均匀地增加，复合材料的结构对裂纹的产生和扩展有重要影响。总之，拉伸过程包括三个阶段：弹性阶段、基体裂纹快速扩展阶段和大应变带内纤维协调断裂阶段。复合材料的失效主要受限于界面的载荷传递能力。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.