Characterization of damage onset mechanisms in 3D-woven composites by a novel in situ Eccentric Compression Bending test using x-ray computed tomography and acoustic emission

IF 7.1 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Salvador Orenes Balaciart, Yannick Pannier, Marco Gigliotti, David Mellier
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引用次数: 0

Abstract

This study introduces an innovative Eccentric Compression Bending (ECB) test designed for in situ tomography, aimed at isolating and characterizing the damage onset in 3D woven composites under bending loads. ECB testing facilitates damage analysis imposing a controlled eccentricity, which induces a bending-compression ratio suitable for real-time monitoring of damage initiation mechanisms using acoustic emission and x-ray computed tomography. Key advancements include a novel test setup and an interruption protocol based on AE to halt testing loads precisely at initial damage. The results highlight distinct damage initiation mechanisms for in-axis and off-axis specimens. In-axis specimens reveal initial damage in the form of intra-yarn transverse cracking under tensile stresses and yarn debonding under compression, while off-axis specimens show a complex array of matrix-dominated mechanisms, such as inter-yarn cracking and yarn-matrix debonding, under a multi-axial stress state.
利用x射线计算机断层扫描和声发射技术,通过一种新颖的原位偏心压缩弯曲试验来表征3d编织复合材料的损伤发生机制
本研究介绍了一种创新的偏心压缩弯曲(ECB)试验,该试验设计用于原位层析成像,旨在隔离和表征三维编织复合材料在弯曲载荷下的损伤发生。ECB测试有助于损伤分析,施加可控偏心,从而产生弯曲压缩比,适用于使用声发射和x射线计算机断层扫描实时监测损伤发生机制。关键的进步包括一种新的测试装置和基于声发射的中断协议,可以在初始损伤时精确地停止测试载荷。结果强调了轴内和离轴试样不同的损伤起裂机制。轴向试样在拉伸应力作用下表现为纱线内部横向开裂和压缩下的纱线脱粘,而轴向试样在多轴应力状态下表现为纱线间开裂和纱线-基体脱粘等复杂的基体主导机制。
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来源期刊
Composite Structures
Composite Structures 工程技术-材料科学:复合
CiteScore
12.00
自引率
12.70%
发文量
1246
审稿时长
78 days
期刊介绍: The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.
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