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
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.
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.