Abstract This paper investigates the torsion progressive damage and failure mechanism of two-dimensional (2D) braided carbon/epoxy composite tubes. Four kind of samples with four braiding angles, 30°, 45°, 55°, and 60°, are experimentally tested on the static torsion machine. Three-dimensional digital image correlation (3D-DIC) is utilized to monitor the progressive torsional strain and the crack propagation. Also, Micro-computer tomography (Micro-CT) is employed to describe the volume of damages and the torsional damage morphologies inside the specimens. Results indicate that the braiding angle has a significant effect on the torsional mechanical behaviors. Furthermore, the damage modes of 30° and 60° specimens are mainly influenced by the accumulation of the matrix damage, whereas those of 45° and 50° ones are largely dominated by the fiber tows breakage.

中文翻译：

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基于数字图像校正和X射线显微断层扫描的二维编织复合管扭转损伤机理分析

摘要 本文研究了二维（2D）编织碳/环氧树脂复合管的扭转渐进损伤和失效机制。在静态扭力机上对4种编织角30°、45°、55°和60°的四种样品进行了实验测试。三维数字图像相关（3D-DIC）用于监测渐进扭转应变和裂纹扩展。此外，采用微计算机断层扫描（Micro-CT）来描述标本内部的损伤体积和扭转损伤形态。结果表明，编织角度对扭转力学行为有显着影响。此外，30°和60°试样的损伤模式主要受基体损伤累积的影响，