Recent increases in the use of carbon fiber reinforced plastics, especially for high-temperature applications, has induced new challenges in evaluating their mechanical properties. The effects of temperature on the shear performance of 3-dimensional orthogonal and 2-dimensional plain woven composites were compared in this study through double-notch shear tests. A scanning electron microscope was employed to investigate the fiber/matrix interface properties to reveal the failure characteristics. The results showed that temperature had a visible impact on the inter-laminar shear strength (ILSS), deformation modes, and failure mechanism. The ILSS decreased as temperature increased, which was caused by the degradation of the matrix properties and fiber/matrix interface properties at high temperature. A finite element model was established to analyze the transient deformation process and the damage mechanism of the 3D orthogonal woven composite. This indicated that Z-binder yarns could improve the delamination resistance of 3D orthogonal woven composites, especially under high temperatures. The changes in failure modes of the 3D orthogonal woven composites was put down to thermal softening of the epoxy resin caused by high temperature and the undulation of the yarns.

中文翻译：

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温度对 3D 正交编织复合材料层间剪切性能和失效机制的影响

最近碳纤维增强塑料的使用增加，尤其是在高温应用中，给评估其机械性能带来了新的挑战。本研究通过双缺口剪切试验比较了温度对 3 维正交和 2 维平纹编织复合材料剪切性能的影响。使用扫描电子显微镜研究纤维/基体界面特性以揭示失效特征。结果表明，温度对层间剪切强度（ILSS）、变形模式和破坏机制有明显的影响。ILSS随着温度的升高而降低，这是由于高温下基体性能和纤维/基体界面性能的退化造成的。建立了有限元模型来分析3D正交编织复合材料的瞬态变形过程和损伤机制。这表明Z-binder纱线可以提高3D正交编织复合材料的抗分层性，尤其是在高温下。3D正交编织复合材料失效模式的变化归因于高温和纱线波动引起的环氧树脂热软化。