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Failure Analysis of Fiber-Reinforced Composites Under Multiaxial Cyclic Stress

机译:纤维增强复合材料在多轴循环应力作用下的破坏分析

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摘要

A preliminary study on the fatigue failure of continuous fiber reinforced composites under multiaxial stress has been presented. A model used to predict the direction of the critical plane of composite laminae under multiaxial cyclic stress is developed. First, two types of planes in the unidirectional lamina are defined in order to discriminate the different failure mechanisms, i.e. fibre failure and inter-fibre failure. Based on planes of different types, the concept of effective stress is proposed to determine the direction of the critical plane. Second, fatigue experiments of filament wound composites under biaxial loading are carried out and the failure planes are described. Results show that the fracture planes in reality are close to the critical planes predicted by the model.
机译:提出了连续纤维增强复合材料在多轴应力下的疲劳破坏的初步研究。建立了用于预测复合材料薄层在多轴循环应力作用下临界面方向的模型。首先,在单向薄片中定义了两种类型的平面,以便区分不同的失效机理,即纤维失效和纤维间失效。基于不同类型的平面,提出了有效应力的概念来确定临界平面的方向。其次,进行了双轴加载下长丝缠绕复合材料的疲劳实验,并描述了破坏面。结果表明,实际中的断裂面接近模型预测的临界面。

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