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Modelling of thermoplastic polymer failure in fiber reinforced composites

机译:纤维增强复合材料中热塑性聚合物破坏的建模

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摘要

The paper proposes a material model that characterizes the plastic behavior and damage accumulation in thermoplastic matrix in dependence on the type of the stress state that the matrix undergoes during loading. The model is applied (1) to the case of transversal tension loading of periodic cells of unidirectional composites with random spacing of fibers and (2) to the analysis of interface failure during fiber pull out tests. The first case validates the theory on the base of the experimental data for PEEK carbon reinforced composites. In the second case it is shown that in the interface area, with increase of plasticity deformations, the matrix material displays strengthening effect due to changes of stress state type. All constants required for stress analysis are given in terms of standard models embedded in well-known commercial FEM suites. (C) 2016 Elsevier Ltd. All rights reserved.
机译:本文提出了一种材料模型,该材料模型可根据基体在加载过程中承受的应力状态的类型来表征热塑性基体的塑性行为和损伤累积。该模型适用于(1)具有纤维随机间距的单向复合材料的周期单元的横向拉伸载荷情况,以及(2)用于纤维拔出测试期间的界面破坏分析。第一种情况基于PEEK碳增强复合材料的实验数据验证了该理论。在第二种情况下,表明在界面区域,随着塑性变形的增加,由于应力状态类型的变化,基体材料显示出增强作用。应力分析所需的所有常数都是根据嵌入在著名的商业FEM套件中的标准模型给出的。 (C)2016 Elsevier Ltd.保留所有权利。

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