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Mixed-mode analysis of superimposed thermo-elastic effects in fiber-reinforced composites with embedded interface delaminations

机译：嵌入界面分层的纤维增强复合材料叠加热弹性效应的混合模式分析

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摘要

This paper deals with the 3D finite element analysis of superimposed thermo-elastic effect on embedded interfacial delamination crack growth characteristics in fiber-reinforced laminated composites. Interlaminar fracture at the delamination front is found to be a mixed-mode phenomenon due to the anisotropy and heterogeneity of thermo-physical properties of composite materials. This leads to the requirement of finite element evaluation of energy release rates, based on the principles of linear elastic fracture mechanics. The strain energy release rate components along the delamination front due to a uniform temperature drop, during the manufacturing stages of composite laminates, to room temperature and subsequent mechanical loading is obtained by superimposing their respective effects based on the assumptions of linear elasticity. Numerical calculations are carried out for multi-layered cross-ply and angle-ply composite laminates and energy release rate plots demonstrate large asymmetries along the delamination front due to the interaction of residual stresses and superimposed transverse loading.
机译：本文对纤维增强层合复合材料中叠加的热弹性效应对嵌入界面分层裂纹扩展特性的3D有限元分析进行了研究。由于复合材料的各向异性和热物理性质的异质性，在分层前的层间断裂被发现是一种混合模式现象。这导致需要基于线性弹性断裂力学原理的能量释放速率的有限元评估。通过在线性复合材料的假设基础上叠加它们各自的作用，可以在复合材料层压板的制造阶段中，沿着均匀的温度下降，沿着分层前沿的应变能释放速率分量达到室温，并获得随后的机械载荷。对多层交叉层和角层复合层压板进行了数值计算，能量释放速率图显示，由于残余应力和叠加的横向载荷的相互作用，沿分层前缘存在较大的不对称性。

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