Thermoelastic analysis of the asymmetries of interfacial embedded delamination characteristics in laminated FRP composites
Thermoelastic analysis of the asymmetries of interfacial embedded delamination characteristics in laminated FRP composites
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DOI：
10.1016/j.compositesa.2006.03.012
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发表时间：
2007-02
影响因子：
8.7
通讯作者：
S. K. Panda;B. Pradhan
中科院分区：
文献类型：
--
作者：
S. K. Panda;B. Pradhan
本文对含界面椭圆脱层的FRP复合材料层合板进行了两组全三维热弹性有限元分析，着重研究了残余热应力和材料各向异性对脱层断裂行为的影响。基于线弹性断裂力学（LEFM）概念的修正裂纹闭合积分（MCCI）方法已被用作一种有意义的工具来计算热弹性应力场和位移场的应变能释放率的各个模式，这是由于热冲击载荷和准静态冲击载荷的组合。残余应力的开发，由于热弹性各向异性的层被发现强烈影响的脱层发生和传播特性，这已经反映了能量释放率图的性质和显着的变化沿着脱层前的不对称性。
This paper presents two sets of full three-dimensional thermoelastic finite element analyses of superimposed thermo-mechanically loaded FRP composite laminates with embedded interfacial elliptical delaminations, emphasizing the influence of residual thermal stresses and material anisotropy on the delamination fracture behavior characteristics. Modified crack closure integral (MCCI) methods based on the concepts of linear elastic fracture mechanics (LEFM) have been used as a meaningful tool to calculate the individual modes of strain energy release rates from the thermoelastic stress and displacement fields due to a combined thermal and a quasi-static impact loading. Residual stresses developed due to the thermoelastic anisotropy of the laminae are found to strongly influence the delamination onset and propagation characteristics, which have been reflected by the asymmetries in the nature of energy release rate plots and their significant variation along the delamination front.