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应用改进的虚裂纹闭合技术对热、力载荷作用下多材料构件连接区界面进行断裂分析。首先,通过对含橡胶夹层的复合材料层合板单腿弯曲(SLB)试件断裂分析,研究了在不同温度载荷作用下,橡胶夹层对试件能量释放率及其各型分量的影响。其次,对具有热流边界下,典型复合材料-橡胶-金属组成的多材料圆柱壳体连接裙结构进行了热力耦合断裂分析,结果表明裂纹总能量释放率随温度升高而增大。最后,针对该连接裙结构讨论了裂纹位置和橡胶层厚度对裂纹能量释放率的影响,指出适当增加橡胶层厚度可以降低裂纹能量释放率,但橡胶厚层度与界面韧性之间存在尺寸效应。
Fracture analysis of the interface of multi-material component joints under the action of thermal and mechanical loads is carried out by using improved virtual crack closure technique. First, the effect of rubber interlayer on the energy release rate and its various components under different temperature loads was studied by analyzing the fracture of one-legged curved (SLB) specimens with rubber-laminated composite laminates. Secondly, the thermo-mechanical coupling fracture analysis of the multi-material cylindrical shell connecting skirt structure with the typical composite material-rubber-metal under the heat flow boundary was carried out. The results show that the total energy release rate of the crack increases with the increase of temperature. Finally, the influence of crack location and rubber layer thickness on crack energy release rate is discussed based on the structure of the connecting skirt. It is pointed out that increasing the thickness of the rubber layer can reduce the energy release rate of the crack, but there is a size effect between the rubber thickness layer and the interface toughness.