【摘要】 材料破坏准则的采用是制约动态层裂机制研究的主要因素之一。采用一维弹脆性平面波理论,运用累积损伤破坏准则对因爆炸或冲击引起的层裂问题进行分析。解析了三角形脉冲荷载在考虑升压时间时第1次层裂厚度的变化规律。研究表明:考虑升压时间时得出的层裂片厚度比不考虑升压时间时要小,运用累积损伤破坏准则计算出的层裂片厚度比最大拉应力瞬时断裂准则的计算值大。分析结果对研究地冲击荷载作用下地下洞室的震塌破坏有一定的参考价值。更多还原

【Abstract】 Adopting of failure criteria is one of major factors that restrict the mechanism research of dynamic spalling.According to one-dimensional elastic-brittle plane wave theory and the cumulating damage failure criteria,spalling process under explosion or impact loading is investigated.The variation of the first spalling thickness is studied for analyzing triangular impulse loading considering rise time.The analysis result indicates that the spalling layer thickness considering rise time is less than that of without considering rise time;the spalling thickness calculated with cumulating damage failure criteria is larger than that with maximum tensile stress instant fracture criteria.The research findings are valuable in the study of the ground-shock-induced collapse of tunnel.更多还原