中文摘要：

流体计算采用基于非结构动网格的有限体积方法，结构计算采用分段精细时程积分方法，求解结构动力学有限元方程，流体计算和固体计算之间采用松耦合在不断运动的交界面上进行作用力和运动特性的传递，对固体火箭发动机点火形成的冲击波与药柱缺陷形成的弹性裂纹之间相互耦合作用过程进行了模拟。研究表明，作用在弹性裂纹上的冲击波载荷引起的壁面变形随时间变化明显，开始表现为撑开裂纹出口，随后出现了收缩出口撑开底部的瓶状；固体变形对冲击波在弹性狭缝内的压力波振荡影响较小，以前采用刚体模型得到的研究结论仍有指导意义。

英文摘要：

The fluid-structure interaction between ignition shock wave and elastic cracks of grain in SRM was investigated nu- merically by using loose coupling method. Finite volume method was adopted in fluid calculation on dynamic unstructured grid within an Arbitrary Lagrangian-Eulerian （ALE） framework, while the subsection precise time-integration method was used to solve the structure dynamic equations. In each time step, the data of pressure in fluids and displacement in structures were exchanged at the interface. The results show that deformation on the surface of the grain is visible because of the pressure load on the crack. The exit of the crack expands firstly, and then shrinks, and the bottom of crack expands, while the shape of the crack is just like a bottle. Pressure oscillation in the crack is influenced by the structure deformation slightly, so that the research conclusion on rigid-body as- sumption is still significative.