受内压和激光辐照联合作用下圆柱壳动态断裂力学分析

Analysis of dynamic fracture with hollow cylinder by internal pressure and laser irradiation

针对激光辐照充压圆柱壳的应力分析和结构失效问题,研究了含轴向半椭圆表面裂纹的圆柱壳体在激光辐射及不同内压和不同裂纹尺寸的情况下,考虑了内压为静态和动态两种情形以及热-力耦合情形的应力分析,材料为30CrMnSiA钢。根据它的静态断裂韧性KIC以及根据估算的冲击动态断裂韧性KId,应用有限元方法研究了动态载荷下其断裂问题。分别使用断裂判据KI=KIC和动态断裂判据KI(t)=KId,对裂纹的静态起始扩展和动态起始扩展作了相应的分析,这些分析在一定程度上对此种结构在热-力耦合下失效机理提供了有益的研究。

In view of the problem that stress analysis and structural failure of the filling pressure cylindrical shell by laser irradiation,the dynamic fracture of a hollow cylinder with a semi-elliptic surface crack under different internal pressures and crack size loading is investigated,the analysis of stress is considering the loading of static and dynamic pressure and the materials is 30CrMnSiA steel.According to the static fracture toughness KIC and the impact of dynamic fracture toughness KId,the finite element method is applied to study the dynamic fracture of the cylinder shell.The fracture criterion KI =KIC and dynamic fracture criterion KI（t） =KId are used respectively.The analysis of static and dynamic initial expansion is made and its analysis play a significant role in studying these structures failures in thermal-mechanical couple.