含半椭圆表面裂纹圆柱壳体的三维热弹性动态断裂  

THREE-DIMENSIONAL THERMAL-ELASTIC DYNAMIC FRACTURE OF HOLLOW CYLINDER WITH A SEMI-ELLIPTIC SURFACE CRACK

作　　者：郭瑞平[1] 范天佑[2] 

机构地区：[1]装备指挥技术学院,北京101416 [2]北京理工大学,北京100081

出　　处：《工程力学》2006年第5期29-33,39,共6页Engineering Mechanics

基　　金：国家自然科学基金资助项目(10176003)

摘　　要：研究了含轴向半椭圆表面裂纹的圆柱壳体在热应力与冲击载荷作用下的动态断裂情况,并应用所研制的三维动态断裂有限元程序进行了大规模的数值计算,确定了圆柱壳体的三维温度分布及热-力耦合下的动态应力强度因子,所得结果在一定程度上揭示了热-力作用下圆柱壳体的边界表面、裂纹面、物质惯性和弹性波的相互作用在结构动态断裂中的重要性。Thermal-elastic dynamic fracture of a hollow cylinder with a semi-elliptic surface crack under thermal stress and impact loading is investigated, The analysis is performed by means of fracture dynamics and finite element method, and a three-dimensional finite element program is developed to determine the temperature field and dynamic stress intensity factor. The results show that the effects of hollow cylinder＇s boundary surface, crack surface, material inertia and elastic waves play significant roles under impact loading coupled with thermal stress.

关 键 词：动态断裂 表面裂纹 圆柱壳体 热应力 冲击载荷 动态应力强度因子 有限元法 

分 类 号：O346[理学—固体力学] TB12[理学—力学]