Dynamic Fracture of Impacted Hollow Cylinder with Semi-Elliptic Surface Crack
Guo Ruiping(1,2),Liu Guanting(2),Fan Tianyou(3),Zhao Jianheng(4),Tan Fuli(4)
(1 Academy of Equipment Command and Technology, Beijing 101416,China)
(2 Inner Mongolia Normal Universtiy, Huhehaote 010022, China)
(3 Beijing Institute of Technology, Beijing 100081,China)
(4 Southwest Institute of Fluid Physics, Chengdu, Sichuan 610003,China)

Abstract: It is difficult of obtain the analytic solutions for dynamic fracture of finite-sized components with crack under impact loading due to itself inhere rent complexity. Aiming at a impacted hollow cylinder with a semi-elliptic surf ace crack, three-dimensional finite element program is developed to determine the crack tip displacement and dynamic stress intensity factor. The results show that the ratio of K^dyn_I(t)/K^sta_I  is related to the sizes of the structure and crack, but independent on the loaded impact amplitude. The interactions of hollow cylinder boundary surface, crack surface, material inertia with elastic wave propogation are revealed simultameously.
Keywords: hollow cylinder, surface crack, dynamic loading, dynamic stress inten sity factor, finite element method.