Interrelation between static and dynamic stress intensity factors and their evaluation by caustics

Abstract

Abstract

The stress field around the tip of a crack propagating with constant velocity depends on the dynamic stress intensity factors K_I^d and K_II^d if both of them are operative. These factors may be defined by their corresponding static values K_I^S and K_II^S multiplied by convenient correction factors depending mainly on the crack propagation velocity c and on the longitudinal (c₁) and shear (c₂) was velocities of the material of the specimen. In this way a quantitative relation between dynamic and static components of the stress intensity factors is established. The dependence of this relation on the various components of velocities is investigated in this paper. It is also shown that the experimental method of reflected caustics gives an evaluation of this relation for various crack velocities and angles of inclination of the propagating crack.