DYNAMIC STRESS INTENSITY FACTORS ANALYSIS OF INTERFACE CRACK USING LINE-SPRING MODEL

In this study, a new method for calculating the dynamic stress intensi ty factors of a bimaterial bending specimen with an interface crack is proposed by making use of a line-spring model. A pre-cracked bending specimen is modeled by one-dimensional beam finite elements and a line -spring representing the stiffness or compliance of a cracked part. Th e proposed method enables the one-dimensional analysis of a two-dimens ional crack problem; thus the time variations of the dynamic stress in tensity factors of a bimaterial bending specimen with an interface cra ck can be obtained by making use of a personal computer within a few m inutes. The results obtained by the proposed method agree reasonably w ell with those obtained by the two-dimensional finite element method, although a slight difference in period can be found. The proposed meth od enables rapid evaluation of dynamic stress intensity factors. So a rapid evaluation system of the dynamic fracture toughness of a bimater ial with an interface crack can be achieved by combining an instrument ed impact test apparatus with a computer program based on the proposed method which runs on a personal computer.