Abstract
In this study, a method for calculating the dynamic stress intensity factor of a bimaterial bending specimen with an interface crack is proposed for the first time by making use of a line-spring model. A precracked bending specimen is modeled by one-dimensional beam finite elements and a line-spring representing the stiffness or compliance of a cracked part. The present method enables the one-dimensional analysis of a two -dimensional crack problem ; thus the time variation of dynamic stress intensity factors of a bimaterial bending specimen with an interface crack can be obtained by making use of a personal computer within a few minutes. The results obtained from the present method agree reasonably well with those obtained from the two-dimensional finite element method, although a slight difference in period can be found. The present method enables rapid evaluation of dynamic stress intensity factors. Thus a rapid evaluation system of dynamic fracture toughness of a bimaterial with an interface crack can be achieved by combining an impact test apparatus with a computer program based on the present method which runs on a personal computer.
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