Abstract

A dynamic line-spring model is proposed for the simplified analysis of impact response o a part-through surface crack in an elastic plate. Bending of the plate is considered based on Mindlin's theory. Stiffness of the dynamic line-spring is simply evaluated following the static model of Rice and Levy. The procedure for evaluating the dynamic stress-intensity factor KId is developed. The response of a semielliptical surface crack in a plate subjected to impact loading at its ends is analysed by using the present model. It is found that KId takes its maximum value at the deepest penetration point of the surface crack and the maximum value is much larger than that in the static case.

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