Abstract
An elastic-plastic dynamic line-spring model is proposed for the simplified analysis of impact response of a part-through surface crack in an elastic-perfectly plastic plate. Bending of the plate is treated based on Mindlin's theory. Stiffness of the dynamic line-spring is evaluated by considering the growth of the plastic zone in the remaining regament and the unloading. The crack tip opening displacement, CTOD, for a semielliptical surface crack in a plate subjected to impact loading at its ends is calculated by using the present model. It is found that CTOD takes its maximum value at the deepest penetration point of the surface crack and the maximum value is larger than that in the static case.
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