Abstract
Abstract To predict the residual life of structure under repeated impacts, the crack behavior of standard specimens with and without notch were studied experimentally and numerically. The history of crack propagation and energy absorption was recorded, and the fracture surface appearance was observed experimentally. A energy-based life prediction method for repeated impacts was proposed and validated by experiments, which includes the effects of strain rate and cumulative damage. It is found that structures under repeated impacts are extremely sensitive to notch or crack. With the increasing number of impacts, both the ratio of plastic energy to elastic energy raises and finally approaches to infinite at fracture.
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