Numerical Simulation of Target Damage Zone under Hypervelocity Impact
In hypervelocity impact problems,it is difficult to accurately obtain the crater morphology under certain conditions.Studying the damage zone can compensate for this limitation and serve as an im-portant basis for understanding the impact mechanism and validating numerical simulations.However,there has been limited research on numerical simulation of the damage zone due to the lack of experimental-ly validated criteria.This paper presents a summary of the existing quantitative measurement results for the damage zone.The findings reveal that,for the same target,the depths of the damage zone obtained through multiple microscopic testing methods are relatively consistent,which facilitates the analysis of the damage zone.Based on the iSALE code,the applicability of total plastic strain(TPS),damage factor(D),and peak pressure as criteria for assessing the damage zone is analyzed.The results indicate that,TPS=0.1 is appropriate as a damage criterion,D=1 could be used as a damage criterion with caution,while peak pressure is not a suitable damage criterion.Through parametric analysis,it is found that the damage zone gradually decreases with increasing porosity and target strength.
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