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Large-scale molecular dynamics simulations are carried out to investigate the ejecta production from nanocrystalline Cu with a grooved surface under various shock intensities. The microjetting processes from the sample before and after shock-reduced melting are obtained, and the effects of polycrystalline as well as solid–liquid transition on ejecta properties are analyzed. It is found that polycrystalline structure has a significant influence on microjetting properties, including the critical condition of microjet formation and the total mass of ejecta, before shock-induced melting. After shock-induced melting, the microjetting from the nanocrystalline system tends to be consistent with the monocrystalline system.

ATOMISTIC SIMULATION OF EJECTA PRODUCTION FROM NANOCRYSTALLINE CU WITH A GROOVED SURFACE UNDER SHOCKWAVE LOADING