Molecular dynamics simulation of micro particle ejection from a shock-impacted metal surface
冲击作用下金属表面微喷射的分子动力学模拟

The dynamic process of micro particle ejection from shock impacted metal with grooved surface is investigated by molecular dynamics simulation using a hybrid tight binding like potential. The calculated results show that, after ejection, there propagate in sequence a reflection rarefaction wave and a second uploading compression wave in the material, and correspondingly a negative pressure region and a high pressure region are induced. The front shape of the reflection rarefaction wave is similar to the groove shape, but the front shape of the second uploading compression wave varies with the groove angle. The average velocity of the ejected particles increases with the groove angle. On the contrary, the amount of ejected particles decreases as groove angle increases. When the groove semi angle is larger than 60 degrees, ejection disappears.