Abstract
Based on the open source molecular dynamics program LAMMPS, hypervelocity impact of a spherical aluminum projectile with a diameter of 4.86 nm on the semi-infinite thick aluminum target at the speed of 10 km/s was simulated. The physical process of crater formation was similar to that from a macroscopic impact. The crater depth was consistent with the data from the macro empirical formula and its variation with time was obtained. The propagation characteristics of the shock wave in the target were analyzed. The propagation speed of the shock wave front reached up to 12 km/s during the initial impact, and then the speed gradually decreased and was close to the elastic wave velocity. The observation region around the crater experienced melting state which lasted about 0.07 ps and had a layer thickness of 29 nm. The cooling rate of the observation region around the crater reached the order of 1015 K/s which prevented atom recrystallization. The observation region finally turned into a solid phase amorphous structure.
| Translated title of the contribution | Molecular Dynamics Simulation on Characteristics of Crater Formation Induced by Hypervelocity Impact |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 1217-1221 |
| Number of pages | 5 |
| Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
| Volume | 38 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1 Dec 2018 |