Cluster-induced crater formation

[摘要] Using molecular-dynamics simulation, we study the crater volumes induced by energetic impacts (v = 1-250 km/s) of projectiles containing up to N = 1000 atoms. We find that for Lennard-Jones bonded material the crater volume depends solely on the total impact energy E. Above a threshold E-th, the volume rises linearly with E. Similar results are obtained for metallic materials. By scaling the impact energy E to the target cohesive energy U, the crater volumes become independent of the target material. To a first approximation, the crater volume increases in proportion with the available scaled energy. V = aE/U. The proportionality factor a is termed the cratering efficiency and assumes values of around 0.5. (C) 2009 Elsevier B,V. All rights reserved.

[发布日期] 2009-09-15

[效力级别]  Proceedings Paper

[关键词] Cluster impact;Molecular-dynamics simulation;Sputtering;Crater formation