Simulation of cohesive head-on collisions of thermally activated nanoclusters
Simulation of cohesive head-on collisions of thermally activated nanoclusters
复制标题
DOI：
10.1103/physreve.79.031309
复制
发表时间：
2009-03-01
影响因子：
2.4
通讯作者：
Hayakawa, Hisao
中科院分区：
文献类型：
--
作者：
Kuninaka, Hiroto;Hayakawa, Hisao
对纳米团簇在热波动作用下的冲击现象进行了数值研究。通过对两个相同团簇碰撞的分子动力学模拟，发现由于团簇之间的内聚相互作用和排斥相互作用的竞争，迎头碰撞的恢复系数在碰撞速度处有一个峰值。碰撞的某些方面可以用物理学的理论来理解。Rev. E 76, 051302(2007)]，但从仿真中发现了许多方面。特别地，我们发现有一些恢复系数大于1的异常回弹。回弹过程随冲击速度和内聚参数的相图可以用简单的现象学来理解。
Impact phenomena of nanoclusters subject to thermal fluctuations are numerically investigated. From the molecular dynamics simulation for colliding two identical clusters, it is found that the restitution coefficient for head-on collisions has a peak at a colliding speed due to the competition between the cohesive interaction and the repulsive interaction of colliding clusters. Some aspects of the collisions can be understood by the theory of Brilliantov [Phys. Rev. E 76, 051302 (2007)], but many aspects are found from the simulation. In particular, we find that there are some anomalous rebounds in which the restitution coefficient is larger than unity. The phase diagrams of rebound processes against impact speed and the cohesive parameter can be understood by a simple phenomenology.