基于分子动力学的金属钛纳米切削过程研究

The Research of Titanium Nanometric Cutting Process Based on Molecular Dynamics

摘要:

本文采用基于分子动力学的仿真方法建立了金属钛纳米切削分子动力学模型，选择了有代表性的切削条件，通过仿真得到瞬间原子位置图像并对切削过程中材料去除现象、加工表面形成过程、系统势能和工件温度等的变化进行了分析。发现在金属钛的纳米切削过程中切屑和加工表面是由于晶格能的释放和位错的不断延伸扩展形成的。已加工表面原子的弹性恢复和晶格重构能够减缓总势能和温度不断增加的趋势，并使其伴随有微小波动。

Abstract:

Based on the molecular dynamics simulation (MDS) method, this article built up a molecular dynamics (MD) model of titanium nanometric cutting, chose representative cutting conditions, obtained the instantaneous image of atomic position through simulation and analyzed the material removal phenomenon, surface formation process, change rules of system potential energy and workpiece temperature in cutting process. It is found that the formation of the chips and the machined surface in cutting process are caused by the release of lattice energy and the lasting expansion of dislocation. The elastic recovery and lattice reconstruction of the machined surface and can slow down the increasing trend of total potential energy and temperature, and make them accompanied by slight fluctuations.