刀尖圆弧半径对单晶铜纳米切削过程影响的分子动力学分析

发布时间：2018-04-28 19:25

本文选题：纳米切削 + 刀尖圆弧半径　；参考：《材料导报》2015年02期

【摘要】：采用分子动力学方法对不同刀尖圆弧半径时在纳米级尺度下切削加工单晶铜表面的过程进行分子动力学建模、计算与分析,研究不同刀尖圆弧半径对单晶铜纳米切削过程中微观接触区域原子状态和作用力变化的影响规律。研究结果发现:在单晶铜纳米切削过程中,切削作用力、位错及位错发射等缺陷随着切削厚度或刀尖圆弧半径的增大而增加;在相同切削厚度,相同切削距离下,刀尖圆弧半径越大,在刀具前方堆积的切屑体积越小。此外,在切削距离为1nm时,切削作用力发生突变;在切削距离1nm到2nm时,可以明显看到随切削距离的增加,刀尖圆弧半径越小,切削作用力上升幅度越大。在切削距离为3.5nm时,切削作用力基本保持稳定波动,其主要原因是位错等缺陷的产生引发作用力的波动。
[Abstract]:Molecular dynamics method was used to model, calculate and analyze the process of machining the surface of single crystal copper at nanometer scale with different radius of circular arc of knife tip. The influence of different radius of arc on the change of atomic state and force in microcosmic contact region in nanocrystalline copper cutting was studied. The results show that the defects such as cutting force, dislocation and dislocation emission increase with the increase of the cutting thickness or the radius of the arc of the cutter tip in the process of nanocrystalline copper cutting, and at the same cutting thickness and the same cutting distance, The larger the radius of the tip arc, the smaller the size of chip accumulated in front of the tool. In addition, when the cutting distance is 1nm, the cutting force changes, and when the cutting distance from 1nm to 2nm, it can be seen that with the increase of cutting distance, the smaller the arc radius of the cutter tip, the greater the increasing amplitude of cutting force. When the cutting distance is 3.5nm, the cutting force basically keeps stable fluctuation, the main reason is the fluctuation of the force caused by the dislocations and other defects.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家自然科学基金(51365021)
【分类号】：TG501

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