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桥域方法是一种典型的跨尺度仿真研究方法.基于桥域理论,本文分析了原子和连续介质耦合区域的处理问题,即在耦合区采用不同的权重计算系统的能量,通过Lagrange乘子法对原子和连续介质位移进行约束.采用桥域方法,建立了单晶Cu米纳切削的跨尺度仿真模型,获得了单晶Cu纳米切削的材料变形机理.同时,研究了不同切削速度对纳米切削过程和原子受力分布的影响,仿真结果表明:随着切削速度的提高,切削区原子所受的力值增大,切屑变形系数减小,已加工表面变质层厚度增加.本文基于桥域理论,实现了Cu单晶纳米切削跨尺度的建模和仿真,为探索纳米切削的跨尺度仿真研究提供理论基础.
Bridge domain method is a typical cross-scale simulation research method.Based on the bridge domain theory, this paper analyzes the coupling problem between the atom and the continuum, which means that the energy of the system is calculated by using different weights in the coupling region, and the Lagrange multiplier method And constrained the displacement of atoms and continuums.A cross-scale simulation model of single-crystal Cu Miner cutting was established by bridge domain method, and the deformation mechanism of single-crystal Cu nano-cutting was obtained.At the same time, Process and the distribution of atomic stress.The simulation results show that as the cutting speed increases, the force of the atom in the cutting zone increases, the chip deformation coefficient decreases, and the thickness of the metamorphic layer on the machined surface increases.According to the theory of bridge domain , A multi-scale modeling and simulation of Cu single crystal nano-cutting was realized, providing a theoretical basis for exploring the multi-scale simulation of nano-cutting.