基于桥域理论的Cu单晶纳米切削跨尺度仿真研究  

Multiscale simulation of nanometric cutting of single crystal Cu based on bridging domain method

作　　者：梁迎春[1] 盆洪民[1] 白清顺[1] 卢礼华[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《物理学报》2011年第10期30-35,共6页Acta Physica Sinica

基　　金：国家杰出青年基金(批准号:50925521);国家自然科学基金(批准号:50705023);哈尔滨工业大学科研创新基金(批准号:HIT.NSRIF.2009012)资助的课题~~

摘　　要：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.One of the significant methods of multiscale simulation named bridging domain method which is a mixed atomistic-continuum formulation is reviewed.The mode related to atomistic/continuum coupling is introduced.The coupled method with the treatment of the overlapping subdomain is discussed,in which different scaling parameters（weigh factors） are adopted to calculate the energy of the system in the overlapping subdomain and to constrain the atomic and the continuum displacements by the Lagrange multiplier method.A bridging domain model is set up to investigate the effect of cutting speed on chip and workpiece atom force distribution in the nanometric cutting of single crystal copper.Simulation results show the cutting deformation coefficient decreases and the workpiece atom force increases with the increase of cutting speed.In addition,the machined surface qualities at different cutting speeds are investigated.The multiscale model and simulation of nanometric cutting are accomplished based on the bridging domain method,which lays a theoretical foundation for exploring the trans-scale simulation of nanometric cutting.

关 键 词：桥域法 纳米切削 单晶Cu 切削速度 

分 类 号：TG501[金属学及工艺—金属切削加工及机床]