基于QC多尺度模拟的单晶铜微构件压缩过程力学特性分析  

MULTISCALE SIMULATION OF THE COMPRESS BEHAVIOR ON SINGLE CRYSTAL COPPER MICROSTRUCTURE BASED ON QUASICONTINUUM METHOD

作　　者：白清顺[1] 张向前[1] 童振[1] 梁迎春[1] 盆洪民 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001 [2]天津航天机电设备研究所,天津300301

出　　处：《机械强度》2013年第6期810-815,共6页Journal of Mechanical Strength

基　　金：国家杰出青年科学基金(50925521);哈尔滨工业大学科研创新基金(HIT.NSRIF.2009012)资助~~

摘　　要：基于准连续介质多尺度模拟方法,建立单晶铜杆状微构件的压缩过程系列仿真模型,分析结构尺寸参数对微构件的弹性模量、弹性极限、屈服极限及泊松比等力学特性的影响。通过研究微构件在压缩变形时的形变、内部应力和应变能的演化规律,获得杆状微构件压缩变形及溃裂的产生机制。研究结果表明:与宏观值相比,压缩时的弹性模量、弹性极限和屈服极限的尺寸效应显著,而其泊松比变化不明显;杆状微构件在一维方向上的尺寸改变对其力学特性影响不明显;在压缩过程中孪生和位错滑移现象显著,微构件内部部分区域存在有应力集中,且大部分区域存在应变能突然减小的现象。Based on quasicontinuum （QC） multiscale simulation method, a series of simulation models were set up for compressing rod-shaped microstructure of single crystal Cu. The effects of structural parameters on typical mechanics parameters were analyzed, such as elastic modulus, ultimate elastic stress, yield strength and Poisson＇s ratio. The mechanisms of crush and compressed deformation were also revealed according to the analysis of displacement, inner stress and strain energy. It can be shown that the size effects of elastic modulus, uhimate elastic stress and yield strength in compression of microstructure are more obvious than that in macro scale. However, the size effect of Poisson＇s ratio is not remarkable in the simulation results. The dimension change in one direction cannot influence the mechanics parameters greatly. Mechanical twins and dislocation contribute mainly to the compression behavior. Meanwhile, stress concentration can also be found in the inner partial area and the stain energy decreases instantly after the crush of rod-shaped microstructure.

关 键 词：杆状微构件 多尺度仿真 压缩 力学特性 

分 类 号：TG113.25[金属学及工艺—物理冶金] TB303[金属学及工艺—金属学]