采用准连续介质方法模拟了纳米压痕实验中单晶Cu初始塑性变形过程. 采用3种不同宽度的纳米尺度压头, 得到了载荷-压痕位移关系曲线, 确定了 3种不同宽度压痕下位错发射的临界载荷. 临界载荷的大小与能量理论的预测结果基本一致. 通过对压头下方位移场的分析, 揭示了加载过程中位错形核的力学特征和微观结构特征; 得到了压头下方几何必需位错密度增加的一般规律. 定性地分析了卸载过程中位错的运动与湮灭.
The processes of initial plastic deformation of single crystal Cu in nanoindentation are simulated by using quasicontinuum method. The indenters with three different widths are used and the corresponding curves of load-displacement are analyzed to determine the critical loads of dislocation emission, which are basically in agreement with the loads predicted from energy point of view. The mechanical and microstructural characteristics of dislocation nucleation are revealed by analyzing the displacement field beneath the indenters. The general regularity of the increase of geometrically necessary dislocations beneath the indenter is presented. The motions and annihilations of dislocations in the unloading are discussed qualitatively.
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