单晶材料纳米压痕压头尺寸效应的多尺度模拟
Multiscale simulation of indenter size effect of nanoindentation in single crystal materials
摘要
为了研究纳米压痕的压头尺寸效应，本文采用分离式拟质点多尺度方法对多种单晶材料（铜、铝和银）的纳米压痕问题进行了研究。研究表明，对于不同的压头宽度，三种材料的荷载-位移响应曲线都表现出明显的差异性。压头的宽度越大，弹性阶段的曲线斜率也越大，材料发生塑性变形的临界载荷也越大，其对应的临界压头位移也越大，发生位错形核的时间也越晚。材料出现塑性变形之后，其荷载值将开始下降，材料出现位错形核。金属铜薄膜和金属铝薄膜的载荷-位移曲线只经历了一次的降低过程，而金属银薄膜则呈现出多次起伏变化。
Abstract
In order to study the size effect in nano-indentation, this paper adopts separate quasi-particle multiscale method to study the nano-indentation problem of single crystal material, such as copper, aluminum and silver. The simulation results show that for the different widths, the displacement-response curve of three materials shows a distinct difference. For the greater width indenter, the load-displacement curve in elastic stage has a bigger curve slope, a larger load critical corresponding to plastic deformation, a larger critical displacement of indenter, and a later time appearing the dislocation nucleation. After the plastic deformation occurs, the load value will begin to decrease, and the dislocation nucleation appears in the material. The load-displacement curve for the single copper and aluminum only has a reduction process, while shows a multiple fluctuation for the single silver.关键词
固体力学/多尺度模拟/单晶材料/纳米压痕/尺寸效应Key words
solid mechanics/multiscale simulation/single-crystal copper/nanoindentation/surface defect引用本文复制引用
杨增杰,王振清.单晶材料纳米压痕压头尺寸效应的多尺度模拟[EB/OL].(2016-02-01)[2026-04-08].http://www.paper.edu.cn/releasepaper/content/201602-13.学科分类
材料科学/金属学、热处理
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