单晶材料纳米压痕压头尺寸效应的多尺度模拟

全部作者: 杨增杰,王振清
作者单位: 哈尔滨工程大学航天与建筑工程学院
摘 要: 为研究纳米压痕的压头尺寸效应,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-位移响应曲线均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就越大,材料发生塑性变形的临界载荷及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降低过程,而金属银薄膜则呈现出多次起伏变化。
关 键 词: 固体力学;多尺度模拟;单晶材料;纳米压痕;尺寸效应
Title: Multiscale simulation of indenter size effect of nanoindentation in single crystal materials
Author: YANG Zengjie, WANG Zhenqing
Organization: College of Aerospace and Civil Engineering, Harbin Engineering University
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 curves of three materials show 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.
Key words: solid mechanics; multiscale simulation; single-crystal copper; nanoindentation; size defect
发表期数: 2016年4月第7期
引用格式: 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[J]. 中国科技论文在线精品论文,2016,9(7):711-717.
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