吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (5): 1366-1370.doi: 10.7964/jdxbgxb201405023

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不同接触零点对纳米压痕测试影响的有限元解析

马尧, 董晓龙, 李泽君, 沈林, 赵宏伟   

  1. 吉林大学 机械科学与工程学院,长春 130022
  • 收稿日期:2013-06-02 出版日期:2014-09-01 发布日期:2014-09-01
  • 作者简介:马尧(1992), 男.研究方向:材料微观性能与3D打印制造.E-mail:myao1992@sina.com
  • 基金资助:
    “863”国家高技术研究发展计划项目(2012AA041206); 国家自然科学基金项目(51275198).

Finite element simulation of the effect of different initial contact on nano-indentation

MA Yao, DONG Xiao-long, LI Ze-jun, SHEN Lin, ZHAO Hong-wei   

  1. College of Materials Science and Engineering, Jilin University, Changchun 130022,China
  • Received:2013-06-02 Online:2014-09-01 Published:2014-09-01

摘要: 为了有效估计由于粗糙度因素造成纳米压痕测试结果的偏差,对纯铝的纳米压痕进行了有限元仿真研究。利用二维轮廓模型,采用模型轮廓最大高度Ry作为评定样品表面粗糙度的参数,并引入轮廓的波峰与波谷之间的水平距离D和波谷的中垂线与相邻凸面切线之间的夹角θ。仿真发现:相比光滑表面,在不同的接触零点,测试结果存在差异:接触零点为粗糙表面波峰时,最大载荷测试结果偏小;接触零点为粗糙表面波谷时,最大载荷测试结果偏大;压头压向波谷,压头棱边与凸起接触为接触零点时,测试结果引起的偏差相对较小。

关键词: 纳米压痕, 表面粗糙度, 接触零点, 有限元仿真

Abstract: To effectively estimate the test deviation of nano-indentation due to surface roughness, a finite element simulation of nano-indentation is carried on pure aluminium. A two dimension model is adopted and the maximum height Ry of the model contour is regarded as the assessment of the sample surface roughness parameters. Parameter D represents the horizontal distance between the peaks and valleys of the contour. The angle θ between the valley's midperpendicular and the tangent of adjacent convex is introduced. Compared with the smooth surface, for different initial contact, simulation results show obvious diversity: for initial contact at the peak of the rough surface, the maximum load is smaller; for initial contact at the valley of the rough surface, the maximum load is bigger; for initial contact at the edge of indenter and the bulge of the contour, the result is relatively close to the smooth one.

Key words: nano-indentation, surface roughness, initial contact, finite element method(FEM)

中图分类号: 

  • TG156
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