A NOVEL CHARCTERIZATION METHOD ON MECHANICAL BEHAVIOR OF UNLOADING CURVES BY USING BEERKOVICH TIP

JIANG Rui; GAO Jun; MA Jin; LU ZeYuan; ZHU DeQuan

doi:10.16579/j.issn.1001.9669.2015.03.002

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A NOVEL CHARCTERIZATION METHOD ON MECHANICAL BEHAVIOR OF UNLOADING CURVES BY USING BEERKOVICH TIP

更新时间：2022-09-22

- A NOVEL CHARCTERIZATION METHOD ON MECHANICAL BEHAVIOR OF UNLOADING CURVES BY USING BEERKOVICH TIP
- Journal of Mechanical Strength Vol. 37, Issue 3, Pages: 445-449(2015)
- 作者机构：
  
  1. 安徽农业大学工学院
  2. 中国科学院合肥物质科学研究院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2015.03.002
  CLC：
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JIANG Rui, GAO Jun, MA Jin, et al. A NOVEL CHARCTERIZATION METHOD ON MECHANICAL BEHAVIOR OF UNLOADING CURVES BY USING BEERKOVICH TIP. [J]. 37(3):445-449(2015)
DOI：

JIANG Rui, GAO Jun, MA Jin, et al. A NOVEL CHARCTERIZATION METHOD ON MECHANICAL BEHAVIOR OF UNLOADING CURVES BY USING BEERKOVICH TIP. [J]. 37(3):445-449(2015) DOI： 10.16579/j.issn.1001.9669.2015.03.002.

摘要

目前常用的压痕卸载曲线分析方法中,对于幂律指数的物理意义尚不清晰。基于平面半无限空间弹性压入问题的Sneedon解,考虑到塑性变形区和其周围的弹性基体之间的残余应力,提出了一种新的模型来表征Berkovich压针弹塑性卸载过程。分别采用抛物体形压针和圆锥形压针来近似Berkovich压针弹塑性卸载曲线,实验研究表明:采用抛物体形压针能够较好地表征压痕的载过程,同时验证了新模型的合理性。

Abstract

Unloading curve analysis is a popular method in nan-indentation testing process,while the physical signification of the power-law exponent is obscure. Based on the Sneedon’s solution to elastic indentation of plane half infinite space,a new model was presented to characterize the plastic unloading behavior of Berkovich tip. The residual stress among elastic-plastic stain regions was taken into accounted. The plastic unloading behavior of Berkovich tip was characterized approximately using parabolic tip and conical tip. Experimental results indicated that parabolic tip can characterize the plastic unloading behavior more accurate and the rationality of the new model was validated.

关键词

纳米压痕弹性压入问题残余应力抛物体形压针圆锥形压针

Keywords

NanoindentationElastic indentationResidual stressParabolic tipConical tip

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