Examining the Effect of Pileup on the Accuracy of Sharp Indentation Testing

Examining the Effect of Pileup on the Accuracy of Sharp Indentation Testing
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检查堆积对锐利压痕测试精度的影响

DOI:
10.1155/2015/528729
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发表时间:
2015-09
影响因子:
--
通讯作者:
Wei Qiuming
Wei Qiuming
中科院分区:
材料科学4区
文献类型:
--
作者:
Tang Zhongbin;Guo Yazhou;Jia Zhaohu;Li Yulong;Wei Qiuming

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与仪器压痕相关的一个基本问题是堆积效应,这可能会对测量的硬度和弹性模量引入显著的误差。在这项工作中,我们已经评估了一些关键问题与仪表压痕通过数值模拟。采用量纲分析法获得了该过程的主要控制参数,如屈服强度与弹性模量的比值和压痕深度与最大穿透深度的比值。量纲分析提供了对这些无量纲变量之间的关系及其对测试结果的影响的一般理解。对锥形压头、布氏压头和维氏压头进行了对比研究。给出了堆积对无量纲参数的依赖关系及其对模拟结果的影响。这些研究结果对于采用仪器压痕法测量材料的力学性能,特别是考虑堆积效应时的力学性能具有指导意义。
One essential problem related to instrumented indentation is the effect of pileup, which could introduce significant errors on the measured hardness and elastic modulus. In this work, we have assessed some critical issues associated with instrumented indentation by means of numerical simulation. Dimensional analysis is adopted to acquire the principal governing parameters of the process, such as the ratio of yield strength to elastic modulus and the ratio of indentation depth to maximum penetration depth . The dimensional analysis provides a general understanding on the relationships among these dimensionless variables and their influence on the test results. Three kinds of indenters, that is, conical, Berkovich, and Vickers indenter, are comparatively studied. The dependence of pileup on the dimensionless parameters and its effect on the simulation results are also given. These findings are instructive for measuring the mechanical properties by instrumented indentation, especially when the effect of pileup is involved.
DOI: 10.1038/140260d0
发表时间: 1937-08
期刊: Nature
影响因子: 64.8
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