Influences of pileup on the measurement of mechanical properties by load and depth sensing indentation techniques
Influences of pileup on the measurement of mechanical properties by load and depth sensing indentation techniques
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DOI：
10.1557/jmr.1998.0146
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发表时间：
1998-04-01
影响因子：
2.7
通讯作者：
Pharr, GM
中科院分区：
文献类型：
--
作者：
Bolshakov, A;Pharr, GM
对多种弹塑性材料的锥形压痕进行了有限元模拟，研究了堆积对载荷和深度传感压痕技术测量硬度和弹性模量的精度的影响。在调查中的关键参数是接触面积，这可以确定从有限元结果，通过应用标准分析程序的模拟压痕载荷-位移数据，如将在实验中，或更直接地，通过检查的接触轮廓在有限元网格。根据材料的堆积行为，这两个区域可能非常不同。当桩高较大时，从荷载-位移曲线分析中推导出的面积低估了真实接触面积达60%。这反过来又导致硬度和弹性模量的高估。确定了误差显着的条件，并展示了如何使用从压痕载荷-位移数据测量的参数来确定堆积何时是一个重要因素。
Finite element simulation of conical indentation of a wide variety of elastic-plastic materials has been used to investigate the influences of pileup on the accuracy with which hardness and elastic modulus can be measured by load and depth-sensing indentation techniques. The key parameter in the investigation is the contact area, which can be determined from the finite element results either by applying standard analysis procedures to the simulated indentation load-displacement data, as would be done in an experiment, or more directly, by examination of the contact profiles in the finite element mesh. Depending on the pileup behavior of the material, these two areas may be very different. When pileup is large, the areas deduced from analyses of the load-displacement curves underestimate the true contact areas by as much as 60%. This, in turn, leads to overestimations of the hardness and elastic modulus. The conditions under which the errors are significant are identified, and it is shown how parameters measured from the indentation load-displacement data can be used to identify when pileup is an important factor.