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A finite element study of the effects of residual stress on conical indentation.

机译：残余应力对锥形压痕影响的有限元研究。

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The finite element method has been used to study the behavior of an aluminum alloy during elastic-plastic indentation by a rigid conical indenter to determine how the indentation process is affected by residual stress. The study was motivated by recent experimental results which showed that the hardness and elastic modulus of the alloy measured using nanoindentation methods appeared to decrease as the residual stress was increased. Biaxial radial stress was applied as a boundary condition, and indentation load-displacement curves were generated and analyzed according to various accepted methods for measuring hardness and modulus. The results of the study show that the standard methods by which hardness and elastic modulus are measured can lead to inaccuracies because they do not account for pile-up in the contact area calculations. Furthermore, if the contact area is measured properly, then hardness and elastic modulus are not significantly affected by residual stress.
机译：有限元方法已被用于通过刚性圆锥形压头研究铝合金在弹塑性压痕过程中的行为，以确定压痕过程如何受到残余应力的影响。这项研究是受最近的实验结果推动的，该结果表明，使用纳米压痕法测量的合金硬度和弹性模量随着残余应力的增加而降低。将双轴径向应力作为边界条件，并根据各种公认的测量硬度和模量的方法生成压痕载荷-位移曲线并进行分析。研究结果表明，测量硬度和弹性模量的标准方法可能会导致不准确，因为它们没有考虑接触面积计算中的堆积。此外，如果正确测量接触面积，则残余应力不会显着影响硬度和弹性模量。

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