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首页> 外文期刊>Journal of Micromechanics and Microengineering >Finite element analysis of the penetration depth/tip radius ratio dependence on the correction factor β in instrumented indentation of elastic-plastic materials
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Finite element analysis of the penetration depth/tip radius ratio dependence on the correction factor β in instrumented indentation of elastic-plastic materials

机译：弹塑性材料工具压痕中穿透深度/尖端半径比与校正因子β的关系的有限元分析

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摘要

Measurements of mechanical properties by instrumented indentation rely heavily upon the relationship between the unloading contact stiffness, S_u, the projected contact area, A_c, and the reduced modulus, E_r. This relationship is written in the form S_u = 2βE_r (A_c/π)~(1/2), where β is a correction factor that depends on the material properties, the geometry of the indenter and also the penetration depth. Most of the time a constant value of β is used in experimental measurements, either 1.0 or a value around 1.05, which is not correct since β strongly depends on the penetration depth as demonstrated by finite element calculations (FEC) on purely elastic materials and also experimentally on the fused quartz, which is the usual sample used for calibration of the contact area function. Here, the dependence of β on the penetration depth and tip blunting is studied by FEC in the case of elastic-plastic materials generally encountered in engineering. The consequence of not taking into account the influence of β on hardness and elastic modulus measurements is also investigated.
机译：通过仪器压痕测量机械性能在很大程度上取决于卸载接触刚度S_u，投影接触面积A_c和减小模量E_r之间的关系。该关系以S_u =2βE_r（A_c /π）〜（1/2）的形式表示，其中β是取决于材料属性，压头的几何形状以及穿透深度的校正因子。大多数时候，在实验测量中使用恒定的β值（1.0或1.05左右）是不正确的，因为β强烈取决于穿透深度，如对纯弹性材料的有限元计算（FEC）所示，在熔融石英上进行实验，这是用于校准接触面积功能的常用样品。在这里，在工程中通常遇到的弹塑性材料的情况下，通过FEC研究了β对渗透深度和尖端钝化的依赖性。还研究了未考虑β对硬度和弹性模量测量结果的影响。

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