Triangular pyramidal indenter, Exponential index of unloading curve, Young's modulus
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Study on Evaluational Method of Determining Material Characteristics using Ultramicro Hardness Tester(Estimation about Exponential Index of Unloading Curve and Finish Point of Unloading using Triangular Pyramidal Indenter)
In this paper, it is described about the method for an evaluation of material characteristics in submicron scale, by using ultramicro hardness tester with triangular pyramidal indenter, which can investigate for extremely small and shallow area of material properties. The indentation tests for three materials (aluminum alloy, phosphor bronze, stainless steel) are carried out,obtained loading and unloading curve, respectively. From unloading curve, exponential index and finish point of each curve are derived. As a result, it turns out that the exponential index of unloading curve was 1.5, although with different materials. Consequently, calculated Young's moduli using exponential index are approximately consistent with measured Young's modulus.
超微小硬さ試験を利用した材料特性評価法(三角錐圧子による除荷曲線部の形状指数と除荷終了点)
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