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球形压痕技术在材料力学属性,诸如硬度,弹性模量等的测量中得到了广泛的应用。应用Twyman-Green及云纹干涉法并配合相移技术,本文对IN783合金进行了一系列的球形压痕实验研究,并对残余压痕的面内(u, v)及离面( w)变形场进行了定量测量和分析。应用面内变形测量结果,进一步对试件表面的应力-应变分布进行了分析和计算,并在离面变形场的基础上,确立了压痕周围的弹塑性边界,从而进一步应用面内的分析结果,得到材料的屈服强度。应用压痕实验的接触半径和压力并配合Tabor经验公式,本文进一步得到了材料的应力应变曲线。实验结果与已知的IN783合金相吻合。对所涉及的一系列压痕实验,本文也进行了二维有限元分析并得到了比较一致的结果。
Spherical indentation techniques are widely used in the measurement of mechanical properties of materials such as hardness and elastic modulus. In this paper, a series of spherical indentation experiments were carried out on IN783 alloy by using Twyman-Green, moire patterning and phase-shift techniques. In-plane (u, v) and out-of-plane Field conducted a quantitative measurement and analysis. Based on the in-plane deformation measurement results, the stress-strain distribution on the specimen surface is further analyzed and calculated. Based on the out-of-plane deformation field, the elastic-plastic boundary around the indentation is established, and the in-plane analysis As a result, the yield strength of the material is obtained. Applying the contact radius and pressure of indentation experiment and Tabor empirical formula, the stress-strain curve of the material is further obtained. The experimental results agree well with the known IN783 alloy. For a series of indentation experiments, this paper also conducted two-dimensional finite element analysis and obtained more consistent results.