This study proposes a method for evaluating elastic limit and strain hardening exponent by a single spherical indentation test. The method extracts the plastic properties from radial displacement fields and vertical profile of a residual imprint. Based on finite element (FE) and regression analyses, an evaluation algorithm is developed by relating the imprint data with plastic properties. Digital image correlation (DIC) method is used for measurements of the radial displacement fields. The errors of the properties determined with our method were less than 12 % for elastic limit stress, 0.6 for strain hardening exponent compared with those from tensile tests. The sensitivity of the inverse analysis algorithm is also shown to be acceptable.

本研究提出了一种通过单次球形压痕试验评估弹性极限和应变硬化指数的方法。该方法从径向位移场和残余压痕的垂直轮廓提取塑性属性。基于有限元（FE）和回归分析，通过将压印数据与塑性属性相关联，开发了一种评估算法。数字图像相关（DIC）方法用于测量径向位移场。与拉伸试验相比，用我们的方法测定的性能误差对于弹性极限应力小于12％，对于应变硬化指数小于0.6。反演算法的灵敏度也被证明是可以接受的。