Abstract
The goal of this study is identification of metal material parameters by indentation test and FEM analysis. The Rockwell hardness testing machine is used for the indentation test to obtain the load P and the displacement h relationship (P-h curve) during the indentation process. A simple model with only indenter and test material is applied to the FEM model. The metal material parameters can be identified based on the curve fit using the quadratic polynomial function consisting of the coefficient β and variable x. The best solution is determined by using the response surface methodology (RSM). Variables x are Young's modulus, Poisson's ratio, strain hardening exponent and the coefficient of friction, and these combinations for the D-optimal design are generated by random numbers. For identification example using titanium alloy (TB340) assuming the n-power law, estimation was possible in the range ±5% errors. It has advantage to save the computational cost and applicability to other material laws by using the RSM.
