This work introduces an inverse analysis procedure for identifying the elastoplastic material parameters from indentation tests. The parameter optimisation Levenberg-Marquardt method is used to extract the elastic modulus, yield strength and strain hardening exponent from the indentation load-depth curve. The effectiveness of the proposed procedure is verified using pseudo-experimental (computer generated) data obtained from 2D finite element analyses of the indentation problem. It is shown that a single set of indentation load-depth data may not be sufficient to predict effectively the mechanical properties due to ill-conditioned and non-uniqueness problems. However, these problems are overcome when two different sets of indentation data obtaining from two different indenters e.g. conical and spherical indenters, are used. The results of this work confirm the usefulness and feasibility of the proposed procedure. Although the procedure proposed here is used to predict two unknown parameters, it is also applicable to estimate other physical or mechanical properties where there are e more than two unknown parameters.
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