Validation of material constitutive parameters for the AISI 1010 steel from Taylor impact tests

Abstract

Numerical simulations of high strain-rate events require robust characterization of constitutive material parameters in order to predict accurately the deformation process. Historically, this characterization has been performed using non-standardized techniques such as the Taylor impact test, where specimen's final deformed geometry is used to determine the material constitutive parameters by inverse analysis. However, validation of material parameters found in this way, in terms of internal plastic strains, is an open research problem. In this work, material constitutive parameters of steel AISI 1010 found by inverse analysis from Taylor tests at ~5×103s−1 were validated. This was done by comparing the Vickers hardness profile along the axis of a deformed specimen against the numerically calculated hardness from a finite element model of the Taylor impact, which used the constitutive parameters found by inverse analysis. To map the simulated effective plastic strains found in the model into Vickers hardness, an experimentally-derived analytical relation between compressive quasi-static plastic strains and Vickers hardness on cylinders of the same material was used. It was found that the material constitutive parameters of steel AISI 1010 characterized by inverse analysis, from silhouettes of deformed Taylor tests, are capable to predict the plastic-strain distribution inside the deformed material.