A comparative study on Johnson–Cook constitutive modeling for Ti–6Al–4V alloy using automated ball indentation (ABI) technique

Abstract

In this study, automated ball indentation (ABI) technique has been employed to explore the flow behavior of Ti–6Al–4V alloy at low strain rates and elevated temperatures. Isothermal ABI tests have been performed in a wide range of temperatures (293K, 493K, 693K, and 873K) and strain rates (10−6, 10−5 and 10−4s−1). Based on the experimental true stress–plastic strain data derived from the ABI tests, Johnson–Cook (J–C) constitutive model has been employed to predict the flow behavior of Ti–6Al–4V alloy at low strain rates and elevated temperatures. A comparative study has been made to verify the applicability of current J–C models at low strain rate based on finite element method (FEM). The results show that the predicted values by the Johnson–Cook constitutive model agree well with the experimental data, and the automated ball indentation (ABI) technique could give a precise prediction of the flow behavior of Ti–6Al–4V alloy at low strain rates and elevated temperatures.