Johnson-Cook model parameters determination for 11% and 14% Mn-Steel

Abstract

The behaviour of high-manganese steel under large strains and different strain rates needs to be investigated to predict its response to various dynamic loading conditions including impact. An empirical constitutive relation developed by Johnson and Cook (JC) is applied at high strain rate and dynamic loading conditions to determine the flow stress and material strength. The deformation behaviour of two high-manganese steel cylindrical specimens (11% and 14% Mn-content) was studied using uniaxial tensile tests, compression tests at various strain rates and finite element (FE) simulation. These tests were conducted at room temperature to examine the effects of strain rate, material plasticity and strain hardening to ultimately determine the JC model parameters. Fracture appearance of tensile test specimens was also studied using optical microscopy and SEM. Results showed that 11%Mn-steel exhibited more toughness, ductility and strain hardening than 14% Mn-steel. The JC model parameters have been evaluated and represented in tabular form. Tensile tests have been compared with recent published works. Good agreement between the results has been observed.