Mechanical properties of two kinds of auto-body steel sheets are presented over a wide range of strain rates and temperatures. Tensile tests were conducted at different strain rates and temperatures to determine constitutive models for the two materia...
Mechanical properties of two kinds of auto-body steel sheets are presented over a wide range of strain rates and temperatures. Tensile tests were conducted at different strain rates and temperatures to determine constitutive models for the two materials. At high temperature, strain rate sensitivity is negative and Portevin?Le Chatelier effect is observed because of dynamic strain ageing (DSA). Widely known constitutive models such as Zerilli-Armstrong and Khan-Huang-Liang models cannot describe DSA effect. Therefore, the models are modified in order to describe material strengthening due to DSA at high temperature. The modified constitutive models give good correlations with experimental data over a wide range of strain rates and temperatures including the range in which material strengthening due to DSA occurs.