Development of a computer code for the interpretation of results of hot plane strain compression tests

In the present work an investigation of constitutive equations is made to o btain good fit to experimental data and ensure proper extrapolation out of experimental range of plane strain compression tests to low and high values of Zener-Hollomon parameter, which are required in finite element modellin g. A computer program for optimisation of rheological parameters,of materia l was developed. Optimisation using experimental data for two ultra low car bon steels was made and the results are compared with measured stress-strai n curves. The obtained constitutive equations were used in the finite eleme nt model and comparison between experimental and computed displacement-forc e curves is made. The influence of inhomogeneity of strain rate, strain and temperatures distribution during compression tests on flow curves is illus trated.