Abstract
Various conversion methods of torque and angle of rotation to flow stress and strain are presented in the paper. These methods were verified in mathematical modelling using the finite element method. Performed investigations show that the coefficient of strain rate is the most important parameter, which is not properly implemented in currently used methods. The paper presents the results of thermo-mechanical modelling of torsion test. It is concluded on the basis of the results that temperature of the sample rises very fast when strains rate is above 1 s-1. Determined temperature distribution in cross section and in longitudinal section indicates that heat is transferred mainly into handles.