Temperature dependency of material constitutive behaviour: A simple model

The realisation that the temperature in the stamping process plays an important and underestimated role is gaining recognition. In the ASPECT project [1] the implications of temperature on friction and material behaviour are modelled and used to design a control algorithm. Although the influence of temperature on the process is mainly via friction the change in material behaviour cannot be neglected. Tata Steel have long been advocates of dislocation physics based constitutive models and in this conference the results of the current modelling approach with temperature influence in the dynamic stress are presented [2] as well. For even higher accuracy a temperature influence on the static hardening part of the model can be taken into account [3] but those are in differential equation form and need to be continuously evaluated in the FEA algorithm which means adaptations in the source code. In this paper a simplified approach based for temperature influence on static hardening is presented that can be written in a closed form and thus be supplied as (tabular) hardening law to any desired FEA code.