Dislocation density based modelling of electrically assisted deformation process by finite element approach

Abstract

Application of electric current, while deforming the material is known to aid the deformation process due to electroplastic effect. The experimentally observed behaviour during the application of electric current is generally correlated to the combined effect of Joule heating and localized electron–dislocation interaction. As the governing mechanism of electroplasicity lacks consensus, constitutive modelling of the said behaviour is challenging and scarce. The mathematical models reported in the literature often found to describe the electrically assisted deformation behaviour by only considering Joule’s heating effect. A fully coupled thermal–metallurgical model is required to underpin the mechanism of electrically assisted deformation process. In this work, we are presenting a novel strategy to predict the electrical assisted deformation process by developing a fully coupled thermal and dislocation density based constitutive model. This modelling approach is implemented in a commercial finite element software using subroutines. The implemented model is evaluated to predict the electrical assisted deformation behaviour of aluminium alloys subjected to both continuous and pulsed current. The implemented model is able to successfully simulate the electrical assisted deformation process.