The regionalized modelling and simulation of the micro-tensile process based on 3D Voronoi model

Abstract

In this work, a regionalized constitutive model based on the surface layer model and intragranular heterogeneities was established. The crystal plasticity simulations of the micro-tensile processes were implemented based on 3D Voronoi model. By applying the proposed constitutive model and the 3D polycrystalline structure, the micro-tensile tests of pure copper were numerically simulated by finite element methods. Through the combination of constitutive model and crystal plasticity finite element simulations, the flow stress-strain curves under different grain sizes and orientations were obtained. Thus, to verify the proposed model, a set of micro-tensile tests of pure copper were carried out to investigate the size effect of deformation behavior. It is found that the simulation results are in good agreement with the experimental results, which confirmed the accuracy of the established regionalized constitutive model and the 3D polycrystalline geometric model. The modeling method proposed in this paper opens new avenues for further insights of the size effect in micro-forming process.