Modeling on strain softening and Portevin-Le Chatelier effect in crystalline materials based on mesoplasticity

摘要

A lattice model for investigation of strain soften phenomenon and meso-scale plastic deformation instabilities of polycrystalline material in tension is proposed. The modelling approach is constructed on the basis of the physical observation of mesoscopic deformation mechanisms, the microstructure information at sub-grain scale and mesoplasticity of the crystalline. Inhomogeneous physical properties of microstructure are induced by a statistical consideration to the model. Portevin-Le Chatelier (PLC) effects are simulated by this simple model. Numerical results showed that this simple lattice model captures most of the PLC features and consistent with experimental data.