Effect of geometrically necessary dislocations on inelastic strain rate for torsion stress relaxation of polycrystalline copper in micro scale

To characterize the torsion stress relaxation in micro scale, the relation between the inelastic strain rate and the geometrically necessary dislocations (GNDs) is proposed. Based on the Orowan equation, which provides the description for strain rate evolution with the influence of density and velocity of mobile dislocation, the effect of GNDs is considered when materials exhibit non-uniform deformation at small scale. Additionally, the...