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Most of crystalline materials develop an hysteresis on their deformationcurve when a mechanical loading is applied in alternating directions. Thiseffect, also known as the Bauschinger effect, is intimately related to thereversibile part of the plastic deformation and controls the materials damageand ultimately their failure. In the present work, we associate mesoscaleDislocation Dynamics simulations and Finite Element simulations to identify twooriginal dislocation mechanisms at the origin of the traction/compressionasymmetry and quantify their impacts on the cyclic behaviour of FCCsingle-crystals. After demonstrating that no long-range internal stresses canbe measured in the simulations, careful analysis of the dislocation networkshow that the Bauschinger effect is caused by an asymmetry in the stability ofjunctions formed from segments whose curvature is determined by the appliedstress, and a significant portion of the stored dislocation segments is easilyrecovered during the backward motion of dislocations in previously exploredregions of the crystal. These mechanisms are incorporated into a modifiedcrystal plasticity framework with few parameters quantified from statisticalanalysis of Dislocation Dynamics simulations or from the literature. Thisstrategy has a real predictive capability and the macroscale results are ingood agreement with most of the experimental literature existing on theBauschinger and cyclic deformation of FCC single-crystals. This work providesvaluable mechanistic insight to assist in the interpretation of experiments andthe design of structural components to consolidate their life under cyclicloading.

A Multiscale Investigation of the Physical Origins of Tension--Compression Asymmetry in Crystals and their Implications for Cyclic Behavior