Direct multiscale modeling: Accounting for stress localization near grain boundaries

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Abstract
This article describes a modified multiscale constitutive model for analyzing the stress-strain behavior of polycrystalline materials, which explicitly accounts for the influence of grain boundary misorientation on the mechanical response. The model was implemented as a user subroutine and added to the SIMULIA Abaqus FEA software suite. A slip system compatibility factor was introduced into the hardening law via a relation for critical shear stresses, enabling the capture of interactions between dislocations and grain boundaries. The model was used in a numerical study of a generated polycrystalline structure of 308LSi austenitic stainless steel. The results of the study reveal the localization of stresses and plastic strains near high-angle grain boundaries, demonstrating the significant influence of crystallo-geometric factors on material hardening.

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