A study of grain and grain-boundaries based on a gradient crystal-plasticity model

Abstract eng:
In this study, a well-defined finite-deformation gradient crystal-plasticity model which has been proposed by Gurtin [l] is employed and represented with respect to the reference configuration to study size-dependent hardening behavior of a single crystal. A recoverable defect-energy which incorporates geometrically necessary dislocation (GND) density is introduced. The constitutive model is implemented in the finite-element software ABAQUS via a user-defined subroutine (UEL). The primary aim of the current study is an understanding of effect of energetic and dissipative gradient- strengthenings as well as self- and latent-hardening in stress-strain response of a single crystal. Rate and size-dependent responses along with Bauschinger-like behavior under a cyclic simple-shear loading are investigated. Moreover, plastic flows in predefined slip systems and accumulation of GNDs are distinctly observed. This constitutive model is further developed for multicrystals. Penetration of dislocations through soft boundaries and accumulation of GNDs at hard

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