|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Accounting for the Micromechanical Effect of Grain Boundaries Using a New FFT-based Strain-gradient Polycrystal Plasticity Formulation
||Ricardo Lebensohn, Alan Needleman
|On-Site Speaker (Planned)
In this work we present a novel implementation of Gurtin's strain-gradient polycrystal plasticity theory to study the micromechanical effect of grain boundaries (GBs). Bittencourt et al's (2003) non-local formulation has been incorporated in Lebensohn et al's (2012) EVP-FFT algorithm. Numerical procedures for the accurate estimation of higher-order derivatives of micromechanical fields, required for feed-back into single crystal constitutive relations, are identified and applied. A simple case of a periodic laminate is used to assess the numerical stability of the algorithm and to study the influence of the different model parameters. The new formulation is next applied to the case of a 3-D fcc polycrystal, accounting for non-local effects associated with GBs and illustrating the possibilities offered by the proposed numerical scheme to accurately solve large problems in reasonable computing times.