Dislocation Transport in Continuum Crystal Plasticity Simulations (First-year Report)

Report No. ARL-MR-0799
Authors: Richard Becker
Date/Pages: December 2011; 32 pages
Abstract: Continuity of dislocation flux across element boundaries is introduced into a non-local, explicit finite element code using a continuum crystal plasticity constitutive model. In addition to providing enhanced coupling of the deformation field among neighboring elements, dislocation fluxes are integrated through time to give an estimate of dislocation gradients that serve as a strengthening mechanism. The results demonstrate the effects of dislocation flux continuity and the realization of a size scale associated with the gradient hardening. Numerical issues relating to spatial oscillations are identified for future work.
Distribution: Approved for public release
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Last Update / Reviewed: December 1, 2011