Dislocation impediment by the grain boundaries in polycrystals

Abstract

Thermodynamic dislocation theory incorporating dislocation impediment by the grain boundaries is developed to analyze the shear test of polycrystals. With a small set of physics based material parameters, we are able to simulate the stress-strain curves for the load and its reversal, which are consistent with the experimental curves of Thuillier and Manach [2009]. Representative distributions of plastic slip under load and its reversal are presented, and their evolution explains the extended length of the transition stage during load reversal.

arXiv comment29 pages, 15 figures

References in corpus (6)

• Thermodynamically consistent continuum dislocation dynamics
• Thermodynamic dislocation theory of high-temperature deformation in aluminum and steel
• Thermodynamic theory of crystal plasticity: formulation and application to polycrystal fcc copper
• Thermodynamic theory of dislocation-enabled plasticity
• Thermodynamic dislocation theory: Bauschinger effect
• Thermodynamic dislocation theory: torsion of bars