1997 journal article

Inelastic microstructural failure modes in crystalline materials: The Sigma 33a and Sigma 11 high angle grain boundaries

INTERNATIONAL JOURNAL OF PLASTICITY, 13(4), 403–434.

By: M. Zikry n & M. Kao n

co-author countries: United States of America 🇺🇸
author keywords: dislocations; grain-boundaries; microstructures; crystal plasticity; finite elements
Source: Web Of Science
Added: August 6, 2018

The initiation and evolution of microstructurally induced failure mechanisms in crystalline materials with coincident site lattice (CSL) high angle grain boundaries (GBs) have been investigated. A constitutive formulation that couples a rate-dependent multiple-slip crystalline formulation, through internal variables, to evolutionary equations for the mobile and immobile dislocation densities, has been developed. This dislocation-density based constitutive formulation is used with specialized computational schemes to investigate failure modes in f.c.c. crystalline materials with Σ11 and Σ33a CSL GBs. The interrelated effects of mobile and immobile dislocation densities, lattice rotation, localized plastic slip, and high angle GB misorientations on the evolution of failure modes that can occur owing to dislocation pile-ups and slip-rate blockage and transmission at the GB have been investigated. Comparisons have been made with experimental results and observations, and results from this study are consistent with experimental observations that transgranular failure can occur owing to single dislocation pile-ups at the GB for the Σ11 and Σ33a CSL GBs.