A multiple-slip dislocation-density based formulation, and computational schemes that were coupled to grain-boundary interfacial schemes and an internal porosity formulation, were used to analyze various arrangements and geometries of pairs of voids in a polycrystalline face-centered cubic aggregate. The grain-boundary regions were treated as being volumes with properties and topologies that were distinct from those of the grain bulk. The grain-boundary kinematics accounted for dislocation density interactions with grain-boundaries: such as, dislocation density impedance, blockage and grain-boundary absorption. The evolving interfacial conditions were monitored throughout the deformation. The analysis indicated that void-to-void interactions resulted in dislocation density evolution and saturation, and porosity localization, that were intimately related to dislocation density pile-ups and blockages at grain-boundary interfaces, and to grain-boundary absorption within various grain-boundary regions.

Grain-Boundary Interfaces and Void Interactions in Porous Aggregates. W.M.Ashmawi, M.A.Zikry: Philosophical Magazine, 2003, 83[31], 3917-44