Multiple-slip dislocation-density based computational schemes that were coupled to grain-boundary interfacial schemes, and to an internal porosity formulation, were used to analyze the behavior and interaction of various arrangements and geometries of explicit pairs of voids in a polycrystalline face-centered cubic aggregate. The grain-boundary regions were treated as possessing properties and topologies that were distinct from that of the bulk grain. The grain-boundary kinematic scheme accounted for dislocation density interactions with grain boundaries: such as dislocation density impedance, blockage and grain-boundary absorption. These changing interfacial conditions were monitored during deformation. The results indicated that void-to-void interactions resulted in dislocation density evolution and saturation, and porosity localization, that were closely 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[31-34], 3917-44