Dislocation emission from nanovoid with the effect of neighboring nanovoids and surface stresses

• Analyze nanovoid growth by the dislocation emission.
• Suggest a self-consistent model to quantitatively show neighboring nanovoids effect.
• A relatively simple and closed-form solution of the critical stress is derived.
• Take into account effect of surface stresses, size and volume fraction of nanovoid.
• Consider effect of growth/shrinkage of neighboring nanovoid, remote applied stress.

In the light of the vital mechanism for nanovoid evolution depending strongly on the effect of neighboring nanovoids, a generalized self-consistent model is suggested to describe nanovoid growth by the dislocation emission from nanovoid surface accounting for the effect of neighboring nanovoids and surface stresses in ductile porous materials. The explicit solution of the critical stress for dislocation emission is derived by means of the complex variable method. Analysis shows the advanced model can be implemented as the effective means to address the strong dependence of the nanovoid growth by the dislocation emission upon the size and volume fraction of nanovoid, growth/shrinkage of the neighboring nanovoid, remote applied stress as well as the surface effect.