Edge dislocation emission from nanovoid with the effect of neighboring nanovoids and surface stress

摘要

Experimental evidence,molecular dynamics simulations and theoretical analyses of nanovoid growth and coalescence in ductile materials indicate that nanovoid growth,coalescence,and stain localization depend strongly on distribution and volume fraction of the nanovoids in ductile porous materials.In the light of this mechanism,a generalized self-consistent theoretical model to describe the dislocation emitted from nanovoid accounting for the effect of neighboring nanovoids is suggested.The explicit solution to the critical stress is derived by means of the complex variable method.The influence of the nanovoid size,the surface effect,nanovoid content and uniform distribution density of neighboring nanovoids in the effective medium on the critical condition required for dislocation emission from nanovoid surface is discussed.