Abstract
This study examines the micromechanics of dislocation loop emission, aiming at determining the threshold condition associated with microvoid growth. The closed form of threshold stress is obtained for edge dislocation in the vicinity of cylindrical void in a general planar macroscopic stress state. The effects of surface energy and lattice friction are accounted for; the former is found to be significant. A prolate-to-oblate shape transition in uniaxial strain due to a higher driving force on slip plane transverse to the loading direction is observed. In the asymptotic condition of a large void, threshold condition is dictated by planar mean stress for general macroscopic stress state.
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