Screw dislocation in semi-infinite non-local hexagonal medium
Journal
Radiation Effects and Defects in Solids
Journal Volume
133
Journal Issue
2
Pages
167-178
Date Issued
1995
Author(s)
Pan, K. L.
Abstract
Abstract Nonlocal stresses of a screw dislocation near a free surface in a semi-infinite hexagonal medium are investigated by a surface dislocation model. The nonlocal image force on the screw dislocation due to the existing free surface is also obtained. All classical singularities for the stress and image force are eliminated. The maxima of the stress and image force are evaluated. A zero point of the stress is found, which predicts that different states of the shear stress exist simultaneously near the dislocation. The appearance of a zero value at the free surface and a maximum of the dislocation image force can be used to explain the existence of the dislocation free zone.
Type
journal article