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Dislocation model for Yield and Plastic Deformation
· In the dislocation model, instead of thinking about the local
atomic structure of dislocations, the dislocation line , characterized
by the line
vector, t, and the Burgers
vector, b, will be considered
in an elastic
continuum.
· Three
conditions must be satisfied if this continuum dislocation model is
to explain plastic deformation:
* The
dislocation line must experience a force in the presence of a stress field.
* A self-regenerating source of
dislocations on a single slip plane must be present, and:
* The critical
shear stress for dislocation
multiplication must be about (G/104), where G is the shear modulus of the
matrix.
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