PPT Slide
EI is the energy due to the material inside the dislocation core of radius rI.
EII is the energy contribution of the region outside the radius and inside the radius R = KD > b, where K is constant less than unity.
In this region II, the elastic strain energy contributed by other dislocations in the boundary is very small.
EII is mainly due to the plastic strain energy strain energy associated with the dislocation in the center of this portion.