Spacing based on insertion of the last dislocation

In providing an answer to the question, three independent equilibrium stress fields must be considered, rather than the two fields considered in similar cases up to this point. These equilibrium fields are the background mismatch field characterized by Tm or ym, the net field of all previously 

All three contributions to the driving force G defined in (7.8) are now known in terms of h and p. If the available energy supply is more than adequate to drive the formation of the last dislocation in the array, then conditions are such that G 0. On the other hand, if the energy supply is inadequate, G 0 and any threading dislocation inserted will retract rather than advance. The critical or discriminating condition between these two types of behavior is defined by G = 0 or 

This result can be compared directly with similar results obtained 

---