Dislocation-disclination models were developed for ferro-elastic domain walls (twin walls). The models were used to calculate the long-range stress fields which were created by curved walls and to evaluate the associated elastic energy. The equilibrium trajectories of the walls for 2 basic domain-wall configurations (corner and kink) were analysed by minimizing the total energy of the system. This was the sum of the domain-wall self-energy and the elastic energy which was stored in the surrounding medium. It was shown that, by introducing a characteristic length, it was possible to reveal the universal features of domain-wall trajectories in ferro-elastic crystals.

Long-Range Elastic Interactions and Equilibrium Shapes of Curved Ferroelastic Domain Walls in Crystals. N.A.Pertsev, J.Novak, E.K.H.Salje: Philosophical Magazine A, 2000, 80[9], 2201-13