Inserted: 13 mar 2017
Last Updated: 2 mar 2018
Journal: Calc. Var. Partial Differential Equations
In ADGP a simple discrete scheme for the motion of screw dislocations toward low energy configurations has been proposed. There, a formal limit of such a scheme, as the lattice spacing and the time step tend to zero, has been described. The limiting dynamics agrees with the maximal dissipation criterion introduced in CG and predicts motion along the glide directions of the crystal. In this paper, we provide rigorous proofs of the results in ADGP, and in particular of the passage from the discrete to the continuous dynamics. The proofs are based on Gamma-convergence techniques.