A Nonlinear Variational Model of Cracks and Dislocations *G. Engrand (Université Paris-Saclay, ONERA, CNRS, LEM), A. Ruffini (Université Paris-Saclay, ONERA, CNRS, LEM), Y. Le Bouar (Université Paris-Saclay, ONERA, CNRS, LEM), A. Finel (Université Paris-Saclay, ONERA, CNRS, LEM)