1 Postdoctoral associate, Solid Mechanics Laboratory (UMR CNRS 7649), Ecole Polytechnique, Palaiseau, France 2 EADS Innovation Works, Toulouse, France, {laurent.chambon,damien.crozes}@eads.net 3 Department of Structural Engineering, Politecnico di Milano, Milan, Italy, [email protected] 4 Solid Mechanics Laboratory (UMR CNRS 7649), Ecole Polytechnique, Palaiseau, France, [email protected]...