ESSENTIAL WORK OF FRACTURE CONCEPT INPOLYMERS;Experimental study of the superplasticity of mg alloy;Evaluation of press formability in magnesium alloy; Finite element analysis of the formability of an austenitie stainless steel sheet in warm deep drawing; Forming limit diagram for 6016-T4 aluminium alloy deformed along linear and complex strain paths; From 3-D Nonlinear Elasticity Theory to I-D Barswith Nonconvex Energy