CALCULATION OF LIMIT LOADS OF AN ELASTOPL ASTIC STRUCTURE SUBJECT TO PLANE STRESSES

In this paper we present a new caracterization of the the limit loads of an elastoplastic structure governed by a plane stresses Hencky mode l. Each one of these limit loads amounts to be the infimum value inver t of a nondifferentiable minimization problem over the space of self e quilibrated stress fields. To compute these limit loads, we propose a regularization method which seems like the one used for the generalize d Norton-Hoff material in the work of FRIAA [7].