1. Laboratory of Microstructures and Mechanics of Materials, LM3/ENSAM/PARIS/CNRS URA 1219, 151, Boulevard de l'Hôpital, 75013 Paris, France
2. DR/Materials Modelisation, RENAULT/D.I.V-D.MATT-Sce 60152, 8/10, Avenue Emile Zola, 92109 Boulogne Billancourt, Cedex France