1. a Mechanical, Modeling and Manufacturing Unit, National Engineering School of Sfax (ENIS) , BP 1173 – 3038 , Sfax , Tunisia
2. b Laboratory of Engineering of the Mechanical Structures and Materials , High Institute of Mechanic of Paris (SUPMECA) , 3, rue Fernand Hainaut, 93407 , Saint-Ouen , Cedex , France