1. Unit of Mechanics of Lille (UML EA 7512), Cité scientifique, University of Lille 1, Villeneuve d’Ascq Cedex, France
2. School of Advanced Engineering Studies (HEI), BP 41290, Lille Cedex, France
3. Preparatory Institute for Engineering Studies of Tunis El Manar, University of Tunis El Manar, LR MAI–ENIT, BP-37, Le Belvédère 1002, Tunisia