1. Department of Materials and Production Engineering, University of Naples “Federico II”, Piazzale Tecchio, 80, 80125 Naples, Italy,
2. Department of Materials and Production Engineering, University of Naples “Federico II”, Piazzale Tecchio, 80, 80125 Naples, Italy
3. Alenia Aeronautica, Viale dell'Aeronautica, 80038 Pomigliano d'Arco, Italy