1. Professor, Dept. Mechanics and Materials, NOEL Natural Ocean Engineering Laboratory, Mediterranea Univ., 89122 Reggio Calabria, Italy (corresponding author).
2. Professor, Dept. Mechanics and Materials, NOEL Natural Ocean Engineering Laboratory, Mediterranea Univ., 89122 Reggio Calabria, Italy.
3. Researcher, Dept. Mechanics and Materials, NOEL Natural Ocean Engineering Laboratory, Mediterranea Univ., 89122 Reggio Calabria, Italy.