1. Assistant Professor, Dept. of Mechanical and Aeronautical Engineering, Univ. of Patras, 26500 Patras, Greece.
2. Ph.D. Candidate, Dept. of Mechanical and Aeronautical Engineering, Univ. of Patras, Panepistioupoli Rion, 26500 Patras, Greece (corresponding author).
3. Ph.D. Candidate, Dept. of Materials Science and Engineering, Univ. of Ioannina, 45110 Ioannina, Greece.