1. Department of Mechanics, Materials Science and Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, Wroclaw 50-370, Poland e-mail:
2. General Tadeusz Kosciuszko Military Academy of Land Forces, Czajkowskiego 109, Wroclaw 51-150, Poland e-mail:
3. Faculty of Technology and Engineering, Wroclaw University of Science and Technology, Armii Krajowej 78, Walbrzych 58-302, Poland e-mail: