1. Wrocław University of Science and Technology, Faculty of Mechanical Engineering, Department of Mechanics, Materials Science and Engineering, M. Smoluchowskiego 25, 50-370 Wrocław, Poland
2. Wrocław University of Science and Technology, Faculty of Mechanical Engineering,Department of Materials Science, Strength of Materials and Welding, M. Smoluchowskiego 25, 50-370 Wrocław, Poland