1. Institute of Solid Mechanics, Department of Mechanical Engineering; Braunschweig University of Technology; Braunschweig 38106 Germany
2. Machine Design, Department of Management and Engineering; The Institute of Technology, Linköping University; Linköping 58183 Sweden
3. Solid Mechanics, Department of Management and Engineering; The Institute of Technology, Linköping University; Linköping 58183 Sweden