1. Institute of MechanicsTU Dortmund Leonhard‐Euler‐Str. 5 44227Dortmund Germany
2. Institute of Mechanics and Fluid DynamicsTU Bergakademie Freiberg Lampadiusstr. 4 09599Freiberg Germany
3. Division of Solid MechanicsLund UniversityP.O. Box 118 22100Lund Sweden