1. Stability and Failure of Functionally Optimized Structures, Institute of Mechanics, Technische Universität Berlin, Einsteinufer 5, 10587 Berlin, Germany
2. Polymer Materials and Technologies, Institute of Material Science and Technology, Technische Universität Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
3. Department of Materials Science and Engineering, Division of Applied Mechanics, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1, Box 35, 751 03 Uppsala, Sweden