1. Chair of Mechanics and Materials; ETH Swiss Federal Institute of Technology; Zürich 8092 Switzerland
2. Centre of Structure Technologies; ETH Swiss Federal Institute of Technology; Zürich 8092 Switzerland
3. Swiss Federal Laboratories for Materials Science and Technology; EMPA; Dübendorf 8600 Switzerland
4. California Institute of Technology; Graduate Aerospace Laboratories; Pasadena CA 91125 USA