1. FACT Future Advanced Composites and Technology GmbH, Hertelsbrunnenring 9, D-67657 Kaiserslautern, Germany, Institut für Verbundwerkstoffe GmbH, Erwin-Schrödinger-Strasse Geb. 58, D-67663 Kaiserslautern, Germany, and Department of Engineering Physics and Mathematics and Center for New Materials, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Espoo, Finland