Por: Jakob Kraner (Institute of Metals and Technology, Lepi pot 11, SI-1000 Ljubljana, Slovenia ), Irena Paulin (Institute of Metals and Technology, Lepi pot 11, SI-1000 Ljubljana, Slovenia ), Matjaž Godec (Institute of Metals and Technology, Lepi pot 11, SI-1000 Ljubljana, Slovenia ), Heinz Palkowski (Department of Metal Forming and Processing, Institute of Metallurgy, Faculty of Natural and Materials Science, Clausthal University of Technology, Robert-Koch-Straße 42, DE-38678 Clausthal-Zellerfeld, Germany), Goran Kugler (DepartmEnt of Materials and Metallurgy, Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva cesta 12, SI-1000 Ljubljana, Slovenia ), Peter Fajfar (DepartmEnt of Materials and Metallurgy, Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva cesta 12, SI-1000 Ljubljana, Slovenia )