KurzfassungBei der Untersuchung von Stahlfeinblechen wurde ein Näherungsverfahren entwickelt, bei dem das bestehende Kennwertesystem ersetzt und die Neigung der plastischen und elastischen Gerade im Manson-Coffin-Diagramm nicht mehr als konstant angenommen wird. Die „Method of Variable Slopes (MVS)“ benötigt zur Bestimmung der zyklischen Kennwerte lediglich die Zugfestigkeit und den Elastizitätsmodul des Werkstoffes sowie den Vergleichsumformgrad, wenn eine Blechumformung vorliegt. Die Übertragung dieser Methodik auf das „Uniform Material Law (UML)“ führt zu einer Verbesserung der Abschätzung zyklischer Kennwerte von Werkstoffen und Halbzeugen der Datensammlung „Materials Data for Cyclic Loading“ von Boller, Seeger und Bäumel.
For the past few years the customer's demand for more fuel efficient and at the same time safer vehicles has steadily increased. Consequently, light weight design has become one of the main interests in engineering. With regard to sheet metal components, a new class of high manganese steels, based on the TWIP (twinning induced plasticity) effect, provides the opportunity of shaping light weight designed thin and complex sheet metal geometries with advanced crash performance. In terms of weldability, due to their thermo-physical properties (high content of C, Mn, Al, Si), FeMn steels have to be handled differently in comparison to conventional steel grades. Particularly dissimilar material combinations of FeMn and ferrite steels are in the center of interest for industrial applications. This study reveals that metallurgical properties of dissimilar welding seams can be influenced considerably by laser beam welding, resulting in a change of the mechanical properties of the seam which is practicable without using filler material as described in (Flügge et al., 2011).
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