Project Status: finished
The objective of the research work is to enhance the capabilities of an inverse procedure to provide more detailed material parameters describing the kinematic hardening behaviour using a modified bending-unbending device. Due to the inhomogeneous strain and stress distribution a direct approach for identification of material parameters is not suitable and thus an inverse method has to be used. Therefore punch force - punch stroke curves calculated by FE simulation are fitted iterative to experimental determined data. As a result of this inverse approach the choice of the constitutive material model is of vital importance. For this reason the impact on inverse parameter identification on the one hand and qualitiy of springback calculation on the other hand is investigated in this project.
Identification of kinematic hardening parameters based on bending-unbending test
(a) force-stroke curves vs. different material models from bending, (b) modified bending device
Wieland, M.; Kaupper, M.; Merklein, M.:
Umform- und Rückfederungssimulation von Leichtbauwerkstoffen - Vergleichende Betrachtung von Zug-Druck- und Wechselbiegeversuchen zur Berücksichtigung des Bauschinger-Effekts.
In: Europäische Forschungsgesellschaft für Blechverarbeitung (Edt.): Umformen, Schneiden, Verbinden im Leichtbau - Machbarkeit - Produktivität - Qualität - Tagungsband T36 des 33. EFB-Kolloquiums Blechverarbeitung am 16. und 17. April 2013 in Fellbach, (2013), pp. 347-357
Wieland, M.; Biasutti, M.; Kaupper, M.; Merklein, M.:
Inverse Parameteridentifikation mittels Wechselbiegeversuch zur Ermittlung der nicht isotropen Verfestigung von Blechwerkstoffen.
In: LS-DYNA Forum 2012, (2012), published
