Hot-formed steels (here called 'Boron steels') offer a great weight saving potential versus conventional cold-formed steels used for crash relevant structural parts. Boron steels allow complex shaped parts due to the hot-forming process, which can be a direct or indirect process. In the direct hot forming process first the sheet metal with an initial yield strength of around sigma(indy) = 400 MPa is blanked and then heated in an oven up to some 950 deg C. In the next step the 'hot' sheet metal is stamped and at the same time rapidly cooled down (quench hardening process) in the stamping die. During this process the yield strength increases up to approximately sigma y > 1100 MPa in the final stamped part. Due to the enormous strength and the very good dimensional control (nearly no springback), more and more hot-formed parts are used in vehicle design. Especially in the body structure hot-formed steels are used for crash relevant parts. However the quench hardening process causes a significant reduction of the material ductility. The designer has to ensure via crash simulation that the crash impact can be handled without fracture of the Boron steel component. The prediction of the deformation and fracture behavior therefore is one of the major interests during the vehicle development process. The paper will give an overview on: material properties of Boron steels, a failure modeling approach for crash simulation, the validation of the failure modeling approach, application examples that demonstrate the lightweight potential of Boron steels for structural applications and the benefit of the chosen simulation approach.


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    Titel :

    Failure prediction of hot-formed steels in crash


    Weitere Titelangaben:

    Versagensbewertung von warmgeformten Bauteilen im Crash


    Beteiligte:
    Lanzerath, Horst (Autor:in) / Bach, Aleksander (Autor:in) / Schilling, Robert (Autor:in) / Oberhofer, Gernot (Autor:in) / Gese, Helmut (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    26 Seiten, 22 Bilder, 5 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Failure prediction of hot formed steels in crash

    Lanzerath,H. / Bach,A. / Schilling,R. et al. | Kraftfahrwesen | 2006


    Failure Prediction of Hot-Formed Steels in Crash

    Lanzerath, H. / Bach, A. / Schilling, R. et al. | British Library Conference Proceedings | 2006


    Failure Prediction of Boron Steels in Crash

    Lanzerath, H. / Bach, A. / Oberhofer, G. et al. | British Library Conference Proceedings | 2007


    Failure prediction of boron steels in crash

    Lanzerath,H. / Bach,A. / Oberhofer,G. et al. | Kraftfahrwesen | 2007


    Failure Prediction of Boron Steels in Crash

    Bach, Aleksandar / Oberhofer, Gernot / Gese, Helmut et al. | SAE Technical Papers | 2007