Binder wrap forming for automobile body panels can be evaluated by finite element analysis. Sometimes, however, numerical instabilities occur in the implicit nonlinear solution process. While this instability may be an artifact of the numerical model, it may also signal the onset of a real physical phenomenon, such as bifurcation. This paper presents a numerical experiment to examine bifurcation in binder wrap forming, using an experimental decklid die. Numerical instability occurred early in the deformation process. Two stable solutions for the binder wrap surface were obtained, demonstrating that the instability resulted from bifurcation. One of the deformation modes is saddle like, and the other is cylindrical. In practice, the blank will deform to one of the above modes under the clamping actions generated by the closing of the binders. If the deformation takes the other mode, substantially different strains will result in the subsequent punch forming.


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    Titel :

    Bifurcation in binder wrap forming


    Weitere Titelangaben:

    Gabelung beim Umformen von Blechteilen


    Beteiligte:
    Chen, Kuo-Kuang (Autor:in) / Baran, D.F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1993


    Format / Umfang :

    7 Seiten, 16 Bilder, 7 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Bifurcation in binder wrap forming

    Chen,K.K. / Baran,D.F. / General Motors Research,US et al. | Kraftfahrwesen | 1993


    Bifurcation in Binder Wrap Forming

    Baran, Dennis F. / Chen, Kuo-Kuang | SAE Technical Papers | 1993




    Applications of a Binder Wrap Calculation Model to Layout of Sheet Steel Forming Dies

    Chen, Kuo-Kuang / Waugh, Thomas G. | SAE Technical Papers | 1990