We have employed Hill's 1948 yield criterion to predict the forming limit curve for planar anisotropic sheet materials by using bifurcation theory. The effects of the material anisotropic parameters, R0, R45 and R90, on the orientation of the neck and the forming limit diagram are analyzed in a systematic manner. It is found that in biaxial stretching, the value of R0 significantly affects the limit strains, whereas R90 has a small contribution. On the other hand, R45 has no effect on the limit strains. In a drawing mode of deformation, the effects of the R's on the limit strains are insignificant. The calculated shear band (or localized neck) is assumed to take place along the zero-extension direction independently of the R values. In the case of biaxial tension deformation, the neck will always form along a principal direction. For a sheet material whose anisotropic parameter R in the major strain direction is smaller than that in the minor strain direction, the neck will form along the major strain if the state of deformation is in the vicinity of equal-biaxial stretching. In all other cases the neck will form along the minor strain direction. The forming limits as predicted by this model agree well with experimental data.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Predicting the Forming Limit Diagram (FLD) for Sheet Metals with Planar Anisotropy


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Aifantis, E.C. (Autor:in) / Majlessi, S.A. (Autor:in) / Zhu, X.H. (Autor:in)

    Kongress:

    International Congress & Exposition ; 1998



    Erscheinungsdatum :

    23.02.1998




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Predicting the forming limit diagram (FLD) for sheet metals with planar anisotropy

    Zhu,X.H. / Majlessi,S.A. / Aifantis,E.C. et al. | Kraftfahrwesen | 1998


    Verification of crystallographic texture based forming limit diagram predictions for aluminium sheet

    Zonker,H.R. / Brem,J.C. / Morson,J.L. et al. | Kraftfahrwesen | 1995


    Prediction of Forming Limit Diagram with Damage Analysis

    Chow, C. L. / Yu, L. G. / Demeri, M. Y. | SAE Technical Papers | 1996


    Forming limit at sheet metal forming

    Tmej, J. / Mikes, V. / Buchar, Z. | Tema Archiv | 1989


    Prediction of forming limit diagram with damage analysis

    Chow,C.L. / Yu,L.G. / Demeri,M.Y. et al. | Kraftfahrwesen | 1996