By using an experimental die for fender panel, the investigation is carried out on what properties have the large infuence on surface deflections such as an undesired localized bend of sheet in the cavity after blank-holding and wrinkles caused by non uniform stretching. The localized bend at the instant of its occurrence is more marked in materials with low yield strength. This deflect, however, disappears soon when the punch for fender panel begins to form the sheet. The relation between the tendency of the loaclized bend and material properties is also examined by a simplified simulation test including theoretical analysis. The results of the examination confirm the tendency observed informing of fender panel described above. The wrinkling which is caused by non uniform stretching grows in an early stage of forming, in particular, largely in the case of materials with hgih yield strength. This wrinkle, then, reduces with the increase of punch travel. It is observed that the major principal stress along the longitudinal direction of the wrinkle produces the shrinking in its transverse direction and that this shrinking absorbs the wrinkle. Therefore, the high r value is considered to be favourable for diminishing the wrinkle effectively.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    The studies on surface deflections in forming of autobody outer panels


    Additional title:

    Untersuchungen zu den Oberflaechendurchbiegungen der aeusseren Karosseriebleche
    Titel japanisch


    Contributors:
    Hayashi, Y. (author) / Takagi, M. (author)


    Publication date :

    1981


    Size :

    8 Seiten, 17 Bilder, 2 Tabellen, 13 Quellen


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    Japanese




    Shape Control of Aluminum Outer Autobody Panels

    Daniel, D. / Aluminum Association | British Library Conference Proceedings | 1997


    Dynamic denting of autobody panels

    Burley,C.E. / Niemeier,B.A. / Koch,G.P. et al. | Automotive engineering | 1976


    Dynamic Denting of Autobody Panels

    Niemeier, B. A. / Burley, C. E. / Koch, G. P. | SAE Technical Papers | 1976


    Simulation of the forming process for irregularly shaped autobody panels

    Hora, P. / Vu, T.C. / Wollrab, P.M. et al. | Tema Archive | 1987


    Recent developments in joining autobody panels

    Delany, F. | Tema Archive | 1992