<strong>Development of improved method for determination of forming limit curves for sheet material</strong>

  • Danckert, Joachim (Projektdeltager)



    In the development of new complex sheet metal components of thin sheet metals such as steel and aluminium, Finite Element (FE) simulation is used to predict the robustness of the sheet forming process with respect to material fracture and geometric accuracy etc. The strains predicted by simulations are compared to the specific materials forming limit, the so-called Forming Limit Curve (FLC). If all predicted strains are below this limiting curve, the process is considered to be safe and the very expensive forming tool can be designed and manufactured. If the predictions turn out to be wrong i.e. that material fracture occurs or the strains are close to the forming limit, the result may be large scrap rates, tool modifications and perhaps delays in the time to market for the new product. It is therefore, of large economic interest that the used FLC's are accurate.

    The purpose of the project is to investigate if the ISO/CD 12004-2 proposal (Metal materials - Sheet and strip - Determination of forming limit curves - Part 2: Determination of forming limit curves in the laboratory) can be used to determine FLC's of aluminium and high strength steel, and to comment the ISO-proposal.

    Duration of the project: 2007-2008.

    Partners is the project: 1) KIMAB, Sweden, 2) IUC, Sweden, 3) SSAB Tunnplåt AB, Sweden, 4) Volvo Cars, Sweden, 5) Outokumpo Avesta, Finland, 6) HAMK University, Finland, 7) Ravtaruukki Oyj, Finland, 8) Grundfos A/S, Denmark, 9) Aalborg University, Denmark.

    The project is co-financed by Nordic InnovationsCenter.

    Joachim Danckert

    Effektiv start/slut dato01/01/200731/12/2008


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