Forming limits are determined by analyzing strain distributions obtained from 0.2–0.05 in. grids imprinted on blanks by photographic or electrochemical marking techniques. Failure generally occurs in a region of stretch forming where all strains are positive (tensile) in the plane of the sheet. Experimental results derived from laboratory specimens and production automotive stampings indicate a predictable critical strain level beyond which failure is anticipated. The most effective method of increasing the stretching limits is the development of a more nearly uniform strain distribution. Factors controlling this distribution are material strain hardening characteristics, die design, stamping geometry, and lubrication.


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    Title :

    Determination of Forming Limits in Automotive Stampings


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Mid-Year Meeting ; 1965



    Publication date :

    1965-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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