STP753

    Effects of Strain-Hardening Representation in Sheet Metal Forming Calculations of 2036-T4 Aluminum

    Published: Jan 1982


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    Abstract

    This paper describes numerical results from finite element modeling of several standard sheet metal forming tests of 2036-T4 aluminum, using two hardening representations, namely, the conventional power law model and a saturation stress model. Both hardening models are acceptable based on their fit to uniaxial tensile data for strains up to 0.18, but their behaviors at the large strain values typical in sheet metal forming are quite different. The forming tests calculated in this paper are: (a) a uniaxial tension test, (b) the hydraulic bulge test, (c) hemispherical punch stretching, and (d) cup drawing with a hemispherical headed punch. The results obtained from the two hardening models differ substantially, indicating that an accurate description of material hardening behavior is important for the numerical modeling of sheet metal forming operations. Comparison of the calculated results with existing experimental data in the uniaxial tension test suggests that the saturation stress model is currently a better choice for representing 2036-T4 aluminum.

    Keywords:

    strain hardening, 2036-T4 aluminum, sheet metal forming, formability tests, finite element modeling, formability


    Author Information:

    Wang, NM
    Departmental research scientist and senior staff research engineer, General Motors Research Laboratories, Warren, Mich.

    Wenner, ML
    Departmental research scientist and senior staff research engineer, General Motors Research Laboratories, Warren, Mich.


    Paper ID: STP28388S

    Committee/Subcommittee: E28.02

    DOI: 10.1520/STP28388S


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