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    STP647

    Predicting Sheet Anisotropy from the Fracture Angle of Tension Specimens

    Published: 01 July 1978


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    Abstract

    Fracture angles and plastic strain ratios (r values) for aluminum alloys 2036-T4, 3004-H19, 5182-O, and 5352-H19 were determined and compared to the theoretical relationship between localized necking angle and r value. Data determined for 3004-H19 and 5352-H19 specimens, which exhibit minimal diffuse necking prior to localized necking, follow the theoretical relationship, while data determined for 2036-T4 and 5182-O specimens, which exhibit considerable diffuse necking, do not. Empirically determined fracture angle correction terms were developed for 2036-T4 and 5182-O to permit reasonable estimates of r based on the theoretical relationship.

    Keywords:

    metal forming, formability, aluminum alloys, anisotropy, plastic strain, fracture properties, fracture tests, tension tests, necking


    Author Information:

    Lege, DJ
    Engineer, Aluminum Company of America, Pa


    Committee/Subcommittee: E28.06

    DOI: 10.1520/STP30047S