Determination of Ductility for Bulk Deformation

    Published: Jul 1978

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    The possibility of predicting the onset of fracture in bulk deformation processes from ductility parameters determined in simple tests was investigated by performing uniaxial tension, plane-strain tension, partial-width indentation, and secondary tension tests on 6061 aluminum, 1020 and 1045 steels, and lead. Limiting strains were correlated with those measured in upsetting with sticking at the end face and in rolling. Uniaxial tension was inapplicable, but the other tests showed reasonable agreement with a ductility criterion giving a ½ slope in a major (tensile) versus minor (compressive) strain plot, at least for isotropic materials. Normal anisotropy made the relationship invalid, with a much larger compressive or rolling strain attainable when the plastic strain ratio (r value) was less than unity.


    fracture properties, deformation, workability, ductility, ductility tests, tension tests, forgeability, upset forging, metal rolling, anisotropy, formability

    Author Information:

    Woodall, SM
    Graduate student and professor, University of Waterloo, Waterloo, Ont.

    Schey, JA
    Graduate student and professor, University of Waterloo, Waterloo, Ont.

    Committee/Subcommittee: E28.02

    DOI: 10.1520/STP30053S

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