SYMPOSIA PAPER Published: 01 July 1978
STP30053S

Determination of Ductility for Bulk Deformation

Source

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.

Author Information

Woodall, SM
University of Waterloo, Waterloo, Ont., Canada
Schey, JA
University of Waterloo, Waterloo, Ont., Canada
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Details
Developed by Committee: E28
Pages: 191–205
DOI: 10.1520/STP30053S
ISBN-EB: 978-0-8031-4718-8
ISBN-13: 978-0-8031-4480-4