Biaxial Strength of HY 80 Steel

[+] Author and Article Information
K. S. Chan, U. S. Lindholm

Department of Materials Sciences, Southwest Research Institute, San Antonio, Texas 78284

J. Wise

David Taylor Naval Ship R&D Center, Norfolk Naval Shipyard, Portsmouth, Va. 23709

J. Eng. Mater. Technol 107(2), 132-137 (Apr 01, 1985) (6 pages) doi:10.1115/1.3225788 History: Received June 11, 1984; Online September 23, 2009


The biaxial deformation behavior of HY 80 steel has been examined by testing thin wall tubes under combined axial tension and internal pressure. The effective stress-strain curves and the hardening response have been found to vary with the stress state. The plastic strain ratio at a given stress ratio deviates from the von Mises value except at the stress states near uniaxial tension, plane strain and equi-biaxial tension. Using Drucker theory, these deviations are eliminated and the resulting yield locus is in good agreement with both the Bishop-Hill theory and the experimental results. Influenced by the tube geometry, the instability strains at the onset of diffuse necking are decreased by an increase in hoop tension. The diffuse necking strains are reasonably predicted by the Swift and the Lankford-Saibel/Mellor criteria.

Copyright © 1985 by ASME
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