Concerning a Creep Surface Derived From a Multiple Integral Representation for 304 Stainless Steel Under Combined Tension and Torsion

[+] Author and Article Information
R. Mark

ITT Grinnell Corporation, Providence, R. I. 02901

W. N. Findley

Division of Engineering, Brown University, Providence, R. I. 02912

J. Appl. Mech 45(4), 773-779 (Dec 01, 1978) (7 pages) doi:10.1115/1.3424417 History: Received October 01, 1977; Revised March 01, 1978; Online July 12, 2010


It is shown that a creep surface, defined in terms of a prescribed creep rate, can be determined from the multiple integral formulation representing the creep data. The creep surface for 304 stainless steel was found to be in good agreement with a Mises ellipse. Observed creep rate vectors for this alloy were found to be normal to a Mises ellipse. These results were obtained from creep tests performed on 304 stainless steel under combined tension and torsion at 593°C (1100°F). Creep strains observed for at least 100 hr were adequately represented by a power function of time, the exponent of which was independent of stress. A third-order multiple integral representation together with a limiting stress below which creep does not occur was employed to describe satisfactorily the constant stress creep data.

Copyright © 1978 by ASME
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