Effects of Third Invariant of Deviatoric Stress Tensor on Transient Creep of Thick-Walled Tubes

[+] Author and Article Information
S. Murakami

Dept. of Mechanical Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan

Y. Yamada

Mitsui Shipbuilding and Engineering Co., Tamano, Okayama, Japan

J. Eng. Mater. Technol 96(3), 207-213 (Jul 01, 1974) (7 pages) doi:10.1115/1.3443212 History: Received May 24, 1973; Revised February 11, 1974; Online August 17, 2010


Creep theories with the effect of the third invariant of the deviatoric stress tensor and their accuracy as applied to practical problems are discussed. Constitutive equations for transient creep are first formulated by assuming creep potentials of the Prager-Drucker and the Bailey-Davis type together with the associated equivalent stress functions. Strain-hardening and time-hardening hypotheses are assumed. Experimental results hitherto reported for thin-walled tubes are discussed according to these equations. Then, the creep of a thick-walled tube of mild steel is analyzed and compared with experiments.

Copyright © 1974 by ASME
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