The Omega Method–An Engineering Approach to Life Assessment

[+] Author and Article Information
Martin Prager

Welding Research Council, Three Park Avenue, New York, NY 10016-5990

J. Pressure Vessel Technol 122(3), 273-280 (May 17, 2000) (8 pages) doi:10.1115/1.556184 History: Received February 01, 2000; Revised May 17, 2000
Copyright © 2000 by ASME
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Kachanov,  L. H., 1958, IZV, Akad. Nauk., USSR, 8, p. 26.
Sandstrom R., and Kondyr A., 1979, “Model for Tertiary-Creep in Mo- and Cr-Mo Steels,” ICM 3, Vol. 2, Cambridge, UK, Aug. pp. 275–284.
Kawasaki,  T., and Horiguchi,  M., 1979, “Analysis of Accelerated Creep Under Constant Sustaining Load for Austenitic Stainless Steels,” Metall. Trans. A, 10A, pp. 749–757.


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The effect of notch acuity on stress rupture life time for various values of omega
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(a) A strain tolerant material displays a slowly increasing strain-rate in a constant stress test recorded here; omega is low. (b) A strain-intolerant material displays rapidly increasing strain rate in constant stress and constant load tests.
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Reverse creep curve plots strain versus logarithm of remaining life. The linearization of the creep curve confirms omega is constant during life.
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Relative strength of a tube compared to uniaxial specimen as a function of Ω for typical values of n
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Creep crack growth curves for materials of differing creep rates



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