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TECHNICAL PAPERS

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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References

Figures

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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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The effect of notch acuity on stress rupture life time for various values of omega

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