Consistent Creep and Rupture Properties for Creep-Fatigue Evaluation

[+] Author and Article Information
C. C. Schultz

The Babcock and Wilcox Company, Research and Development Division, Alliance, Ohio 44601

J. Pressure Vessel Technol 101(4), 276-285 (Nov 01, 1979) (10 pages) doi:10.1115/1.3454634 History: Received April 10, 1979; Online October 25, 2010


The currently accepted practice of using inconsistent representations of creep and rupture behaviors in the prediction of creep-fatigue life is shown to introduce a factor of safety beyond that specified in current ASME Code design rules for 304 stainless steel Class 1 nuclear components. Accurate predictions of creep-fatigue life for uniaxial tests on a given heat of material are obtained by using creep and rupture properties for that same heat of material. The use of a consistent representation of creep and rupture properties for a minimum strength heat is also shown to provide reasonable predictions. The viability of using consistent properties (either actual or those of a minimum strength heat) to predict creep-fatigue life thus identifies significant design uses for the results of characterization tests and improved creep and rupture correlations.

Copyright © 1979 by ASME
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