Technical Basis for a Revised Fatigue Crack Growth Rate Reference Curve for Ferritic Steels in Air

[+] Author and Article Information
E. D. Eason

Modeling and Computing Services, Newark, CA 94560

J. D. Gilman

Electric Power Research Institute, Palo Alto, CA 94303

D. P. Jones

Westinghouse Electric Corporation, West Mifflin, PA 15122

S. P. Andrew

Failure Analysis Associates, Palo Alto, CA 94303

J. Pressure Vessel Technol 114(1), 80-86 (Feb 01, 1992) (7 pages) doi:10.1115/1.2929016 History: Received November 21, 1988; Revised June 24, 1991; Online June 17, 2008


Appendix A of the ASME Boiler and Pressure Vessel Code, Section XI, contains a reference curve for fatigue crack growth rates in air in ferritic steels that was established in 1973 with a limited amount of data. In the past 15 years, many additional data have been collected that do not agree with the trend exhibited by this original reference curve. In light of these new data, an analysis has been undertaken to re-evaluate the fatigue crack growth rate curve in the Code. As a result, an improved reference curve that considers the dependence of crack growth rate on R -ratio and ΔK has been developed. This paper presents the technical basis for the improved curve, some details on the analysis used to determine it, and comparison of the current Section XI Code with the available ferritic steel database and the new reference curve. The format proposed for adoption of the new reference curve is presented, with comments on the practical effect of the proposed change.

Copyright © 1992 by The American Society of Mechanical Engineers
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