Fatigue-Crack Growth-Rate Studies of Low-Alloy Pressure-Vessel Steels

[+] Author and Article Information
D. F. Mowbray, W. R. Andrews

Knolls Atomic Power Laboratory, General Electric Company, Schenectady, N. Y.

A. J. Brothers

Materials and Processes Laboratory, Large Steam Turbine-Generator Division, General Electric Company, Schenectady, N. Y.

J. Eng. Ind 90(4), 648-655 (Nov 01, 1968) (8 pages) doi:10.1115/1.3604702 History: Received June 24, 1968; Online August 25, 2011


Fatigue-crack growth rates were determined at room temperature for ASTM A302-Class B and A 508-Class 2 steels in two characteristic plate and forging directions. Tests were performed under zero-to-tension cyclic loading using both through-crack and part-through-crack plate specimens. Crack growth rates in the through-crack specimens, though affected by plate or forging directions, were found to correlate well upon the hypothesis that the crack extension per cycle is proportional to a positive power of the range of alternating stress intensity factor. In addition, the rate of crack extension through the plate thickness of the surface-crack specimens was successfully correlated with data from through-crack specimens.

Copyright © 1968 by ASME
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