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.
Fatigue-Crack Growth-Rate Studies of Low-Alloy Pressure-Vessel Steels
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Mowbray, D. F., Andrews, W. R., and Brothers, A. J. (November 1, 1968). "Fatigue-Crack Growth-Rate Studies of Low-Alloy Pressure-Vessel Steels." ASME. J. Eng. Ind. November 1968; 90(4): 648–655. https://doi.org/10.1115/1.3604702
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