High-strength pressure vessel steel surface flaw or part-through crack (PTC) specimens were selected for studies of fatigue crack growth rate (da/dN) under constant amplitude cycling to assess the effects of varied stress ratio R (minimum nominal stress/maximum nominal stress, σmin/σmax) and stress level (maximum nominal stress/yield stress, σmax/σys). Analyzed within the framework of linear elastic fracture mechanics, these studies warrant the following conclusions regarding fatigue-crack growth in this material: • Crack growth does not appear to be influenced by stress level, per se, even for stress levels approaching net section yield. • It is moderately influenced by both positive (tension-tension) and negative (tension-compression) stress ratios. • It is principally related to the tensile range of cyclic stress as expressed by the fracture mechanics stress-intensity range parameter, ΔK. Utilizing the results of this investigation, a normalizing relationship expressing da/dN as a function of both ΔK and R, which is applicable to both positive and negative values, is discussed. It is concluded that the stress-intensity range ΔK provides a viable analytical approach to fatigue crack-growth analyses relevant to high-strength pressure vessels.
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Analysis of Fatigue-Crack Growth in a High-Strength Steel—Part I: Stress Level and Stress Ratio Effects at Constant Amplitude
A. M. Sullivan,
A. M. Sullivan
Naval Research Lab., Engineering Materials Div., Strength of Metals Branch, Washington, D.C.
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T. W. Crooker
T. W. Crooker
Naval Research Lab., Engineering Materials Div., Strength of Metals Branch, Washington, D.C.
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A. M. Sullivan
Naval Research Lab., Engineering Materials Div., Strength of Metals Branch, Washington, D.C.
T. W. Crooker
Naval Research Lab., Engineering Materials Div., Strength of Metals Branch, Washington, D.C.
J. Pressure Vessel Technol. May 1976, 98(2): 179-184 (6 pages)
Published Online: May 1, 1976
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Received:
July 30, 1975
Online:
October 25, 2010
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Sullivan, A. M., and Crooker, T. W. (May 1, 1976). "Analysis of Fatigue-Crack Growth in a High-Strength Steel—Part I: Stress Level and Stress Ratio Effects at Constant Amplitude." ASME. J. Pressure Vessel Technol. May 1976; 98(2): 179–184. https://doi.org/10.1115/1.3454357
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