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Results of High Stress Ratio and Low Stress Intensity on Fatigue Crack Growth Rates for 304 Stainless Steel in 288°C Water

[+] Author Affiliations
William M. E. Evans, G. L. Wire

Bechtel Bettis, Inc., West Mifflin, PA

Paper No. PVP2002-1226, pp. 91-98; 8 pages
doi:10.1115/PVP2002-1226
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Pressure Vessel and Piping Codes and Standards
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4650-4
  • Copyright © 2002 by ASME

abstract

Fatigue crack growth rate tests were performed on a 304 stainless steel compact tension (CT) specimen in water with 40–60 cc/kg H2 . Data in the literature for CT tests show minor environmental effects in hydrogenated water, but higher effects in oxygenated water. However, the PWR data presented by Bernard, et al (1979) were taken at low stress ratios (R = 0.05) and high stress intensity levels (ΔK = 16–41 MPa√m). The purpose of these tests is to explore the crack growth rate characteristics of 304 SS in hydrogenated water at higher R values (0.7 and 0.83) and lower ΔK values (11.0 and 7.7 MPa√m) Each set of R, ΔK conditions were tested at frequencies of 0.1, 0.01 and 0.001 Hz. The results show a pronounced effect on crack growth rates when compared to available literature data on air rates.

Copyright © 2002 by ASME

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