Effect of cyclic frequency on the fatigue life of ASME SA-106-B piping steel in PWR environments

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Journal of Materials Engineering; (USA)

DOI:https://doi.org/10.1007/BF02834162· OSTI ID:5161434

Terrell, J B ^[1]

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1. Materials Engineering Associates, Inc., Lanham, MD (USA)

The author describes fatigue life tests in pressurized water reactor (PWR) environments performed on smooth and sharply notched specimens of ASME SA-106-B piping steel at cyclic frequencies of 1.0 Hz, 0.1 Hz, and 0.017 Hz. On the basis of these tests, it was concluded that no effect of cyclic frequency existed for smooth specimens whereas a frequency of 0.017 Hz proved to have the most detrimental effect on the cyclic life of the notched specimens. However, a reduction in fatigue strength in the low cycle fatigue regime and a fatigue strength enhancement in the high cycle regime was observed in both 288{sup 0}C (550{sup 0}F) air environment tests and PWR environment tests. This is believed to be due to dynamic strain aging processes. As a result, the current ASME Section III design curve for carbon steels is nonconservative in its positioning, which may decrease the presumed safety factor against fatigue failures in carbon steel piping components having structural discontinuities.

• OSTI ID: 5161434
• Journal Information: Journal of Materials Engineering; (USA), Journal Name: Journal of Materials Engineering; (USA) Vol. 10:3; ISSN JMAEE; ISSN 0931-7058
• Country of Publication: United States
• Language: English

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