FATIGUE CRACK GROWTH CHARACTERISTICS OF NUCLEAR PRESSURE VESSEL GRADE MATERIALS. Paper No. 1. Page: 4 of 11
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AK = K - K = Ymax. - Pmin.
max. min. BW BW
where "a" is the crack length measured from the centerline of loading, Y is a
compliance constant which depends upon a/W, W is the specimen width (see Figure 1),
B is the specimen thickness, Pmax. and Pmin. Ore the maximum and minimum load per
cycle. The results are presented in Figures 2, 3, 4 and 5. Figures 2 and 3
present the 550*F fatigue crack growth rate versus stress intensity factor range
relationship for specimens fabricated from the base metal (HSST Plate 02).
Figure 2 represents data generated in PWR water chemistry and Figure 3 data
generated in BWR environment. The upper scatterband from similar data generated
by Clark with A533, Grade B, Class 1 base plate is also shown in Figures and
3. The fatigue crack growth rate versus stress intensity factor range relationship
for specimens fabricated from the weldment materials are shown in Figures 4 and 5.
Figures 4 through 5 show that there is not an effect of water chemistry (PWR and BWR)
on the fatigue crack growth rate of the materials investigated (base, weld metal
and HAZ metal) for specimens fatigue at 600 cycles per minute. However, for tests
performed at 60 cycl's per minute in BWR water chemistry, the data fall outside
Clark's scatterband at the low AK values. This anomalous behavior is probably
related to the threshold level which is outside the realm of this experiment.
To date, the presence of nuclear reactor grade water environment (chemistry and
pressure) for PWR and BWR was found not to have an effect on the fatigue crack
growth of A533, Grade B, Class 1 steel base plate and weldments. Comparison
of the results obtained for each material tested at 550 F and 600 cycles per
minute indicated that the upper scatterband of the crack growth rate data for
the base plate material at 75*F encompass all other data.
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Mager, T.R. FATIGUE CRACK GROWTH CHARACTERISTICS OF NUCLEAR PRESSURE VESSEL GRADE MATERIALS. Paper No. 1., report, January 1, 1971; Country unknown/Code not available. (https://digital.library.unt.edu/ark:/67531/metadc1034097/m1/4/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.