Long-Crack Fatigue Thresholds and Short Crack Simulation at Liquid Helium Temperature
A short crack simulation (SCS) test is used to characterize the near—threshold fatigue crack growth behavior of stainless steels at 4 K. The test methodology holds the maximum stress intensity factor constant while increasing the minimum stress intensity factor, thus raising the stress ratio from 0.1 at the start to about 0.8 at the end of the test. The resulting fatigue crack growth rate measurements are unaffected by crack closure, and the intrinsic threshold is directly obtained without a correction factor. Merits of the test procedure are described.
KeywordsStress Intensity Factor Crack Growth Rate Fatigue Crack Growth Crack Closure Fatigue Crack Propagation
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