Abstract
Effects of phase difference of loading waveform and slit geometry of specimen on high temperature fatigue crack growth of SUS304 stainless steel were examined under multiaxial loading conditions. Fatigue crack growth tests were conducted by using thin-walled cylindrical specimen and DC electrical potential drop method. It was found that crack growth rate under the out-of-phase loading is slower than that under in-phase loading. Slit geometry influences degree of the effects of phase difference on crack initiation, as well as fatigue crack growth. These tendencies result in the characteristics of fatigue life which increases under the out-of phase loading. Concerning to the effects of slit geometry, in case of the slit of low stress concentration, crack initiation life increases and fatigue crack growth rate is decelerated.
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