Effect of Cyclic Plastic Pre-Strain on Low Cycle Fatigue Life(<Special Issue>M & M 2009 Conference)

In order to evaluate structural integrity of nuclear components subjected large seismic load which produce locally plastic strain, low cycle fatigue life was examined using cyclic plastic prestrained materials of austenitic steel (SUS316, SUS316L, SUS304TP: JIS) and ferritic steel (SFVQ1A, STS480, STPT410, SFVC2B, SS400: JIS). It was not found that cyclic plastic pre-strain up to range of 16%, 2.5 times affected on low cycle fatigue life. The validity of existing procedure of fatigue life estimation based on usage factor was confirmed when large seismic load brought nuclear materials cyclic plastic strain.