1701 中高温での低サイクル疲労寿命に及ぼす繰返し予ひずみの影響(OS17-1 低サイクル疲労とその応用-予ひずみ、変動荷重の影響-)

概要

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This study examined the effect of cyclic plastic pre-strain on low cycle fatigue life at middle high temperature to evaluate the structural integrity of the nuclear components introduced plastic strain to the local portion by the large seismic load. The materials selected in this study were austenitic steel (SUS316NG) and ferritic steel (SFVQ1A, STS410: JIS^*). The low cycle fatigue tests at RT and middle high temperature (300 degrees C) were carried out using cyclic plastic pre-strained materials. The results obtained here show that the damage by the cyclic plastic pre-strain, which is equivalent to usage factor UF=0.2, does not affect the fatigue lives of the materials. In addition, it is confinned that the estimation based on the usage factor UF can also be useful for the life prediction at 300 degrees C as well as RT. [^*JIS: Japanese Industrial Standards]
一般社団法人日本機械学会の論文
2010-10-09