Development of fatigue life evaluation method using small specimen

Shuhei Nogami, Arata Nishimura, Eichi Wakai, Hiroyasu Tanigawa, Takamoto Itoh, Akira Hasegawa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


For developing the fatigue life evaluation method using small specimen, the effect of specimen size and shape on the fatigue life of the reduced activation ferritic/martensitic steels (F82H-IEA, F82H-BA07 and JLF-1) was investigated by the fatigue test at room temperature in air using round-bar and hourglass specimens with various specimen sizes (test section diameter: 0.85-10 mm). The round-bar specimen showed no specimen size and no specimen shape effects on the fatigue life, whereas the hourglass specimen showed no specimen size effect and obvious specimen shape effect on it. The shorter fatigue life of the hourglass specimen observed under low strain ranges could be attributed to the shorter micro-crack initiation life induced by the stress concentration dependent on the specimen shape. On the basis of this study, the small round-bar specimen was an acceptable candidate for evaluating the fatigue life using small specimen.

Original languageEnglish
Pages (from-to)125-132
Number of pages8
JournalJournal of Nuclear Materials
Issue number1-3
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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