Unforeseen, negative interaction-effect of adjacent circumferential notches on the fatigue limit of Ni-based superalloy 718

Saburo Okazaki, Satoshi Okuma, Kevinsanny, Yuhei Ogawa, Hideto Kawashima, Yusuke Funakoshi, Hisao Matsunaga

Research output: Contribution to journalArticlepeer-review

Abstract

Investigations were conducted on the interaction-effects of adjacent, circumferential V-notches on the fatigue limit of Alloy 718, with the aid of fully-reversed, tension–compression fatigue tests. Contrary to expectation, specimen with seven adjacent circumferential notches had lower fatigue limit than that with a single circumferential notch. This phenomenon was attributed to the increased stress intensity factor (SIF) range of shear-mode fatigue cracks at notch-roots, resulting from competition between two factors: (i) stress mitigation through the mechanistic interaction of notches (decreased SIF) and (ii) the orderly, spatial alignment of crack-planes, due to the asymmetric stress-fields in the vicinity of notch-roots (increased SIF).

Original languageEnglish
Article number108015
JournalEngineering Fracture Mechanics
Volume257
DOIs
Publication statusPublished - Nov 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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