Evaluating the fatigue limit of metals having surface compressive residual stress and exhibiting shakedown

Jinta Arakawa, Tatsuya Hanaki, Yoshiichirou Hayashi, Hiroyuki Akebono, Atsushi Sugeta

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The objective of the study described in this article is to evaluate the effect of shakedown of surface compressive residual stresses introduced by shot peening on fatigue limit of stainless steel. First, the tension-compression fatigue tests were conducted on ASTM CA6NM specimens under controlled load and displacement conditions to acquire a fatigue limit diagram under various compressive mean stress. The results showed that shakedown of negative mean stress occurs under controlled displacement. We then carried out in-plane–bending fatigue tests under controlled load conditions on welded ASTM 309 stainless steel specimens with surface compressive residual stress introduced by ultrasonic shot peening. The results provide a fatigue limit of 415 MPa, which agrees with the value of 404 MPa calculated based on a modified Goodman line considering shakedown. Therefore, it is suggested that the surface layer is restricted by the internal bulk that creates controlled displacement conditions and the shakedown of surface compressive residual stress occurs.

Original languageEnglish
Pages (from-to)211-220
Number of pages10
JournalFatigue and Fracture of Engineering Materials and Structures
Volume43
Issue number2
DOIs
Publication statusPublished - Feb 1 2020
Externally publishedYes

Keywords

  • compressive residual stress
  • modified Goodman line
  • shakedown
  • ultrasonic shot peening (USP)

ASJC Scopus subject areas

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

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