Cavitation shotless peening effects on fatigue crack growth behaviour under bending loads

Ali Al-Turaihi, Ali Mehmanparast, Feargal Brennan, Hitoshi Soyama

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Abstract

The effects of partial surface shotless peening on the fatigue crack growth behaviour of a ferritic steel have been experimentally investigated in this paper. Seven fatigue tests were performed on four-point bend specimens fabricated from Optim700QL high-strength steel. Three distinct extents of partial cavitation shotless peening, with respect to the crack tip and specimen symmetry line, were applied on the specimen geometry. Alternating current potential difference (ACPD) was used to measure and monitor the crack depth during fatigue tests. The tests on partially surface peened specimens were conducted under two different load levels. The fatigue crack growth results from these experiments on partially peened specimens have been presented and compared with the results from an additional test on an unpeened specimen. The results show that the residual stress distribution fields formed because of the peening process play a significant role in the fatigue crack shape evolution, crack retardation, and crack propagation behaviour of the material.
Original languageEnglish
Article number88
Number of pages16
JournalMaterial Design & Processing Communications
Volume3
Issue number6
Early online date18 Jun 2019
DOIs
Publication statusPublished - 31 Dec 2021

Keywords

  • ACPD
  • cavitation shotless peening
  • crack shape evolution
  • fatigue
  • high-strength steel
  • residual stress
  • surface defect

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