The effect of compressive fatigue loads on fatigue strength of non-load carrying specimens subjected to ultrasonic impact treatment

H. Polezhayeva, D. Howarth, M. Kumar, Bilal Ahmed, Michael E. Fitzpatrick

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This paper provides description and results from an investigation aimed to determine whether loading histories specific to marine and offshore structures cause shakedown of compressive residual stress produced by high-frequency mechanical impact (HFMI) treatment and therefore affect fatigue resistance of welded joints improved by these methods. Fatigue tests were carried out to investigate the influence of compressive fatigue loads on fatigue strength of non-load carrying specimens with transverse attachments subjected to ultrasonic impact treatment (UIT). It was found that significant relaxation of compressive residual stresses is achieved under application of compressive cycles in fatigue testing. It was also observed that not only the magnitude of the applied compressive stress/mean stress affects relaxation of the compressive residual stress but also the number of applied compressive cycles. This relaxation may reduce the beneficial effect of HFMI treatment under application of load histories specific to marine structures.
Original languageEnglish
Pages (from-to)713-721
JournalWelding in the World
Volume59
Issue number5
DOIs
Publication statusPublished - 2015

Bibliographical note

The final publication is available at Springer via http://dx.doi.org/10.1007/s40194-015-0247-y .

Keywords

  • fatigue improvement
  • mechanical stress relief
  • peening
  • fatigue strength
  • service conditions

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