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

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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.

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Acknowledgments

We would like to thank the UK Science and Technology Facilities Council for the provision of beamtime at the ISIS neutron source. BA and MEF are grateful for funding from the Lloyd’s Register Foundation, a charitable foundation helping to protect life and property by supporting engineering-related education, public engagement and the application of research.

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Authors and Affiliations

  1. Lloyd’s Register, 71 Fenchurch Street, London, EC3 4BS, UK

    Helena Polezhayeva & David Howarth

  2. Lloyd’s Register, Southampton, SO15 2JU, UK

    Manoj Kumar

  3. The Open University, Milton Keynes, MK7 6AA, UK

    Bilal Ahmad & Michael E. Fitzpatrick

  4. Independent Consultant, Chilworth, GU4 8LU, UK

    Helena Polezhayeva

  5. 2H Offshore Engineering Ltd., Woking, Surrey, GU21 6HJ, UK

    Manoj Kumar

  6. Coventry University, Coventry, CV1 5FB, UK

    Michael E. Fitzpatrick

Authors
  1. Helena Polezhayeva
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  2. David Howarth
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  3. Manoj Kumar
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  4. Bilal Ahmad
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  5. Michael E. Fitzpatrick
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Corresponding author

Correspondence to Helena Polezhayeva.

Additional information

Doc. IIW-2530-14, recommended for publication by Commission XIII “Fatigue of Welded Components and Structures”.

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Polezhayeva, H., Howarth, D., Kumar, M. et al. The effect of compressive fatigue loads on fatigue strength of non-load carrying specimens subjected to ultrasonic impact treatment. Weld World 59, 713–721 (2015). https://doi.org/10.1007/s40194-015-0247-y

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  • DOI: https://doi.org/10.1007/s40194-015-0247-y

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