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A compliance-based method for correcting fatigue  crack growth data in the presence of residual stresses   
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  • Aditya Khanna,
  • James Vidler,
  • Michael Bermingham,
  • Andrew Sales,
  • Ling Yin,
  • Andrei Kotousov
Aditya Khanna

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James Vidler
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Michael Bermingham
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Andrew Sales
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Andrei Kotousov
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Abstract

Variations of residual stress fields in a fatigue test specimen and/or across specimens influence the plasticity-induced crack closure process as well as the out-of-plane constraint factor. Therefore, these variations can contribute significantly to the scatter of fatigue properties obtained on specimens without stress relief, especially at low stress intensity factor range. To address this problem, a new compliance-based method is developed for correcting fatigue crack growth data in the presence of a residual stress fields of variable magnitude. It is based on the theoretical modelling of the propagation of an edge crack in an elasto-plastic material subjected to cyclic loading of a constant amplitude. The method is demonstrated for compact tension super duplex stainless steel (SDSS) specimens fabricated using wire-arc additive manufacturing (WAAM) and tested without post-fabrication heat treatment. It can be applied for both the evaluation of residual stress fields in fatigue specimens and obtaining the intrinsic fatigue properties of materials.