Experimental-numerical study of laser-shock-peening-induced retardation of fatigue crack propagation in Ti-17 titanium alloy

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Residual stresses induced by laser shock peening in Ti-17 titanium specimens were experimentally and numerically investigated to identify the mechanisms and generation conditions of the retardation of fatigue crack propagation (FCP). The retardation was experimentally observed with fatigue life prolonged by 150%. A multi-step simulation strategy for fatigue life prediction is applied, which successfully predicts the experimentally observed FCP behavior. The fractographic observations and numerical simulation indicate that crack closure, as opposed to other microstructural influences, is the dominant effect on retardation. The studies of multi-FCP aspects show that significant retardation occurs in specimens at high values of residual stresses, small peening gap distances, and lower externally applied loads.

Original languageEnglish
Article number106081
JournalInternational Journal of Fatigue
Volume145
Number of pages13
ISSN0142-1123
DOIs
Publication statusPublished - 01.04.2021

    Research areas

  • Fatigue crack propagation, Laser shock peening, Numerical simulation, Residual stress, Stress intensity factor, Ti-17 titanium alloy
  • Engineering

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