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Specific Features of Corrosion-Fatigue Fracture of Steel and Hybrid Pump Rods

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Comparative experimental studies of steel and hybrid sucker rods were carried out for fatigue life under conditions maximum close to natural ones. The regularity of the change in their used service life (during the incubation period until the cracks up to 2 mm long appear in them) due to the applied stresses was established and it was shown that service life increased from 0.25 to 0.85 with the stresses increase from 110 to 175 MPa. In steel sucker rods the part of service life before the crack initiation is smaller and changes in the range of 0.18–0.4 with load increasing from 100 to 150 MPa. As the loads applied to the hybrid rods increased, more and more cracks appeared near the steel heads. The crack growth rates in both steel and composite rods at the stage of their subcritical growth changed in the range of 10–9 –10–8 m cycle .

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Authors and Affiliations

  1. Ministry of Education and Science, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine

    B. V. Kopei, I. B. Kopei & B. M. Bakun

  2. Karpenko Physicomechanical Institute, National Academy of Sciences, Lviv, Ukraine

    H. V. Krechkovska

  3. Ministry of Education and Science, Lviv Polytechnic National University, Lviv, Ukraine

    H. V. Krechkovska

Authors
  1. B. V. Kopei
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  2. H. V. Krechkovska
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  3. I. B. Kopei
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  4. B. M. Bakun
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Corresponding author

Correspondence to H. V. Krechkovska.

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Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 58, No. 6, pp. 76–81, November–December, 2022

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Kopei, B.V., Krechkovska, H.V., Kopei, I.B. et al. Specific Features of Corrosion-Fatigue Fracture of Steel and Hybrid Pump Rods. Mater Sci 58, 768–773 (2023). https://doi.org/10.1007/s11003-023-00728-9

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  • DOI: https://doi.org/10.1007/s11003-023-00728-9

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