Specific features of corrosion-fatigue fracture of steel and hybrid pump rods

Keywords

sucker rods, crack fatigue growth, steel, composites.

Cite as

Kopei B. V., Krechkovska H. V., Kopei I. B., and Bakun B. N. Specific features of corrosion-fatigue fracture of steel and hybrid pump rods . Physicochemical Mechanics of Materials. 2022. 58(6), 076-081.

Abstract

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

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