The effect of the time of operation, of the surface roughness and of the corrosive environment on the number of cycles to failure in fatigue tests of steel drill pipes of strength groups S-135 and G-105 of various diameters is studied. Tests for high-cycle fatigue by a “bending with torsion” loading scheme imitating the service conditions of drill pipes are performed. It is shown that the fracture resistance of the pipes is reduced in service by 20% due to accumulation of internal defects. The scale factor affects substantially the fatigue endurance of the steels, and this effect decreases with increase in the pipe diameter. Growth of the surface roughness and action of aggressive media lower the cyclic endurance considerably due to formation of stress concentrators on the surface of the pipes.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 34 – 39, February, 2023
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Rublev, S.S., Shvetsov, O.V., Alfimov, A.D. et al. Effect of Operating Factors on Fatigue Fracture of Steel Drill Pipes. Met Sci Heat Treat 65, 94–100 (2023). https://doi.org/10.1007/s11041-023-00897-z
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DOI: https://doi.org/10.1007/s11041-023-00897-z