A method for increasing the fatigue life of pump rods and similar elongated cylindrical products is considered. The method consists in creating normal compressing residual stresses in the near-surface region of the product; the stresses are created by sequential elastoplastic deformation: first, by extension, then, when fixed under axial strain, by torsion. It is shown how the residual stresses are generated in the bulk product during its hardening by combined extension and torsion.
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The work was supported by the Russian Foundation for Basic Research, project no. 19-01-00555 A.
The authors declare that they have no conflict of interest.
Translated by E. Oborin
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Kryukov, A.A., Wildemann, V.E. A Method for Increasing the Fatigue Life of Pump Rods. J. Mach. Manuf. Reliab. 49, 932–937 (2020). https://doi.org/10.3103/S1052618820110102
- fatigue life
- pump rods
- residual stresses
- combined extension and torsion
- elastoplastic deformation
- hardening technology
- corrosion–fatigue strength.