A Method for Increasing the Fatigue Life of Pump Rods

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...

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Bibliographic Details
Published in:Journal of machinery manufacture and reliability 2020-12, Vol.49 (11), p.932-937
Main Authors: Kryukov, A. A., Wildemann, V. E.
Format: Article
Language:English
Subjects:
Axial strain
Axial stress
Elastoplasticity
Engineering
Fatigue life
Machines
Manufacturing
Processes
Reliability
Residual stress
Rods
Strength
Wear Resistance of Machines and Structures
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Summary: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.
ISSN:1052-6188
1934-9394
DOI:10.3103/S1052618820110102