AN INFLUENCE OF ROLLER STRENGTHENING ON MULTCYCLIC FATIGUE OF SPECIMENS WITH CUTS OF VARIOUS DEPTH AND A PRESSURIZED HUB


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Abstract

The influence of roller strengthening on a residual stresses distribution and multicyclic fatigue of solid cylindrical specimens of 50 mm diameter made of steel 20 with cuts of various depths and a pressurized hub has been examined. As a result, an endurance limit of roller strengthened specimens diminishes. In order to preserve the effect of hardening with a cut’s depth increase, it’s necessary to increase the thickness of a layer with compressive residual stresses. Surface hardening influence on an endurance limit of specimens has been estimated by two criteria: axial residual stresses on a concentrator’s surface and average integral residual stresses, calculated through the dangerous section’s surface layer thickness that equal a critical depth of a non-propagating fatigue crack. It’s been stated that it’s more reasonable to use the average integral residual stresses criterion for an evaluation of roller strengthening influence on an endurance limit of specimens with cuts of various depth and a pressurized hub.

About the authors

Valentin Fyodorovich Pavlov

Samara National Research University

Author for correspondence.
Email: pavlov.vf@ssau.ru

doctor of technical sciences, head of strength of materials department of Samara National Research University (Samara University)

Russian Federation, 34, Moskovskoe shosse, Samara, 443086, Russian Federation

Vyacheslav Petrovich Sazanov

Samara National Research University

Email: sazanow@mail.ru

candidate of technical science, associate professor of strength of materials department of Samara National Research University (Samara University)

Russian Federation, 34, Moskovskoe shosse, Samara, 443086, Russian Federation

Vladimir Stepanovich Vakulyuk

Samara National Research University

Email: vak.v.s@yandex.ru

doctor of technical sciences, professor of strength of materials department of Samara National Research University (Samara University)

Russian Federation, 34, Moskovskoe shosse, Samara, 443086, Russian Federation

Dmitrij Vyacheslavovich Tumanov

Samara National Research University

Email: sopromat@ssau.ru

postgraduate student of strength of materials department of Samara National Research University (Samara University)

Russian Federation, 34, Moskovskoe shosse, Samara, 443086, Russian Federation

Irina Vyacheslavovna Bogdanova

Samara National Research University

Email: sopromat@ssau.ru

postgraduate student of strength of materials department of Samara National Research University (Samara University)

Russian Federation, 34, Moskovskoe shosse, Samara, 443086, Russian Federation

References

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  2. Pavlov, V.F., (1986) O svyazi ostatochnyh napryazhenij i predela vynoslivosti pri izgibe v usloviyah koncentracii napryazhenij [On connection between residual stresses and endurance limit under bending in stresses concentration conditions]. Izvestiya vusov. Маshinostroeniye [Universities News. Mechanical Engineering], no. 8, pp. 29-32. (in Russian).
  3. Pavlov, V.F., Kirpichev, V.A., Vakulyuk, V.S., (2012) Prognozirovanie soprotivleniya ustalosti poverhnostno uprochnyonnyh detalej po ostatochnym napryazheniyam [The prediction of surface hardened parts fatigue resistance by residual stresses]. Samara: Izdatel'stvo SNC RAN [Samara: Samara scientific centre Publishing House of the Russian Academy of Sciences], 125 pp. (in Russian).
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Copyright (c) 2022 Pavlov V.F., Sazanov V.P., Vakulyuk V.S., Tumanov D.V., Bogdanova I.V.

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