THE INFLUENCE OF CUT’S DEPTH ON RESIDUAL STRESSES DISTRIBUTION AND AN ENDURANCE LIMIT OF SPECIMENS UNDER SURFACE HARDENING


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Abstract

The influence of cut’s depth on residual stresses distribution and an endurance limit under bending of hollow cylindrical specimens made of steel 20 with external diameter 50 mm and interior diameter 40 mm after outstripping superficial plastic deforming by roller strengthening of two regimes has been examined. It’s been stated that the value of compressive residual stresses in a dangerous section of specimens decreases on cut’s depth increase. As a result, an endurance limit increment of hardened specimens with cuts diminishes. In order to preserve the effect of hardening by increasing the endurance limit under outstripping superficial plastic deforming with an increase in a cut’s depth, it is necessary to increase the thickness of a smooth part with compressive residual stresses layer. It’s been shown that in order to estimate the increase in the endurance limit of hardened specimens, one should use not residual stresses at the bottom of a cut, but average integral residual stresses through the part’s dangerous section surface layer thickness that equal a critical depth of a non-propagating fatigue crack.

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).

Romania, 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

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

Oleg Mihajlovich Pilipiv

Samara National
Research University

Email: pilipivoleg@mail.ru

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

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

Karina Fyodorovna Matveeva

Samara National
Research University

Email: dakotastr@mail.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

  1. Ivanov, S.I., Pavlov, V.F., (1976) Vliyanie ostatochnyh napryazhenij na ustalostnuyu prochnost’ [Residual stresses influence on fatigue strength]. Problemy prochnosti [Strength problems], no. 5, pp. 25-27. (in Russian).
  2. Ivanov, S.I., (1971) K opredeleniyu ostatochnyh napryazhenij v cilindre metodom kolec i polosok. Ostato-chnye napryazheniya [On determination of residual stresses in cylinder by rings-and-stripes method. Residual stress-es]. Kuibyshev: KuAI [Kuibyshev Aviation Institute], issue 53, pp. 32-42. (in Russian).
  3. Ivanov, S.I., Shatunov, M.P., Pavlov, V.F., (1974) Vliyanie ostatochnyh napryazhenij na vynoslivost' obrazcov s nadrezom [The influence of residual stresses on the endurance of notched specimens]. Voprosy prochnosti elementov aviacionnyh konstrukcij. Kujbyshev: KuAI [Problems of aircraft constructions elements strength. Kuibyshev Aviation Institute], issue 3, pp. 88-95. (in Russian).
  4. Radchenko, V.P., Pavlov, V.F., (2011) Naibol’shaya velichina sjimayutschych ostatochnyh napryazhenij pri poverhnostnom uprochnenii detalej [The maximum of compressive residual stresses under surface hardening of parts]. Trudy MNTK «Prochnost' materialov i elementov konstrukcij». Kiev: IPP im.G.S. Pisarenko NANU [Proceed-ings of the International Scientific Technical Conference “Strength of materials and structural elements”. Kiev: The G.S. Pisarenko Strength Problems Institute of the Ukraine Academy of Sciences], pp. 354-357. (in Russian).
  5. Filatov, E.Ya., Pavlovsky, V.E., (1985) Universal’niy complex mashin dlya ispytaniya materialov i kon-struktzij na ustalost’ [Universal machine complex for fatigue tests of materials and structures]. Kiev: Naukova Dumka [Kiev: Scientific Thought], 92 pp. (in Russian).
  6. 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 Rus-sian Academy of Sciences], 125 pp. (in Russian).
  7. Pavlov, V.F., (1986) O svyazi ostatochnyh napryazhenij i predela vynoslivosti pri izgibe v usloviyah kon-centracii napryazhenij [On connection between residual stresses and endurance limit under bending in stresses con-centration conditions]. Izvestiya vusov. Маshinostroeniye [Universities News. Mechanical Engineering], no. 8, pp. 29-32. (in Russian).

Copyright (c) 2022 Pavlov V.F., Vakulyuk V.S., Sazanov V.P., Pilipiv O.M., Matveeva K.F.

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