Prediction of endurance limit of hardened parts with account of operational factors

Abstract

Fracture endurance limit is one of the main parameters used in calculating the strength of surface hardened parts.  The influence of various operational factors along with hardening should be taken into account in predicting this parameter. Prediction of the endurance limit under stress concentration was carried out according to the criterion that takes into account the influence of residual stresses on the surface of the dangerous section of a hardened part, as well as the criterion of the average integral residual stresses over the thickness of the hardened surface layer equal to the critical depth of a non-propagating fatigue crack. The effect of surface hardening on the endurance limit was analyzed taking into account such operational factors as the type of deformation, working temperature, the asymmetry of the loading cycle of specimens made of steels and aluminum alloys. Fatigue tests of cylindrical specimens with circular notches of a semicircular profile were carried out under torsion, bending and tension-and-compression. It was established that the use of the criterion of the average integral residual stresses is quite a good indicator of the effect of surface hardening on the fracture endurance limit taking into account the operational factors studied.

About the authors

V. F. Pavlov

Samara National Research University

Author for correspondence.
Email: sopromat@ssau.ru

Doctor of Science (Engineering), Professor, Head of the Department of Strength of Materials

Russian Federation

V. A. Kirpichev

Samara National Research University

Email: sopromat@ssau.ru

Doctor of Science (Engineering)
Professor of the Department of Strength of Materials

Russian Federation

P. E. Kiselev

Samara National Research University

Email: dogg199191@mail.ru

Postgraduate Student of the Department of Strength of Materials

Russian Federation

A. A. Shvetsova

Samara National Research University

Email: lcr_063@mail.ru

Postgraduate Student of the Department of Engine Production Technology

Russian Federation

References

  1. Pavlov V.F., Vakuljuk V.S., Chirkov A.V., Sazanov V.P. Prediction of the endurance limit of superficially strengthened details in the conditions of stress concentration. Vestnik UGATU. 2011. V. 15, no. 4 (44). P. 111-115. (In Russ.)
  2. Ivanov S.I., Pavlov V.F. Vliyaniye ostatochnykh napryazheniy na vynoslivost’ nenaklepannogo materiala. V kn.: «Voprosy prikladnoy mekhaniki v aviatsionnoy tekhnike». Vyp. 66. Kuybyshev: Kuybyshev Aviation Institute Publ., 1973. P. 70-75. (In Russ.)
  3. Shkolnik L.M., Devyatkin V.P. Increasing the strength of gears with shot-blasting. Vestnik Mashinostroeniya. 1950. No. 12. P. 13-15. (In Russ.)
  4. Pavlov V.F. On connection between residual stresses and the endurance limit under bending in stresses concentration conditions. Proceedings of Higher Educational Institutions. Machine Building. 1986. No. 8. P. 29-32. (In Russ.)
  5. Ivanov S.I., Shatunov M.P., Pavlov V.F. Vliyaniye ostatochnykh napryazheniy na vynoslivost’ obraztsov s nadrezom. V kn.: «Voprosy prochnosti elementov aviatsionnykh konstruktsiy». Vyp.1. Kuybyshev: Kuibyshev Aviation Institute Publ., 1974. P. 88-95. (In Russ.)
  6. Kirpichyov V.A., Bukatyi A.S., Filatov A.P., Chirkov A.V. Prediction of the endurance limit of superficially strengthened details at various degree of stress concentration. Vestnik UGATU. 2011. V. 15, no. 4 (44). P. 81-85. (In Russ.)
  7. Pavlov V.F., Kirpichev V.A., Vakulyuk V.S. Prognozirovanie soprotivleniya ustalosti poverkhnostno uprochnennykh detaley po ostatochnym napryazheniyam [Prediction of fatigue strength of surface hardened components by residual stresses]. Samara: Samarskiy Nauchnyy Tsentr RAN Publ., 2012. 125 p.
  8. Pavlov V.F., Prokhorov A.A. Correlation of residual stresses and fatigue limit with torsion under conditions of stress concentration Report 1. Substantiation of strength and longevity criteria. Strength of Materials. 1991. V. 23, Iss. 5. P. 536-540. doi: 10.1007/BF00771452

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