Dependence of the endurance limit on the character of residual stresses distribution in the surface layer of hardened parts
- Authors: Kirpichyov V.A.1, Vakulyuk V.S.1, Bukaty A.S.1, Lunin V.V.2, Mikhalkina S.A.1
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Affiliations:
- Samara State Aerospace University
- Samara State Technical University
- Issue: Vol 13, No 5-1 (2014): Special Issue
- Pages: 180-187
- Section: ISSUE WITHOUT SECTION
- URL: https://journals.ssau.ru/vestnik/article/view/2496
- DOI: https://doi.org/10.18287/1998-6629-2014-0-5-1(47)-180-187
- ID: 2496
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Abstract
The influence of the character of compressive residual stress distribution on the endurance limit of surfacehardened specimens made of various steels and alloys under bending has been examined. Specimens made of ВНС40 and 38Х2МЮА steels with V-shaped notches were hardened by nitriding, foundation specimens made of ВКС-5 alloy – by cementation and ionic cementation, flat specimens made of ЭИ698ВД alloy – by airshot-blasting. The influence of surface hardening on the endurance limit was assessed using two criterions, namely: residual stresses on the dangerous section surface and the average integral residual stresses. It was established that the endurance limit of surface-hardened specimens (parts) is determined not by the value of compressive residual stresses on the surface but by the completeness of the diagram of the residual stress over the part surface layer thickness on condition that the surface layer thickness is equal to the critical depth of the nonpropagating fatigue crack. The average integral residual stress criterion calculated over the thickness of a surface layer of the dangerous section equal to the critical depth of the non-propagating fatigue crack gives a rather accurate estimation of the influence the character of compressive residual stress distribution has on the endurance limit of hardened specimens (parts). In practice the estimation of the increment of surface- hardened specimens (parts) endurance limit by the criterion of residual stresses on the dangerous section surface may lead to a significant error.
About the authors
V. A. Kirpichyov
Samara State Aerospace University
Author for correspondence.
Email: sopromat@ssau.ru
Doctor of Science (Engineering), Professor of the Department of Strength of Materials, Dean of the Aircraft Construction Faculty
Russian FederationV. S. Vakulyuk
Samara State Aerospace University
Email: sopromat@ssau.ru
Candidate of Science (Engineering)
Associate Professor of the Department of Strength of Materials
Russian FederationA. S. Bukaty
Samara State Aerospace University
Email: bukaty@inbox.ru
Candidate of Science (Engineering)
Doctoral Candidate of the Department of Strength of Materials
Russian FederationV. V. Lunin
Samara State Technical University
Email: sopromat@ssau.ru
Postgraduate student of the Applied Mathematics and Informatics Department
Russian FederationS. A. Mikhalkina
Samara State Aerospace University
Email: sopromat@ssau.ru
Senior Lecturer of the Higher Mathematics Department
Russian FederationReferences
- Ivanov S.I., Pavlov V.F. The effect of residual stresses and cold working on fatigue strength // Strength of Materials. 1976. V. 8, no. 5. P. 529-531. doi: 10.1007/BF01528607
- Kpavchenko B.A., Mitryaev K.F. Machining and endurance of high-strength materials. Kuibyshev: Kuibyshev Publishing House, 1968. 131 p.
- Serensen S.V., Borisov S.P., Borodin N.A. Evaluation of fatigue resistance of surface-hardened specimens taking into account residual stress kinetics. // Strength of Materials. 1969. No. 2. P. 3-6. (In Russ.) doi: 10.1007/BF01526828
- Turovsky M.L., Shifrin N.M. Stress concentration in the surface layer of casehardened steel // Vestnik machinostroyeniya. 1970. No. 11. P. 37- 40. (In Russ.)
- Pavlov V.F. Connection between residual stresses and endurance limit under bending in stress concentration conditions // Izvestiya vusov. Маshinostroyeniye. 1986. No. 8. P. 29-32. (In Russ.)
- Pavlov V.F. Kirpichyov V.A., Vakulyuk V.S. Prognozirovanie soprotivleniya ustalosti uprochnennykh detaley po osta-tochnym napryazheniyam [Prediction of fatigue resistance of surfacehardened parts by residual stresses]. Samara: Samarskiy nauchnyy tsentr RAN Publ., 2012. 125 p.
- Pavlov V.F. The influence of the value and distribution of residual stresses in the surface layer of a part with a concentrator on the endurance limit. Report 1. Solid parts // Izvestiya vusov. Маshinostroyeniye. 1988. No. 8. P. 22-26. (In Russ.)
- Pavlov V.F., Vakulyuk V.S., Kirpichyov V.A., Lapin V.I. Residual stresses and limit of endurance of corset specimens after various types of thermal and thermochemical processing // Vestnik of Samara St. Tech. Univ. Technical Sciences Series. 2010. No. 3(28). P. 101-106. (In Russ.)
- Kirpichyov V.A., Bukaty 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. No. 4(44). P. 81-85. (In Russ.)
- Peterson R.Е. Koeffitsienty kontsentratsii napryazheniy [Stress concentration coefficients]. Мoscow: МIR Publ., 1977. 304 p.
- Birger I.A. Ostatochnye napryazheniya [Residual stresses[. Moscow: Маshgiz Publ., 1963. 232 p.
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