ABOUT CALCULATION AND EXPERIMENTAL ESTIMATION OF  WORKING CAPACITY OF BALL JOINTS OF A VEHICLE CHASSIS. PART 2. CALCULATION BY WEAR RESISTANCE CRITERION AND EXPERIMENTAL DETERMINATION OF CHARACTERISTICS OF WEAR-FATIGUE DAMAGE

BOGDANOVICH Alexander V., D. Sc. in Eng., Assoc. Prof., Professor of the Department of Theoretical and Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The ball joints of vehicles are referred to the steering and suspension critical units. Strength calculation of the ball pin under static loading is usually performed in the practice of designing these units. In the article, the ball joint is considered as a tribo-fatigue system in which the zones that are dangerous in terms of bending stresses and wear are separated from each other, but are caused by the same load. The necessity of estimating the fatigue resistance of the  ball pin and taking into account the uneven distribution of wear over the mating surfaces of the ball head and the liner is shown. The work is done in 2 parts. In the first part, the evaluation of the static and fatigue strength of the  ball pin is discussed, and in the second, the assessment of the wear resistance of the joint elements and the  proposal for a new method for testing the joint model are considered.

ball joint, strength, wear resistance, friction, contact pressure, wear rate, tribo-fatigue system, wear-and-fatigue tests

1. Bogdanovich А.V. O raschetno-eksperimentalnoy otsenke rabotosposobnosti sharovykh sharnirov shassi transportnogo sredstva. Chast 1. Raschet po kriteriyu prochnosti [About calculation and experimental estimation of working capacity of ball joints of a vehicle chassis. Part 1. Calculation by strength criterion]. Mekhanika mashin, mekhanizmov i materialov [Mechanics of machines, mechanisms and materials], 2019, no 1, pp. 77–81.
2. Reshetov D.N., Gusenkov A.P., Drozdov Yu.N., et al. Mashinostroenie. Entsiklopediya. T. 4-1. Detali mashin. Konstruktsionnaya prochnost. Trenie, iznos, smazka [Mechanical engineering. Encyclopedia. Volume 4-1. Machines parts. Structural strength. Friction, wear, lubricant]. Moscow, Mashinostroenie Publ., 1995. 864 p.
3. Kragelskiy I.V. Trenie i iznos [Friction and wear]. Moscow, Mashinostroenie Publ., 1968. 480 p.
4. Kuzmenko A.G., Sitnik S.V. Raschet i povyshenie iznosostoykosti sharovykh sharnirov rulevogo upravleniya transportnykh mashin [Calculation and improvement of wear resistance of ball joints of steering of transport vehicles]. Problemy tribologii [Tribology problems], 2012, no. 2, pp. 75–81.
5. Mikhaylov A.N., Golubov A.N. Raschet otnositelnykh peremeshcheniy v sisteme vtulka-palets sharovoy opory [Calculation of the relative displacements in the sleeve–ball bearing pin system]. Progressivnye tekhnologii i sistemy mashinostroeniya [Advanced technologies and systems of mechanical engineering], 2016, no. 5(55), pp. 10–17.
6. Bakhvalov S.V., Babushkin L.I., Ivanitskaya V.P. Analiticheskaya geometriya [Analytic geometry]. Moscow, Prosveshchenie Publ., 1970. 376 p.
7. Korn G., Korn T. Mathematical Handbook for Scientists and Engineers. New York, San Francisco, Toronto, London, Sydney, McGraw&Hill Book Company, 1968. 1130 p.
8. Kogaev V.P., Drozdov Yu.N. Prochnost i iznosostoykost detaley mashin [Strength and wear resistance of machine parts]. Moscow, Vysshaya shkola Publ., 1991. 319 p.
9. Novikov A.N., Stratulat M.P., Sevastyanov A.L. Vosstanovlenie i uprochnenie detaley avtomobiley [Restoration and hardening of car parts]. Orel, FGBOUVPO “Gosudarstvennyy universitet – uchebno-nauchno-proizvodstvennyy kompleks” Publ., 2006. 332 p.
10. Reimpel J. Fahrwerktechnik: Lenkung. Würzburg, Vogel-Buchverlag Würzburg, 1984. 296 p.
11. Standard of Belarus 1758-2007. Tribofatika. Metod sovmeshchennykh ispytaniy na izgibnuyu i kontaktnuyu ustalost materialov zubchatykh koles [Tribo-Fatigue. Method of combined tests for bending and contact fatigue of gear wheel materials]. Minsk, Gosstandart Publ., 2007. 45 p.
12. Makhutov N.A., et al. Metod sovmeshchennykh ustalostnykh ispytaniy modeley zubchatykh zatsepleniy [Method of combined fatigue testing of gearing models]. Zavodskaya laboratoriya. Diagnostika materialov [Factory laboratory. Diagnostics of materials], 2005, vol. 71, no. 1, pp. 55–57.
13. Zhmaylik V.A., et al. Sposob ispytaniya materiala zubchatogo kolesa na kontaktnuyu i izgibnuyu ustalost [Method of testing the gear material for contact and bending fatigue]. Patent RB, no. а20040781, 2007.