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http://dx.doi.org/10.9725/kts.2018.34.4.146

Wear Analysis of Engine Bearings at Constant Shaft Angular Speed during Firing State - Part II: Calculation of the Wear on Journal Bearings  

Chun, Sang Myung (School of Mechanical Engineering, Dept. of Automotive Engineering, Hoseo University)
Publication Information
Tribology and Lubricants / v.34, no.4, 2018 , pp. 146-159 More about this Journal
Abstract
This paper presents a wear analysis procedure for calculating the wear of journal bearings of a four-strokes and four-cylinder engine operating at a constant angular crank shaft speed during firing conditions. To decide whether the lubrication state of a journal bearing is in the possible region of wear scar, we utilize the concept of the centerline average surface roughness to define the most oil film thickness scarring wear (MOFTSW) on two rough surfaces. The wear volume is calculated from the wear depth and wear angle, determined by the magnitude of each film thickness on a set of oil films with thicknesses lower than the MOFTSW at every crank angle. To calculate the wear volume at one contact, the wear range ratio during one cycle is used. The total wear volume is then determined by accumulating the wear volume at every contact. The fractional film defect coefficient, asperity load sharing factor, and modified specific wear rate for the application of the mixed-elasto-hydrodynamic lubrication regime are used. The results of this study show that wear occurs only at the connecting-rod big-end bearing. Thus, simulation results of only the big-end bearing are illustrated and analyzed. It is shown that the wear volume of each wear scar group occurs consecutively as the crank angle changes, resulting in the total accumulated wear volume.
Keywords
firing operating condition; constant angular velocity of a crank shaft; asperity contact; most oil film thickness scarring wear; mixed-elasto-hydrodynamic lubrication; wear volume;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Chun, S. M., Khonsari, M. M., "Wear simulation for the journal bearings operating under aligned shaft and steady load during start-up and coast-down conditions", Tribology International, No. 97, 440-466, http://dx.doi.org/10.1016/j.triboint.2016.01.042, 2016.   DOI
2 Chun, S. M., "Wear analysis of the journal bearings operating under misaligned shaft during motoring start-up and coast-down conditions - Part I: Study on the change in oil film thickness at the potential region involved wear", J. Korean Soc. Tribol. Lubr. Eng., Vol. 33, No. 4, pp. 153-167, 2017.
3 Chun, S. M., "Wear analysis of the journal bearings operating under misaligned shaft during motoring start-up and coast-down conditions - Part II: Wear analysis of two journal bearings supporting for and operating under misaligned shaft", J. Korean Soc. Tribol. Lubr. Eng., Vol. 33, No. 4, 168-186, 2017.
4 Chun, S. M., "Wear analysis of engine bearings at constant shaft angular velocity on a firing state - Part I: Understanding on bearing wear region," Tribol. Lubr., Vol. 34, No. 3, pp. 93-106, 2018.   DOI
5 Booker, J. F., "Dynamically-loaded journal bearings: mobility method of solution", Trans. of the ASME, J. of Basic Engineering, Vol. 87, pp. 537-546, 1965.   DOI
6 Booker, J. F., "Dynamically-loaded journal bearings: numerical application of the mobility method", Trans. of the ASME, J. of Lubrication Technology, Vol. 93, No. 1, pp. 168-176, 1971, Errata: No. 2, April 1971, pp. 315.   DOI
7 Zhao, Y., Maietta, D. M., Chang, L., "An asperity microcontact model incoporating the transition from elastic deformation to fully plastic flow", Trans. ASME, J. Tribol., Vol. 122, pp. 86-93, 2000.   DOI
8 Masjedi, M., Khonsari, M. M., "Film thickness and asperity load formulas for line-contact elastohydrodynamic lubrication with provision for surface roughness", Trans. ASME, J. Tribol., Vol. 134, No. 1, 011503, DOI: 10.1115/1.40005514, 2012.
9 McCool, J. I., "Relating profile instrument measurements to the functional performance of rough surfaces", Trans. ASME, J. Tribol., Vol. 109. No. 2, pp. 264-270, 1987.
10 Kingsbury, E. P., "Some Aspect of the thermal desorption of a boundary lubricant," J. Appl. Phys, Vol. 29, pp. 888-891, 1958.   DOI
11 Rowe, C. N., "Some aspects of heat of adsorption in function of a boundary lubricant", ASLE Trans., Vol. 9, pp. 101-111, 1966.   DOI
12 Holm, R., Electrical contacts, Almqvist & Wiksell, Stockholm, 1946.
13 Archard, J. F., "Contact and rubbing of flat surfaces", J. Appl. Phys., Vol. 24, pp981-988, 1953.   DOI
14 Ligterink, D. J., de Gee, A. W. J., "Measurements of wear in radial journal bearings", Tribotest Journal, Vol. 3, No.1, pp.45-54, 1354-4063, 1996.
15 Kogut, L., Etsion, I., "Elastic-plastic contact analysis of a sphere and a rigid flat", Trans. ASME, J. Applied Mechanics, Vol. 69, pp. 657-662, 2002.   DOI
16 Kogut, L., Etsion, I., "A finite element based elastic-plastic model for the contact of rough surfaces", Tribol. Trans., Vol. 46, pp. 383-390, 2003.   DOI
17 Beheshti, A., Khonsari, M. M., "Asperity micro-contact models as applied to the deformation of rough line contact", Tribol. Int., Vol. 52, pp. 61-74, http://dx.doi.org/10.1016/j.triboint. 2012.02.026, 2012.   DOI
18 Patir, N., Cheng, H. S., "An average flow model for determining effects of three-dimensional roughness on partial hydrodynamic lubrication", ASME J. Lubr. Technol., Vol. 100, pp. 12-17, 1978.   DOI