Method of Calculating the Fatigue Life of Bearings Taking into Account Wearing of Rolling Elements

The feasibility of using hot-pressed silicon nitride (HPSN) for rolling elements and for races in ball bearings and roller bearings has been explored. HPSN offers opportunities to alleviate many current bearing problems including DN and fatigue life limitations, lubricant and cooling system deficiencies, and extreme environment demands. The history of ceramic bearings and the results of various element tests, bearing tests in rigs, and bearing tests in a turbine engine will be reviewed. The advantages and problems associated with the use of HPSN in rolling element bearings will be discussed.

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Component Hardness Differences and Their Effect on Bearing Fatigue

Journal of Lubrication Technology ◽

10.1115/1.3616889 ◽

1967 ◽

Vol 89 (1) ◽

pp. 47-54 ◽

Cited By ~ 15

Author(s):

E. V. Zaretsky ◽

R. J. Parker ◽

W. J. Anderson

Keyword(s):

Fatigue Life ◽

Residual Stresses ◽

Load Capacity ◽

Full Scale ◽

Contact Temperature ◽

Rolling Element Bearings ◽

Rolling Element ◽

Rolling Elements ◽

Compressive Residual Stresses

The five-ball fatigue tester and full-scale rolling-element bearings were used to determine the effect of component hardness differences of SAE 52100 steel on bearing fatigue and load capacity. Maximum fatigue life and load capacity are achieved when the rolling elements of a bearing are one to two points (Rockwell C) harder than the races. There appears to be an interrelation among compressive residual stresses induced in the races during operation, differences in component hardness, and fatigue life. Differences in contact temperature and plastically deformed profile radii could not account for differences in fatigue life.

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Analysis of a Rolling-Element Idler Gear Bearing Having a Deformable Outer-Race Structure

Journal of Basic Engineering ◽

10.1115/1.3656576 ◽

1963 ◽

Vol 85 (2) ◽

pp. 273-278 ◽

Cited By ~ 24

Author(s):

A. B. Jones ◽

T. A. Harris

Keyword(s):

Fatigue Life ◽

High Speed ◽

Roller Bearing ◽

Rolling Element Bearing ◽

Outer Ring ◽

Outer Race ◽

Rolling Element ◽

Rolling Elements ◽

Planet Gear ◽

Bearing Rings

Conventional calculations of ball and roller bearing carrying capacity and fatigue life assume that the raceway bodies are rigid structures and that all elastic deformation occurs at the rolling elements’ contact with the raceways. In many instances, and particularly with aircraft applications, the bearing rings and their supports cannot be considered rigid. One such application is the planet gear in a transmission. This report develops a theory whereby the effects of the elastic distortions of the outer race of a rolling-element bearing on the internal load distribution and fatigue life of the bearing can be considered. The theory has been programmed for a high-speed, digital computer. An example of calculation for a planet gear roller bearing whose outer race is integral with the gear and of relatively thin section is given. The distortions of the flexible outer ring cause a significantly lower bearing fatigue life (L10) than would occur if the outer ring were rigid and considering a practical range of bearing diametral clearances. Mr. Jones developed the theoretical analysis for this paper and Mr. Harris provided the programming and the experimental data.

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Method for Calculating the Fatigue Life of Bearings Taking into Account Wearing of Rolling Elements

Journal of Friction and Wear ◽

10.3103/s1068366620040029 ◽

2020 ◽

Vol 41 (4) ◽

pp. 359-364

Author(s):

V. B. Balyakin ◽

E. P. Zhilnikov ◽

K. K. Pilla

Keyword(s):

Fatigue Life ◽

Rolling Elements

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Correlation of the Pitting Fatigue Life of Bearings With Rolling Contact Rig Data

Journal of Basic Engineering ◽

10.1115/1.3645916 ◽

1966 ◽

Vol 88 (3) ◽

pp. 583-586 ◽

Cited By ~ 4

Author(s):

JoDean Morrow

Keyword(s):

Fatigue Life ◽

Correlation Equation ◽

Full Scale ◽

Rolling Contact ◽

Rolling Elements ◽

General Method

The general method for correlating the fatigue pitting life of simple rolling elements with the life of bearings is discussed. A “correlation equation” is presented which permits the pitting fatigue life of full scale bearings to be estimated from minimal rolling contact rig data. Three M-50 (MV-1) bearings are analyzed using this equation. In all three cases the life is predicted within a factor of two.

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Simplification of Dynamic Capacity and Fatigue Life Estimations for Oscillating Rolling Bearings

Journal of Tribology ◽

10.1115/1.1576424 ◽

2003 ◽

Vol 125 (4) ◽

pp. 868-870 ◽

Cited By ~ 3

Author(s):

John H. Rumbarger

Keyword(s):

Fatigue Life ◽

Load Rating ◽

Critical Amplitude ◽

Rolling Bearings ◽

Text Book ◽

Dynamic Capacity ◽

Contact Areas ◽

Life Data ◽

Discrete Contact ◽

Rolling Elements

A Dynamic capacity for oscillating rolling bearings was published in 1968 and correlated with available laboratory fatigue life data. That development of the Dynamic Capacity extended the classic fatigue life theory of Lundberg and Palmgren (1947 and 1952) to oscillating rolling bearings. The calculation of the Dynamic Capacity is simplified as a modification of present ABMA and ISO load rating and life standards for continuously rotating rolling bearings. The simplified formulas agree with the Harris, 1991, text book formulation for oscillation amplitudes (greater than the critical amplitude) which cause an overlapping of stressed contact areas by adjacent rolling elements. Oscillation amplitudes less than the critical amplitude result in separate, discrete contact areas on each raceway. Use of the Harris equations will lead to overestimation of the fatigue for oscillation amplitudes which are less than the critical amplitude.

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Cage Slip in Roller Bearings

Journal of Mechanical Engineering Science ◽

10.1243/jmes_jour_1973_015_065_02 ◽

1973 ◽

Vol 15 (5) ◽

pp. 370-378 ◽

Cited By ~ 3

Author(s):

K. T. O'Brien ◽

C. M. Taylor

Keyword(s):

Fatigue Life ◽

Heat Generation ◽

High Speed ◽

Rolling Element Bearings ◽

Design Problems ◽

Adverse Conditions ◽

Roller Bearings ◽

Rolling Element ◽

Low Load ◽

Rolling Elements

The occurrence of cage and roller slip in lubricated roller bearings has been observed under adverse conditions of high speed and low load. Whilst slip is not normally a problem in roller bearings, in certain applications, for example the bearings supporting gas-turbine shafts, it can pose difficult design problems. For such conditions, bearing distress may occur due to increased wear and heat generation. A reduction of slip may be effected by the use of out-of-round races causing a preloading of some of the rolling elements; this, however, entails a corresponding reduction in fatigue life. Work described in this paper supplements the small amount of existing experimental evidence available concerning slip in rolling-element bearings. As well as a consideration of the effects of load and speed on slip, particular attention is paid to the quantity of lubricant supplied and the degree of misalignment present and the influence of these parameters on slip. Experimental results show a considerable divergence from previous results obtained using a similar bearing.

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Fatigue Life Analysis of Rolling Bearings Based on Quasistatic Modeling

Shock and Vibration ◽

10.1155/2015/982350 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 7

Author(s):

Wei Guo ◽

Hongrui Cao ◽

Zhengjia He ◽

Laihao Yang

Keyword(s):

Fatigue Life ◽

Great Influence ◽

Prediction Method ◽

Coupling Model ◽

Accelerated Life Test ◽

Rolling Bearings ◽

Accelerated Life ◽

Bearing Life ◽

Rolling Elements ◽

Fatigue Life Analysis

Rolling bearings are widely used in aeroengine, machine tool spindles, locomotive wheelset, and so forth. Rolling bearings are usually the weakest components that influence the remaining life of the whole machine. In this paper, a fatigue life prediction method is proposed based on quasistatic modeling of rolling bearings. With consideration of radial centrifugal expansion and thermal deformations on the geometric displacement in the bearings, the Jones’ bearing model is updated, which can predict the contact angle, deformation, and load between rolling elements and bearing raceways more accurately. Based on Hertz contact theory and contact mechanics, the contact stress field between rolling elements and raceways is calculated. A coupling model of fatigue life and damage for rolling bearings is given and verified through accelerated life test. Afterwards, the variation of bearing life is investigated under different working conditions, that is, axial load, radial load, and rotational speed. The results suggested that the working condition had a great influence on fatigue life of bearing parts and the order in which the damage appears on bearing parts.

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