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Sunday, July 19, 2020 | History

3 edition of Effect of hoop stress on ball bearing life prediction found in the catalog.

Effect of hoop stress on ball bearing life prediction

Erwin V. Zaretsky

Effect of hoop stress on ball bearing life prediction

by Erwin V. Zaretsky

  • 376 Want to read
  • 1 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Ball bearings.,
  • Finite element method.,
  • Life (Durability),
  • Stress analysis.

  • Edition Notes

    StatementErwin V. Zaretsky, Richard August, Harold H. Coe.
    SeriesNASA technical memorandum -- 106874.
    ContributionsAugust, R., Coe, Harold H., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15413464M

    For bolted joints without a preload shear, stress is calculated like bearing stress: force over area. Like bearing stress, it is also an average stress and the maximum shear will be higher. This effect makes the stress-life exponent much greater than would otherwise be expected. To illustrate the effect of residual stress without hoop stress from an interference fit on a radially- loaded roller bearing, we compare the effect of substituting case carburized .

    Nathan A. Branch,1 Nagaraj K. Arakere,1 Vaughn Svendsen,2 and Nelson H. Forster2 Stress Field Evolution in a Ball Bearing Raceway Fatigue Spall ABSTRACT: The governing mechanisms of fatigue spall propagation in ball bearing inner raceways are investigated through the use of elastic-plastic finite element modeling, X-ray diffraction, and the visual.   Gearbox Bearing System Higher load Improving Bearing Life and Performance with Computational Testing Novem #4 #3 #2 #1 Premature failure: including hoop stress Hoop stress effect Nominal load Exp. Data (Harris & Barnsby) Jalalahmadi-Sadeghi Lundberg-Palmgren Theory Raje-Sadeghi S-N data for cylindrical roller bearing (CRB).

    CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The press fitting of rolling bearings, the centrifugal expansion of the spindle and inner ring, and the thermal expansion of rolling bearing assembly elements modify the ball and races clearance, creating the hoop-stress. Consequently, the rolling elements and races contact loads and contact angles change. stress-life exponent tz can significantly affect bearing life predictions. For roller bearings, a percent variation in Hertz stress can result in a nearly two-to-one difference in life prediction depending on whether an exponent of 6 or 10 was selected in the calculations. Conversely, if a load-life.


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Effect of hoop stress on ball bearing life prediction by Erwin V. Zaretsky Download PDF EPUB FB2

Ram-bore, angular-contact ball bearing. The predicted fives with and without hoop stress were compared with experimental endurance results obtained at 12 and 25 rpm with the mm-bore ball bearing.

A life factor equation based on hoop stress is presented. a a2 a3 b ob oi Do op e g k Lb Li SYMBOLS semimajor radius of contact. A life analysis was performed on both a 45 and a mm-bore, angular-contact ball bearing. The predicted lives with and without hoop stress were compared with experimental endurance results obtained at 12, rpm with the mm-bore ball bearing.

A life factor equation based on hoop stress is by: 1. Get this from a library. Effect of hoop stress on ball bearing life prediction. [Erwin V Zaretsky; R August; Harold H Coe; United States. National Aeronautics and Space Administration.].

A life analysis was performed on both a and a mm-bore, angular-contact ball bearing. The predicted lives with and without hoop stress were compared with experimental endurance results obtained at and rpm with the mm-bore ball bearing. A life factor equation based on hoop stress is : Erwin V.

Zaretsky, Richard August, Harold H. Coe. A life analysis was performed on both a and a mm-bore, angular-contact ball bearing. The predicted lives with and without hoop stress were compared with experimental endurance results obtained at and rpm with the mm-bore ball bearing.

A life factor equation based on hoop stress is presented. stress field in rolling-element bearing fatigue life prediction, concluding that instantaneous values of the investigated the effect of hoop stress due to interference fits on the lives of roller and ball bearings, showing that these hoop stresses can reduce bearing lives by as much as b) () V))) V.

Effect of Hoop Stress on Ball Bearing Life Prediction©: A life analysis was performed on both a 45 and a mm-bore, angular-contact ball bearing. The predicted lives with and without hoop stress were compared with experimental endurance results obtained at 12, rpm with the mm-bore ball.

Get price. The predicted lives with and without hoop stress were compared with experimental endurance results obtained at and rpm with the mm-bore ball bearing. A life factor equation based. The Effect of Hoop and Material Residual Stresses on the Fatigue Life of High Speed, Rolling Bearings.

Tedric A. Harris et al. Tribology Transactions. Vol - Issue 1. Published online: 25 Mar Article. Effect of Hoop Stress on Ball Bearing Life Prediction©. Zaretsky's research works with 1, citations reads, including: New Stress Based Fatigue Life Models for Ball and Roller Bearings.

Ball/v-ring rig fatigue endurance testing is a currently used method to screen ball materials and processing methods, particularly for aircraft applications. As a first step toward predicting ball fatigue life in bearings, the Lundberg-Palmgren and Ioannides-Harris life prediction methods were applied to ball/v-ring test data.

At MPa Hoop stress, in rings A29, B30 and B33 WECs are found at a depth of about 70 μm from rolling surface. In ring B28, WECs are found at a depth of μm. B28 takes the highest number of cycles to fail at MPa Hoop stress ( million) compared to, and 7 million cycles for the other rings.

Full text of "NASA Technical Reports Server (NTRS) Relation between Hertz Stress-Life Exponent, Ball-Race Conformity, and Ball Bearing Life" See other formats Relation between Hertz Stress-Life Exponent, Ball-Race Conformity, and Ball Bearing Life Erwin V. Zaretsky, Fellow STLE National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio.

Because of this life dispersion, bearing life is typically expressed by Life, define d as the number of cycles at which 90% of the bearings survive under a rated load and speed The volume of RCF affected material V is estimated to be V (3 1) where a is the semi major axis of the contact ellipse, is the depth where orthogonal shear stress is.

Fig. 3 illustrates the effects of the inner raceway surface roughness on motions of the ball and skidding between the ball and inner/outer raceway under the axial load of 50 N.

As seen in Fig. 3(a) and (b), when the inner raceway surface roughness is smaller than µm, the effect of surface roughness is very limited; however, when the inner raceway surface roughness is larger than µm. Ball Bearing Life 25 Bearing Retention 26 Spur Gear Bearings 31 Helical Gear Bearings 34 convex surface to the balls raising the stress.

As previously described, the raised surface on each side of the pathway is from the balls on the inside and hoop stresses from press fit assembly on the outside.

The raceway’s fatigue life based on ISO bearing life theory is studied. Results show that the friction force on the contact surface has some influence on the stress and fatigue life to a certain extent.

Especially, the ball’s spin has the greatest influence on the stress distribution and fatigue life. Finally, the system stress distribution of linear guideways will be obtained by using the superposition method, and the bearing life theory proposed by Lundberg and Palmgren is adopted to describe the contact fatigue life.

The fatigue life prediction results reveal that the effect of number of stress circle of LGT recirculating rollers to. This method, which is still based on the LP formulation, employs a single stress-life factor to modify the LP predicted fatigue life.

In the fatigue life prediction for a bearing application, the stress-life factor integrates the effect on life of all applied, induced and material residual stresses together with empirically determined fatigue.

These stress levels for three types of bearings are: MPa (, psi) for self-aligning ball bearings - MPa (, psi) for all other ball bearings - MPa (, psi) for all roller bearings; Bearing Rating Life Calculation “Rating life” is the bearing life calculated for 90% reliability.

Model predictions are in agreement with available experimental life data obtained with a mm angular contact ball bearing with MNiL races and silicon nitride balls. The stress modification approach is also applied to model the role of any fatigue limiting shear stress, such that the solutions converge to validated Lundberg–Palmgren.BEARINGS Identitging and correcting causes of bearing faihue.

Precision ball bearings are designed to have a long and useful Ii€e. Assuming the application is correct to begin with, maximizing longevity means bearings must be properly installed, lubricated and maintained.

Poor operating environments. oarticularlv moist or contaminated areas.The new methodology for the fatigue life prediction of the rolling bearing is proposed and verified in the paper. The proposed method is based on the application of the multiaxial high-cycle fatigue criterion and the analytical solutions for elliptical and line contact for the estimation of the equivalent fatigue stress in the rolling bearing.