scholarly journals A study of the stress field generated by the contact between a sphere and a flat plate for a simplified model of deep-groove ball bearing

2020 ◽  
Vol 40 (2) ◽  
Author(s):  
André Oliveira Köhn ◽  
Fernando Azevedo Silva
Keyword(s):  
Stress Field ◽  
Ball Bearing ◽  
Rolling Contact Fatigue ◽  
High Surface ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Surface Stresses ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Materials Used

Bearings are mechanical elements capable of transferring motion between two or more parts in a machine. When an external load is applied, the rolling elements and their rings tend to initiate a cyclical movement between themselves. Hence, they are linked by a variable type of contact, thus creating high surface stresses. As these elements are subjected to millions of cycles within their lifespan, these cyclical stresses may create cracks and cause failure by rolling contact fatigue (RCF). Due to the importance of this subject, it is vital to study the stress field caused by contact between the rolling parts in a bearing. This paper offers two approaches on the cyclical stresses in a deep-groove ball bearing: an analytical approach, using Hertz’s theory for contact stresses; and a numerical simulation, using the Finite Element Method (FEM) with the software Inventor and Nastran In-CAD. The results of both approaches were compared, and stress behavior was analyzed as the depth of the inner ring was increased. It was concluded that the surface stresses are greatly superior than the strength of the materials used in the bearings, and that the area influenced by these stresses are small when compared to the dimensions of the whole.

Location of an acoustic emission source in a radially loaded deep groove ball-bearing

1998 ◽  
Vol 212 (1) ◽  
pp. 33-45 ◽  
Author(s):  
D Nélias ◽  
T Yoshioka
Keyword(s):  
Acoustic Emission ◽  
Ball Bearing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Bearing ◽  
Rolling Contact ◽  
Fatigue Initiation ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Subsurface Defect

This paper describes a deep groove ball-bearing analysis which has been developed to simulate acoustic emission occurring during ball-bearing operation. The computer simulation is useful to clarify experimental research on rolling contact fatigue initiation using the acoustic emission technique. Results show the ability of the method to detect and to locate a subsurface defect, due to rolling contact fatigue, before the rolling bearing failure occurs. The subsurface defect can be accurately located within the inner ring of a deep groove ball-bearing operating under radial load.

scholarly journals F117-PW-100 Hybrid Ball Bearing Ceramic Technology Insertion

1996 ◽  
Vol 118 (2) ◽  
pp. 434-442 ◽  
Author(s):  
J. R. Miner ◽  
J. Dell ◽  
A. T. Galbato ◽  
M. A. Ragen
Keyword(s):  
Ball Bearing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Performance Testing ◽  
Contact Angles ◽  
Full Scale ◽  
Rolling Contact ◽  
Ceramic Technology ◽  
Liquid Lubricant ◽  
Hybrid Bearing

Results of an Advanced Research Projects Agency (ARPA) sponsored project to demonstrate the operational benefits of incorporating advanced structural ceramic ball elements into the F117-PW-100 aircraft gas turbine engine high rotor thrust bearings is described. This program consists of design, fabrication, and experimental evaluation of candidate hybrid ball bearing designs in Pratt & Whitney and MRC Bearings test facilities. The bearing design criteria and development test conditions utilized for the project are compatible with the requirements of the F117-PW-100 engine system application. Two hybrid bearing designs were produced by analytically varying internal geometry features such as M-50 race curvatures and contact angles to optimize for the modulus of elasticity of the ceramic balls. CERBEC grade NBD 200 silicon nitride ceramic balls (1 1/8 in. size) demonstrated integrity and a quadruple rolling contact fatigue life improvement versus state-of-the-art M-50 steel balls in single ball test rigs. Thermal performance data obtained in full-scale bearing rig performance testing with 178 mm size hybrid and all-steel baseline bearings shows comparable characteristics. The hybrid bearing displayed a distinct survivability benefit in bearing liquid lubricant starvation testing. Two dozen hybrid bearings will be fabricated for full-scale bearing rig endurance tests to be conducted in 1995–1996 as a prerequisite to validation in operating F117-PW-100 engines in 1996–1997.

Material Response to Rolling Contact Loading

1985 ◽  
Vol 107 (3) ◽  
pp. 359-364 ◽  
Author(s):  
A. P. Voskamp
Keyword(s):  
Rolling Contact Fatigue ◽  
Three Dimensional ◽  
Contact Fatigue ◽  
Load Cycle ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Microplastic Deformation ◽  
Contact Loading ◽  
Material Response ◽  
Deep Groove

The material response to rolling contact loading has been analyzed using quantitative X-ray diffraction methods. This has led to the discovery of preferred crystalline orientation in very narrow subsurface regions of endurance-tested 6309 deep groove ball bearing inner rings. The high hydrostatic pressure field, derived from the load-induced three-dimensional stress field in each Hertzian contact load cycle, allows substantial microplastic deformation to be accommodated in the subsurface layers. This microplastic deformation is accompanied by transformation of retained austenite, decay of martensite and the development of texture and residual stresses, one of which is a subsurface tensile stress in a direction normal to the surface. Both the preferred orientation and the tensile residual stress allow for crack propagation parallel to the rolling contact surface. Based on these findings, an outline of a qualitative model for rolling contact fatigue is presented.

Evaluation of Lubricants for High-Temperature Ball Bearing Applications

1968 ◽  
Vol 90 (1) ◽  
pp. 106-112 ◽  
Author(s):  
R. J. Parker ◽  
E. N. Bamberger ◽  
E. V. Zaretsky
Keyword(s):  
Ball Bearing ◽  
Hydrodynamic Lubrication ◽  
Rolling Contact Fatigue ◽  
Percent Level ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Low Oxygen ◽  
Outer Race ◽  
Polyphenyl Ether ◽  
Paraffinic Oil

Several lubricants that are considered candidates for ball bearing applications in the temperature range of 500 to 700 deg F were investigated in full-scale ball bearings and in a rolling-contact fatigue rig. Bearing endurance tests indicate that a synthetic paraffinic oil with an antiwear additive can perform beyond catalog rating at temperatures up to 600 deg F in a low oxygen environment. In a rolling-contact fatigue tester, this synthetic paraffinic oil exhibited at least twice the fatigue life at the 10 percent level of a fluorocarbon and a polyphenyl ether. Based on bearing race groove appearance, elasto-hydrodynamic lubrication was apparent at outer-race temperatures up to 700 deg F.

Fourier Transform Infrared Spectroscopy for Wear Debris Adhesion on PEEK Bearing Surface

2013 ◽  
Vol 307 ◽  
pp. 372-376 ◽  
Author(s):  
Koshiro Mizobe ◽  
Masahiro Takamiya ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Edson Costa Santos ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Wear Debris ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fourier Transform Infrared ◽  
Rolling Contact ◽  
Materials Used ◽  
The Fourier Transform

Polyetheretherketone (PEEK), a tough semi-crystalline thermoplastic polymer with excellent mechanical properties and polytetrafluoroethylene (PTFE), valued for its low friction coefficient are popular materials used for the production of bearings. In this work, rolling contact fatigue (RCF) tests were performed in order to investigate wear on bearing surfaces by using the Fourier Transform Infrared Spectroscopy (FT-IR). It is reported that PEEK’s specific peak at 1243cm-1was shifted and PEEK’s polymer bearing crystalline content level on wear surface remained unchanged by contact stress or wear debris adhesion.

Observation of Wear in PEEK Race - PTFE Retainer Hybrid Polymer Bearings under Dry Contact

2012 ◽  
Vol 457-458 ◽  
pp. 557-562 ◽  
Author(s):  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Katsuyuki Kida ◽  
...  
Keyword(s):  
Wear Track ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Wear Loss ◽  
Hybrid Polymer ◽  
Wear Properties ◽  
Thrust Bearings ◽  
Dry Contact ◽  
Materials Used

In order to establish an optimal combination of materials used for polymer thrust bearings, two types of components (polyetheretherketone (PEEK) races - polytetrafluoroethylene (PTFE) retainer and PEEK races – PEEK retainer) were tested by rolling contact fatigue. Their wear properties were investigated and it was concluded that using a PTFE retainer, the wear loss was improved due to PTFE wear debris attaching to the wear track and acting as a lubricant.

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