Influence of Load and Rotation Speed on Life of PPS Radial Bearings under Water Lubricant Conditions

2013 ◽  
Vol 683 ◽  
pp. 439-443 ◽  
Author(s):  
Shunsuke Oyama ◽  
Hitonobu Koike ◽  
Yuji Kashima ◽  
Katsuyuki Kida
Keyword(s):  
Rotation Speed ◽  
Confocal Microscope ◽  
Rolling Contact ◽  
Contact Surfaces ◽  
Laser Confocal Microscope ◽  
Water Lubricant

Influence of load and rotation speed on life of PPS radial bearings under water lubricant condition was investigated. RCF tests were carried out at different loads and rotation speeds until 1.0×106 cycles. After testing, rolling contact surfaces were observed by using a laser confocal microscope. From the observation, it was concluded that the life of PPS radial bearings under water lubricant condition was dominated by cracks and flaking failures. The failure of PPS bearings was caused by the flaking failures. The cracks were observed prior to the flaking failures. The life when flaking failure occur depends on the load and the rotation speed.

Surface Profile Observation of PTFE Radial Bearings under Rolling-Contact-Fatigue in Water

2013 ◽  
Vol 307 ◽  
pp. 337-341 ◽  
Author(s):  
Shunsuke Oyama ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Hitonobu Koike ◽  
Yuji Kashima
Keyword(s):  
Rotation Speed ◽  
Wear Behavior ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Surface Profile ◽  
Rolling Contact ◽  
Shape Measurement ◽  
Shape Effect ◽  
Dimensional Shape ◽  
Laser Confocal Microscope

Groove shape effect on wear behavior in PTFE radial bearings under rolling contact fatigue (RCF) was investigated. RCF tests in water-lubricated conditions were carried out at different loads and rotation speeds. The groove surfaces after testing were observed by using a laser confocal microscope and a two-dimensional shape measurement sensor. It was found that PTFE bearings under RCF generate wear debris, however no cracking or flaking failure could be observed. It is concluded that groove deformation depend on load rather than rotation speed. The biggest changes in groove profiles occurred when tested at loads close to 400N.

The Influence of Surface Texture on Rolling-Contact Fatigue of PEEK Bearings in Water

2010 ◽  
Vol 154-155 ◽  
pp. 1713-1716 ◽  
Author(s):  
Takashi Honda ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Yuji Kashima
Keyword(s):  
Surface Texture ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Surface Profile ◽  
Confocal Microscope ◽  
Rolling Contact ◽  
Initial Surface ◽  
Surface Conditions ◽  
Before And After ◽  
Laser Confocal Microscope

The effect of machining conditions on the rolling contact fatigue (RCF) strength of PEEK polymer bearings was investigated. RCF tests were carried out by using bearings machined by different conditions. The surface profile and roughness were observed before and after testing by laser confocal microscope. Pitting and cracking were associated with the different initial surface conditions. From the obtained results, we found that the RCF strength of machined surfaces decreases when the surface becomes rougher.

Applications of vibro-acoustic measurement and analysis in conjunction with tribological parameters to assess surface fatigue wear developed in the roller-bearing system

2021 ◽  
pp. 135065012098246
Author(s):  
Shashikant Pandey ◽  
Muniyappa Amarnath
Keyword(s):  
Roller Bearing ◽  
Operating Conditions ◽  
Rolling Contact ◽  
Stribeck Curve ◽  
Fatigue Wear ◽  
Surface Fatigue ◽  
Rolling Element ◽  
Measurement And Analysis ◽  
Contact Surfaces ◽  
Bearing System

Rolling-element bearings are the most commonly used components in all rotating machinery. The variations in the operating conditions such as an increase in the number of operating cycles, load, speed, service temperature, and lubricant degradation result in the development of various defects such as pitting, spalling, scuffing, scoring, etc. The defects that appeared on rolling contact surfaces cause surface deterioration and change in the vibration and sound levels of the bearing system. The present experimental investigations are aimed at assessing the surface fatigue wear that appears on the contact surfaces of roller bearings. The studies considered the estimation of specific film thickness, analysis of surface fatigue wear developed on the rolling-element surfaces, surface roughness analysis, grease degradation analysis using Fourier transform infrared radiation, and vibration and sound signal measurement and analysis. The results obtained from the experimental investigation provide a good correlation between surface wear, vibration, and sound signals with a transition in the lubrication regimes in the Stribeck curve.

High-Qe Photodetector for Laser Confocal

1998 ◽  
Vol 4 (S2) ◽  
pp. 418-419
Author(s):  
J. Pawley ◽  
M. Blouke ◽  
J. Janesick
Keyword(s):  
Laser Power ◽  
Materials Science ◽  
Confocal Microscope ◽  
Data Rate ◽  
Research Tool ◽  
Biological Applications ◽  
Fluorescent Marker ◽  
The Past ◽  
Optical Photon ◽  
Laser Confocal Microscope

The laser confocal microscope (LCM) is now an established research tool in biology and materials science. In biological applications, it is usually employed to detect the location of fluorescent marker molecules and, under these conditions, detected signal levels from bright areas often represent <20 photons/pixel (assuming a standard 1.6 μs pixel time) while those from dark areas are likely to average <1 photon/pixel. Although this data rate limits the speed at which information can be derived from the specimen, saturation of the fluorophor, photobleaching of the dye, and phototoxicity often prevent it being increased by simply using more laser power. Over the past 10 years, the optical photon efficiency of commercial confocal instruments has improved significantly and it is now reaching the point where further improvement is becoming very expensive. The only component is which a significant improvement is still possible is the photodetector.

scholarly journals Design of Wheel-Track Rolling Contact Surfaces of Hydraulic Gates

1978 ◽  
Vol 44 (385) ◽  
pp. 3241-3250 ◽  
Author(s):  
Susumu MATSUMOTO ◽  
Hiroshi TERADA ◽  
Hachiro SHIBUYA ◽  
Noriaki SHIGENAGA ◽  
Hiroshi SASAO
Keyword(s):  
Rolling Contact ◽  
Contact Surfaces ◽  
Wheel Track

A Pseudo-Rigid-Body Model for Rolling-Contact Compliant Beams

2007 ◽  
Author(s):  
Allen B. Mackay ◽  
Spencer P. Magleby ◽  
Larry L. Howell
Keyword(s):  
Rigid Body ◽  
Rolling Contact ◽  
Model Parameters ◽  
Displacement Curve ◽  
Cantilever Beams ◽  
Body Model ◽  
Rigid Body Model ◽  
Contact Surfaces ◽  
Definition Of ◽  
Force Displacement

This paper presents a pseudo-rigid-body model (PRBM) for rolling-contact compliant beams (RCCBs). The loading conditions and boundary conditions for the RCCB can be simplified to an equivalent cantilever beam that has the same force-deflection characteristics as the RCCB. Building on the PRBM for cantilever beams, this paper defines a model for the force-deflection relationship for RCCBs. The definition of the RCCB PRBM includes the pseudo-rigid-body model parameters that determine the shape of the beam, the length of the corresponding pseudo-rigid-body links and the stiffness of the equivalent torsional spring. The behavior of the RCCB is parameterized in terms of a single parameter defined as clearance, or the distance between the contact surfaces. RCCBs exhibit a unique force-displacement curve where the force is inversely proportional to the clearance squared.

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