The Effect of Contact Angle on Rolling-Contact Fatigue and Bearing Load Capacity

1962 ◽  
Vol 5 (1) ◽  
pp. 210-219 ◽  
Author(s):  
Erwin V. Zaretsky ◽  
William J. Anderson ◽  
Richard J. Parker
Keyword(s):  
Contact Angle ◽  
Load Capacity ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Bearing Load

Coating of Ti64 Bearings in Air by Using a Q-Sw Laser

2012 ◽  
Vol 152-154 ◽  
pp. 1239-1243 ◽  
Author(s):  
Justyna Rozwadowska ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
...  
Keyword(s):  
Load Capacity ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Weight Ratio ◽  
High Strength ◽  
Fold Increase ◽  
Maximum Load ◽  
Rolling Contact ◽  
Wear Loss ◽  
Closed Chamber

The influence of surface oxidizing using a Q-sw laser on the wear loss of titanium-4Al-6V (Ti64) alloy during rolling contact fatigue is investigated. Titanium components are widely appreciated for their superb biocompatibility, high strength to weight ratio and corrosion resistance. Due to the above mentioned advantages titanium bearings are a popular choice in applications requiring high strength, light weight, and minimum maintenance (for example, aerospace and defence industries). In these rolling contact applications however issues such as fretting and wear related problems are a common occurrence as the tribological properties of titanium alloys are inferior to those of other metal alloys, such as steel. In an attempt to tackle this problem, a Q-sw laser was used in this work to coat Ti64 bearings with complex titanium oxide layers in a closed chamber without any protective gas. Non-coated and coated samples were tested under water by using a thrust-type rolling contact fatigue machine. The morphology and crystallographic texture of the layers were observed by laser confocal microscope, scanning electron microscope and X-ray diffraction. The wear loss of the coated samples was at least fifty-fold lower than that of the non-coated bearings and a 3-fold increase in the maximum load capacity compared with TiN layers was achieved.

Comparison between the RCF Performance of TiN- and TiO2-Laser Coated Ti64 Bearings

2012 ◽  
Vol 566 ◽  
pp. 308-312
Author(s):  
Edson Costa Santos ◽  
Justyna Rozwadowska ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Koshiro Mizobe ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Load Capacity ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fold Increase ◽  
Maximum Load ◽  
Rolling Contact ◽  
Closed Chamber ◽  
Body Contact ◽  
Air Atmosphere

The present work is a comparison between the rolling contact fatigue (RCF) of laser processed titanium bearings by using a scanning Nd:YAG Q-sw laser. TiN and TiO2 layers were produced on Ti6Al4V (Ti64) in a closed chamber in nitrogen and air atmosphere, respectively. The average thickness of the layers was 2 m in case of TiN and 0.8 m in case of TiO2. Both non-coated and coated bearings were RCF tested in under-water conditions and it was found that laser processing greatly improved their wear resistance and load capacity. Almost 50-fold and 20-fold increase in the wear resistance of the TiN and TiO2-coated bearings was observed after 7.7x106 cycles at a load of 150 N and 600 rpm. The mechanism responsible for this improvement is thought to be the 3-body-contact between the bearing elements and the small TiN and TiO2 debris, coming from the worn coating layers. The maximum load capability of the non-coated, TiN-coated and TiO2-coated bearings were 150 N, 200 N and 600 N. It is concluded that the higher load capacity of the TiO2 compared to the TiN coatings is due to its lower coefficient of friction.

Evaluation of Tribological Thermal Failure on PEEK-PTFE Hybrid Alumina Ball Bearings

2016 ◽  
Vol 878 ◽  
pp. 142-147 ◽  
Author(s):  
Hitonobu Koike ◽  
Toshihiko Matsumura ◽  
Koshiro Mizobe ◽  
Yuji Kashima ◽  
Katsuyuki Kida
Keyword(s):  
Load Capacity ◽  
Rolling Contact Fatigue ◽  
Composite Layer ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Thermal Failure ◽  
Radial Bearing ◽  
Accumulation Layer ◽  
Peek Composite ◽  
Alumina Ball

In this paper, the thermal failure (seizure or melting) of hybrid radial bearing (PEEK ring-PTFE composite retainer and alumina ball) under rolling contact fatigue test was investigated. For effective operation of equipment in various environments such as dirty, harmful or corrosion situations, the radial PEEK-PTFE hybrid bearings were produced by machining. The PEEK accumulation layer containing carbon graphite was formed on the raceway of bearing's inner ring at 1200-1500 rpm rotation speed. Due to the self-lubrication of the PEEK composite accumulation layer as solid lubricant, the operation temperature in the hybrid bearing was lower than that of all PEEK radial bearing, and the load capacity of the PEEK bearings could be improved. Moreover, it was found that the PEEK composite film which is formed from the PEEK composite layer protected the raceway from the friction heat.

Load Ratings and Fatigue Life Prediction for Ball and Roller Bearings

1970 ◽  
Vol 92 (1) ◽  
pp. 16-20 ◽  
Author(s):  
J. I. McCool
Keyword(s):  
Environmental Variables ◽  
Life Prediction ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Bearing ◽  
Rolling Contact ◽  
Load Rating ◽  
Bearing Load ◽  
Simple Generalization ◽  
Practical Life

A review of current rolling bearing load rating and life prediction practices is given, based on the ASA standard method. Experimental results show the existence of life-factors in addition to those encompassed in the ASA standard. A more general rolling contact fatigue theory is sketched but is not yet at a stage where it can be applied to practical life calculations. Therefore a simple generalization of ASA life formulas is proposed for practical use, which accounts for material and environmental variables by multiplicative factors and permits life prediction for any desired reliability using another, tabulated factor.

Coating of Ti64 Bearings in Air by Using a Q-Sw Laser

2011 ◽  
Vol 418-420 ◽  
pp. 393-397
Author(s):  
Justyna Rozwadowska ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
...  
Keyword(s):  
Load Capacity ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Weight Ratio ◽  
High Strength ◽  
Fold Increase ◽  
Maximum Load ◽  
Rolling Contact ◽  
Wear Loss ◽  
Closed Chamber

The influence of surface oxidizing using a Q-sw laser on the wear loss of titanium-4Al-6V (Ti64) alloy during rolling contact fatigue is investigated. Titanium components are widely appreciated for their superb biocompatibility, high strength to weight ratio and corrosion resistance. Due to the above mentioned advantages titanium bearings are a popular choice in applications requiring high strength, light weight, and minimum maintenance (for example, aerospace and defence industries). In these rolling contact applications however issues such as fretting and wear related problems are a common occurrence as the tribological properties of titanium alloys are inferior to those of other metal alloys, such as steel. In an attempt to tackle this problem, a Q-sw laser was used in this work to coat Ti64 bearings with complex titanium oxide layers in a closed chamber without any protective gas. Non-coated and coated samples were tested under water by using a thrust-type rolling contact fatigue machine. The morphology and crystallographic texture of the layers were observed by laser confocal microscope, scanning electron microscope and X-ray diffraction. The wear loss of the coated samples was at least fifty-fold lower than that of the non-coated bearings and a 3-fold increase in the maximum load capacity compared with TiN layers was achieved.

Rolling-Contact Fatigue Studies With Four Tool Steels and a Crystallized Glass Ceramic

1961 ◽  
Vol 83 (4) ◽  
pp. 603-610 ◽  
Author(s):  
Erwin V. Zaretsky ◽  
William J. Anderson
Keyword(s):  
Fatigue Life ◽  
Glass Ceramic ◽  
Load Capacity ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Fatigue Properties ◽  
Continuous Increase ◽  
Bearing Materials ◽  
Steel Balls

The rolling-contact fatigue properties of crystallized glass ceramic balls together with AISI M-1, AISI M-50, Halmo, and WB-49 alloy steel balls tempered to various hardness levels were determined in the NASA spin rig and in the five-ball fatigue tester. A continuous increase in fatigue life and load capacity for each steel was observed with increased ball hardness. These results correlate with resistance to plastic deformation as measured with spherical specimens in rolling contact but do not correlate with elastic limit and yield strength measured for bar specimens. These bar specimens showed optimum values at intermediate hardness levels. Extremely low scatter in fatigue life for the ceramic balls indicate that the degree of structural homogeneity may be an important factor in life scatter of bearing materials.

Rolling Contact Fatigue of Wheel and Rail

2012 ◽  
Vol 54 (5) ◽  
pp. 304-312
Author(s):  
Florian Dörner ◽  
Otto Kleiner ◽  
Christian Schindler ◽  
Peter Starke ◽  
Dietmar Eifler
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact
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