Service Life Testing of Railroad Bearings with Known Subsurface Inclusions: Detected with Advanced Ultrasonic Technology

2013 ◽  
Vol 2 (3) ◽  
pp. 55-78 ◽  
Author(s):  
C.M. Tarawneh ◽  
J.A. Turner ◽  
L. Koester ◽  
B.M. Wilson
Keyword(s):  
Service Life ◽  
Life Testing ◽  
Ultrasonic Technology ◽  
Railroad Bearings

Virtual Engine Dynamometers in the Service Life Testing of Transmissions

2011 ◽  
Vol 11 (4) ◽  
pp. 48-53
Author(s):  
Norm Newberger ◽  
Dennis J. Paige
Keyword(s):  
Service Life ◽  
Life Testing

Multiple Frequency Ultrasonic Detection of Subsurface Near-Race Inclusions for Improved Fatigue Life Performance

2015 ◽  
Author(s):  
Ping Hu ◽  
Joseph A. Turner ◽  
Constantine Tarawneh ◽  
Brent Wilson ◽  
Allen J. Fuller
Keyword(s):  
Surface Wave ◽  
Service Life ◽  
Contact Fatigue ◽  
Steel Production ◽  
Rolling Contact ◽  
Life Testing ◽  
Damage Initiation ◽  
Steel Cleanliness ◽  
Inclusion Morphology ◽  
The Impact

The importance of steel cleanliness for the performance of tapered roller bearings has been clearly established and has led to on-going improvements in steel production methods. The presence of non-metallic impurities within the steel can result in hard/brittle inclusions that may serve as initiation sites for damage due to sub-surface rolling contact fatigue (RCF) if the inclusions lie within the near-race of the bearing components due to the high mechanical stress present. Current inspection standards define steel cleanliness with respect to bulk inclusion morphology, which limits inspection to a small area that may or may not be representative of the entire steel heat. In this presentation, ultrasonic surface wave methods are described for detecting subsurface inclusions directly on finished bearing inner and outer rings. We expand on our previous work to exploit the different inspection depths that can be achieved with different measurement frequencies. The impact of the different inspection depths is quantified through simulated service life testing with heavy axle loading conditions. For this study, bearing components were first subjected to ultrasonic surface wave testing at three different frequencies to identify near-race inclusions. The simulated service life testing was then used to assess the onset and propagation of RCF failure. RCF spall initiations correlated highly with the positions identified by the ultrasonic inspections suggesting that this approach has a predictive potential. However, additional research is needed to establish the specific criteria needed for such predictions with respect to the inclusion location along the race, the depth from the race surface, the inclusion morphology and the inclusion mechanical properties. This work is anticipated to improve the understanding of RCF damage initiation which will lead a higher level of safety for railroad operations.

scholarly journals Accelerated Life Testing to Predict Service Life and Reliability for an Appliance Door Hinge

2015 ◽  
Vol 1 ◽  
pp. 169-180 ◽  
Author(s):  
Seunghyeon Cheon ◽  
Hyunsoo Jeong ◽  
So Young Hwang ◽  
Seokmoo Hong ◽  
Joseph Domblesky ◽  
...  
Keyword(s):  
Service Life ◽  
Accelerated Life Testing ◽  
Life Testing ◽  
Accelerated Life ◽  
Door Hinge

scholarly journals Modified wood: review of efficacy and service life testing

2015 ◽  
Vol 168 (4) ◽  
pp. 187-203 ◽  
Author(s):  
Graham Ormondroyd ◽  
Morwenna Spear ◽  
Simon Curling
Keyword(s):  
Service Life ◽  
Life Testing ◽  
Modified Wood

Accelerated Service Life Testing of Automotive Vehicles on a Test Course

1992 ◽  
Vol 21 (1) ◽  
pp. 89-108 ◽  
Author(s):  
S. Colin ASHMORE ◽  
Allan G. PIERSOL ◽  
Joseph J. WITTE
Keyword(s):  
Service Life ◽  
Life Testing
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