Hyunseok Oh, Michael H.Azarian, Carlos Morillo, Michael Pecht and Edward Rhemb
Center for Advanced Life Cycle Engineering (CALCE), University of Maryland, College Park, MD 20740, USA
Dell Inc., One Dell Way, Round Rock, TX 78682, USA
This paper identifies the failure mechanisms of ball bearings in low-power motors for electronics cooling. This study contrasts with previous studies on bearing life in its precipitation of failures under lightly loaded, non-accelerated usage conditions that are more representative of electronics cooling applications. Life tests were conducted on bearings composed of steel balls, steel inner and outer races, and a glass-fibre reinforced poly amide cage. Failure analysis of the ball bearings indicated that lubricant loss, transfer film formation, and wear particle generation were the failure mechanisms. Severe wear was found in the glass-fibre reinforced poly amide cages after failure. Several features extracted from the acoustic emission signals were identified as indicators of bearing degradation.
Keywords Rolling element bearings; Grease; Wear; Acoustic emission
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