SCUFFING FAILURE OF HYDRODYNAMIC BEARINGS
IN THE PRESENCE OF AN ABRASIVE CONTAMINANT

Project: scuffing failure of hydrodynamic bearings
in the presence of an abrasive contaminant
Sponsor:
University: LSU, Mechanical Engineering
Principal Investigator: Dr. Michael Khonsari
Graduate student: Jun Wen
Contact information: Dr. Michael Khonsari

Project Description:

Scuffing failure results from excessive adhesion between rubbing surfaces and gives one or both surfaces a torn, dragged or furrowed appearance, which oftenresults in failure of bearings because of surface mutilation and heating. In the lubricating system there are alwaysa variety of impurities of different materials, shapes and sizes from working environment,contaminated lubricants, corrosionby-products or wear of machine components. When the particle penetrates intobearing liner and locks itself in the bearing linear in apartially or fully embedded position, the contaminant may scratch the surface of slider, anddepending on the lubricant properties, surface properties and operating speed, may drastically raise the local contact temperature leading to surface failure (cf. Dr. Khonsari, 1999). The researchaims at investigating the effect of material properties, operating conditions and contaminant sizes onscuffing failure, thermal behavior and the frictional process. The goal is to develop designs that minimize the failure, improve smoothness of operation, and extend bearing life. Systematic theoretical analyses have been developed, and preliminary simulationsof thedynamic and heat transfer behavior have been or are being carried out by using LS-DYNA.

Figure 1 Simulation Model

 

Movie 1 (File wj_1.gif) Simulation of Scuffing Failure


Movie 2 (File wj_2.gif) Von Mises Stress of Bearing Over-layer


Movie 3 (File wj_3.gif) Surface Interface Force

 

 


 

 

 

 

 

 

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