Sheng Li, Ph.D. (Advisor); Joy Gockel, Ph.D. (Committee Member); Harok Bae, Ph.D. (Committee Member); Ahsan Mian, Ph.D. (Committee Member)
Doctor of Philosophy (PhD)
This study proposes dynamic modeling of lubricated rolling contact and a numerical sub-model for fatigue life prediction of rollers under starved lubrication conditions. Excitation caused by surface defects in rolling disks is numerically calculated and used as a metric in predicting surface pitting failure occurrence. Surface topography of mating surfaces is used as input to the model for determining maximum acceleration, approach velocity, and approach distance of rollers in presence of pits (defects). Resultant bearing force, contacting force versus approach distance are generated and compared for different pit sizes, developing an accurate tool for design purposes. Maximum acceleration and displacement amplitude, bearing force, and contact force are shown to be a direct function of pit size. Further, this study extends on fatigue life prediction of rollers under starved lubrication conditions in which fatigue life is determined by varying tribological conditions: lubrication level, contact pressure, temperature, and surface roughness for different operating conditions.
Department or Program
Ph.D. in Engineering
Year Degree Awarded
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