Sheng Li, Ph.D. (Advisor); Ahsan Mian, Ph.D. (Committee Member); Joy Gockel, Ph.D. (Committee Member)
Master of Science in Mechanical Engineering (MSME)
This study describes contact fatigue behavior of spur gear contacts operating under mixed elastohydrodynamic condition. The focus is placed on the starvation effect on fatigue crack initiation. With the model, parametric simulations are carried out with different contact parameters. In the process, the lubricant supply is varied to alter the lubrication condition from fully flooded to severely starved circumstance. Multi-axial stress fields induced by surface normal and tangential tractions are evaluated, whose amplitudes and means are used in a multi-axial fatigue criterion to determine the crack initiation life. It is found a lower lubricant viscosity elongates fatigue life when severe starvation occurs, which is opposite to the EHL rule under fully flooded lubrication condition. However, it’s in line with the experimental observation , where film thickness was shown to increase when moving from high viscosity base oil to a lower one under starvation condition.
Department or Program
Department of Mechanical and Materials Engineering
Year Degree Awarded
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