Numerical Simulation and Experimental Research on Thermo-Mechanical-Wear Coupling

This study established a thermo-mechanical-wear (TMW) coupling simulation method to analyze the friction-wear behavior of different aircraft components. A good agreement was obtained between the simulation and experimental results. The method was then applied to a double-row tapered roller bearing (DRTRB) to analyze the complex coupling behavior of its roller-raceway. The ball-disk tribotest shows that the wear coefficient rises with the increase of load and sliding velocity, in which thermal effect plays an important role. As to the friction-wear behavior of roller-raceway, the dimensionless mild wear coefficients under 4 kN and 5 kN are 4.51x10(-9) and 1.06x10(-8), respectively. Further study reveals that the contact stress coupled by thermal effect is obviously larger than the uncoupled and a larger load will result in higher contact pressure and produce more friction heat. As a result, the temperature on the friction interface rises to 100.5 degrees C from 50.5 degrees C when the load changes to 10 kN from 4 kN, and the wear rate increases to 2.45x10(-3) mu m/s from 1.60x10(-4) mu m/s. Moreover, the temperature and wear rate increase with the rise of slip ratio, and the growth rates decrease when the slip ratio reaches 0.3.