Effect of Temperature on Mechanical Properties and Torsional Friction Behaviors of Bogie Center Plate

Abstract

In order to simulating the torsional friction of the center plate during the railcar body traveling on different railway curves at different environmental temperatures, the torsional friction behavior of monomer casting (MC) nylon composites which was used to make center plate, at temperatures of −25 °C to 50 °C was studied. With increasing temperature, the mechanical properties of nylon composites were weakened, whereas the visco-elastic property was boosted. Under torsional angle of 1.8 deg and 0.96 deg, all the torque–angular displacement (T–θ) curves exhibited the quasi-parallelogramic shape at various temperatures. When the temperature was higher than 25 °C under 0.42 deg, the shape transformed from elliptic to parallelogrammic. This indicated that the torsional regime changed from a partial slip to a gross slip. With increasing temperature, the torsional torque decreased and the wear mass loss increased because of weakened mechanical properties. The wear mechanism changed from slight plastic flow at low temperature to serious adhesive and three-body abrasion wear at high temperature.