Friction-Creep and Wear Studies for Steel Wheel and Rail.

摘要

Some basic aspects of the friction-creep phenomena in the rolling of a steel wheel on a rail are studied with a qualitative analysis of stress,strain,adhesion and creep in the contact zone and the stresses on the remaining surface of the rail and the wheel. Some pertinent literature on the subject is briefly discussed. A friction-creep test facility was modified and improved to give more accurate friction-creep data. The electrical control and drive system was changed to give accurate speed of rotation and to dynamically brake the two wheels separately. Friction-creep data was taken with braking of both the small and the large wheels. The data obtained with small wheel braking showed higher coefficients of friction than that of the large wheel braking. Some preliminary reasons for the difference are qualitatively discussed. A preliminary study of the nature and progress of wear during rolling was done with two microscopes,installed for each wheel. With the help of a microswitch and flash gun,some qualitative observations were made on one spot on the wheel. Attempts are being made to study the nature and rate of wear quantitatively.