Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Friction-Creep and Wear Studies for Steel & Wheel Rail

Author(s): Karamchandani, K. C., S. Kumar, C. A. Sciammarella, B. Seth, L. Nailescu & S. Kalpakjian
Corporate Author: Illinois Institute of Technology, Department of Mechanics and Mechanical and Aerospace Engineering
Corporate Report Number: IIT-TRANS-75-1
Date of Publication: 1975-05
Pages: 103
Contract: DOT-OS-40103

Abstract:
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. The friction-creep test facility, developed by the GM-EMD and given to IIT for the project, 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. The maximum coefficient of friction for virgin steel on virgin steel was between 0.55 and 0.7 and creep up to 1.2% was observed. The friction creep data taken with water and oil contamination yielded maximum friction coefficient of 0.25, maximum creep of 3.4%, for water, and 0.06 and 22% respectively for oil. Non-dimensionalized tractive force and creep is plotted which can be used for similitude purposes. A preliminary study of the natur 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.

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