Affiliation:
1. Korea Railroad Research Institute
Abstract
The majority of catastrophic wheel failures are caused by surface opening fatigue cracks
either in the wheel tread or wheel flange areas. The inclined cracks at railway wheel tread are initiated
and the cracks are caused by wheel damage-spalling after 60,000 km running. Because the failured
railway wheel is reprofiled before regular wheel reprofiling, the maintenance cost for the railway
wheel is increased. Therefore, it is necessary to analyze the mechanism for introduction of crack. In
the present paper, the combined effect on railway wheels of a periodically varying contact pressure
and an intermittent thermal braking loading is investigated. To analyze damage cause for railway
wheels, the measurements for replica of wheel surface and effect of braking application in field test
are carried out. The result shows that the surface cracks in railway wheel tread are due to combination
of thermal loading and ratcheting.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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