Residual stress in wheels

Comparison of neutron diffraction and ultrasonic methods with trends in RCF

P. B. Molyneux-Berry, A. J. Bevan, S. Y. Zhang, S. Kabra

Research output: Contribution to journalArticle

Abstract

The critical damage mechanism on many GB passenger train wheels is rolling contact fatigue (RCF) cracking in the rim. Evidence from field observations suggests that RCF damage occurs much more quickly as the wheelsets near the end of their life. Wheel manufacturing processes induce a compressive hoop stress in the wheel rim; variations in residual stress through the life of a wheel may influence the observed RCF damage rates. This paper describes experiments to measure residual stresses in new and used wheel rims to identify whether this could be a significant factor, and compares the findings from neutron diffraction and ultrasonic birefringence methods. The scope goes beyond previous applications of neutron diffraction to railway wheels and identifies key considerations for future testing. Assuming that the as-manufactured stress distribution was similar for all three wheels tested, it is found that the stresses are redistributed within the wheel rim during its life as material is removed and plastic flow occurs. However, the hoop stress near the running surface remains compressive and may not have a large influence on the RCF damage rates.

Original languageEnglish
JournalCivil-Comp Proceedings
Volume104
Publication statusPublished - 2014

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Neutron diffraction
Residual stresses
Wheels
Ultrasonics
Fatigue of materials
Fatigue damage
Birefringence
Plastic flow
Compressive stress
Stress concentration
Testing

Cite this

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Residual stress in wheels : Comparison of neutron diffraction and ultrasonic methods with trends in RCF. / Molyneux-Berry, P. B.; Bevan, A. J.; Zhang, S. Y.; Kabra, S.

In: Civil-Comp Proceedings, Vol. 104, 2014.

Research output: Contribution to journalArticle

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