The WDPRC (Wheel Defect Prevention Research Consortium) conducted analyses of WILD (wheel impact load detector) data to explore how wheelset position and operating environment affect RCF (rolling contact fatigue). The typical three-piece freight car truck used in North America produces higher tangential wheel/rail contact forces on the wheelset in the lead position than on the wheelset in the trail position of a truck as a car negotiates a curve. An analysis of WILD data shows that these higher forces are contributing to more shelling damage on wheelsets that are consistently in the lead position of a truck. Another analysis of WILD data from five trainsets of nearly identical cars shows that any differences in wheel tread damage due to component differences are insignificant in comparison to the differences in wheel tread damage associated with environmental factors. While this analysis does not address component specification differences that could potentially have a large influence on shelling, it does show that environmental factors can play a large role in wheel tread damage. Car routing and loading characteristics were investigated as possible wheel damage factors. It appears that cars running on routes through terrain with longer, steeper grades may be prone to increased wheel shelling, probably due to thermal mechanical shelling. Side-to-side imbalanced loading appears to play a minor role in wheel shelling for two of the five trainsets.
The effects of wheelset position and operating environment on rolling contact fatigue
2009
8 Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
RTDF2008-74014 The Effects of Wheelset Position and Operating Environment on Rolling Contact Fatigue
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