United States Department of Transportation
i
Evaluation of service-induced residual stresses in railroad commuter car wheels
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1999-11-01
[PDF-420.43 KB]
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Abstract:Analyses of the effects of service conditions on the distribution of
residual stresses in railroad commuter car wheels are presented. Novel
software has been applied to estimate the effects of service conditions
on the as-manufactured state of these wheels. Contact loads resulting
from wheel and rail interaction and thermal loads from on-tread
braking are considered. Results indicate that contact stresses acting
alone result in increased net rim hoop compression. However, thermal
stresses due to frictional heating reverse the as-manufactured residual
compressive state. In particular, high-performance stop braking may
result in large net hoop tension in the rim. When contact and thermal
loads interact, the effects of braking dominate the process. The
presence of tensile residual hoop stress at the wheel tread has been
shown to favor the formation and growth of fatigue cracks, threatening
the safety of train operations. The paper provides a description of the
analytical methodology and results of its application to a
representative class of commuter service. Comparisons of the
predicted depth of rim stress reversal with the thermal cracking
observed in the wheels of this fleet provides confidence in the ability
of the technique to assess the likelihood of thermal crack development
in other types of commuter operations and in railroad freight service.
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