Technical Reports

Fatigue Behavior of Railcar Wheel Steel at Ambient and Elevated Temperature

  • 01
  • Aug
  • 2003
AUTHOR: Federal Railroad Administration
KEYWORDS: Fatigue Behavior of Railcar Wheel Steel at Ambient and Elevated Temperature; material behavior; fatigue performance; TC128; railcar wheels; forgings
ABSTRACT: This report presents the results of a material property test program undertaken on a Class B railcar wheel steel. This work was performed to obtain relevant fatigue data that may be used in support of a larger effort exploring the applicability of fatigue-based acceptance criteria for passenger and transit railroad wheels. Classical stress-life (S-N) curves were developed for AAR Class B railcar wheel steel with specimens removed from the tread area of an as-forged railcar wheel. The specimen geometry was a standard hourglass fatigue test specimen with a low stress concentration (Kt) of 1.05. Fatigue testing was performed at stress ratios of –1.0, 0.05, 0.5, and 0.7. Testing was performed at ambient, 500°F, and 1000°F using high current resistance or convection methods. Endurance limit data was obtained for all Rratios, although for the 1000°F condition there did not appear to be a clear endurance limit transition. These endurance limit data were used to estimate the Sines parameters, A and α.