Other Reports

Report No. 28 - Residual Stress in Induction-Heated Railroad Wheels: Ultrasonic and Saw Cut Measurements

  • 01
  • May
  • 1995
AUTHOR: Raymond E. Schramm, Jacek Szelazek, Alfred V. Clark Jr.
OFFICE: RPD
REPORT NUMBER: NISTIR 5038
SUBJECT: Rail and Infrastructure Integrity
KEYWORDS: Railroad Technology, Birefringence Measurements, Transducers
ABSTRACT: [From the Introduction] This report deals principally with the ultrasonic measurement of residual stress in a set of 10 cast steel wheels of U.S. manufacture. They were all from the same heat, and so had the same chemical composition. Two wheels remained as manufactured with hoop compression in the rim. The others received three levels of induction heating at the tread to reverse the stress (give tensile stress in the rim). This form of heat damage should generate an idealized, axisymmetric stress state, in contrast to drag braking, where local high spots on the tread can lead to hot spots and stresses that vary around the circumference. Experimentally, an axisymmetric stress helps to reduce the number of ultrasonic measurements. It also greatly simplifies the labor (both experimental and computational) necessary to perform DE for an independent validation of the ultrasonic measurements.

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