Technical Reports

Nondestructive Measurement of Longitudinal Rail Stresses (Final Report)

  • 01
  • Jan
  • 1978
AUTHOR: D.M. Egle, D.E. Bray
OFFICE: RPD
REPORT NUMBER: FRA/ORD-77/09.1
SUBJECT: Evaluation
KEYWORDS: Rail Stress Management, Nondestructive Measurement, Ultrasonic Stress Measurement, Acoustoelasticity, Guided Waves
ABSTRACT: An ultrasonic probe has been designed, evaluated, and shown capable of measuring longitudinal stress changes in railroad rails. The probe utilizes the effect of applied stress on wave velocity (acoustoelastic effect) to determine the stress change. Both laboratory and field evaluation has shown that the probe is capable of measuring stress changes with an accuracy of +/- 6.9 MN/m^2 (+1 ksi).

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