Technical Reports

Stress Reconstruction Analysis of Wheel Saw Cut Tests and Evaluation of Reconstruction Procedure

  • 01
  • Sep
  • 1993
AUTHOR: Federal Railroad Administration
OFFICE: RPD
SUBOFFICE: RPD-30
REPORT NUMBER: DOT/FRA/ORD-93/18
KEYWORDS: Residual Stress; Saw Cut Tests; Wheels
ABSTRACT: This report is the fourth in a series of engineering studies on railroad vehicle wheel performance. The results of saw cut tests performed on one new and one used wheel designed for a fleet of multiple unit (MU) power cars are summarized and analyzed. Reconstructed residual stresses are computed in the usual manner, namely: by modeling the deformed cut wheel with finite elements and prescribing displacements to close the cut. Similar cases are computed, with thermal stresses calculated from a companion finite element model to play the role of residual stresses, in order to simulate the experiment reconstruction analysis. Comparison with the exact thermal stresses show that the conventional reconstruction procedure is not accurate, even when the cut opening profile data has been supplemented by measurements of radial displacement along the cut, relative to the cut tip. Better results are obtained from the simulation of an experiment with measurements of absolute radial displacement. Several possible refinements of the saw cut test measurement procedures are suggested.
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