Technical Reports

Wheel Failure Mechanisms of Railroad Cars- Interim Report

  • 01
  • Jan
  • 1986
AUTHOR: Britto R. Rajkumar, Daniel H. Stone, George P. Carpenter, Gerald J. Moyar
SUBJECT: Evaluation
KEYWORDS: Wheel Failure, Low Stress Wheel Designs, Residual Stress Fields, Heat Loss, Flange, Back Rim Crack
ABSTRACT: This Interim Report of the FRA sponsored Wheel Failure Mechanism Program was prepared in fulfillment of contractual requirements to provide a major mid-term technical progress report on the status of on-going research. It is not a final report, and although it does provide technical highlights and observations on many of the project tasks, it is not intended at this time to provide conclusions. One of the major purposes of this interim report is to solicit timely suggestions and critiques from our sponsors as well as interested parties in the railroad industry and technical community. The overall purpose of this research program is to develop understanding of the mechanism of wheel failure. At this time in the program, good progress is being made toward achieving many of the task objectives and several important observations and correlations are suggested in this report, although it is too early to offer complete conclusions. Some highlights: 1) demonstration, by review of derailment data, of the superiority of low stress wheel designs in their resistance to fracture; 2) use of cyclic plasticity data to predict levels of residual stress in wheels testsd on the RDU; 3) development of finite element techniques to predict residual stress fields from saw-cutting displacements; 4) determination of the amount of heat lost at the wheel/rail interaface; 5) formulation of fracture mechanisms for flange and back rim crack.
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