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Alternative Materials for Railcar Air-Brake Glad-Hand Gaskets

  • Author / Creator
    Hernandez Peralta, Rodrigo Arturo
  • The objective of this research was to examine the cold temperature limitation of the elastomeric material currently used in railcar airbrake glad-hand gaskets. A test plan to assess gasket material performance was designed based on gasket operating conditions and material properties. Standards, specifications and test protocols from the International Organization for Standardization [ISO], the American Society for Testing and Materials [ASTM], and the Manual of Standards and Recommended Practices from the American Association of Railroads [AAR MSRP] were used as a base reference for generating a detailed test plan. Hardness, compression stress-strain properties, and chemical compatibility were measured under different loading conditions and temperatures. For the compressive tests, a custom Material Testing System [MTS] gasket fixture was designed and manufactured. Randomized tests were performed on 30 gaskets provided by Canadian Pacific. Two alternative elastomeric materials were selected through a decision analysis: EPDM and CR. Randomized tests were performed on 30 gaskets made of each alternative elastomeric material. The alternative material gaskets were produced by a third-party manufacturer. Gasket performance and features were evaluated with the same test plan in all cases. Statistical analysis of results showed that CR maintained good performance for sealing purposes in cold temperature. CR was more flexible when manipulating it, than both EDPM and the current material used in gaskets during all conditions. A protocol for testing airbrake glad-hand gaskets in-service was developed based on the hardness test. A group replacement policy simulated numerical example was examined.

  • Subjects / Keywords
  • Graduation date
    Fall 2018
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/R3Q52FV5V
  • License
    Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.