Comparative assessment of insulated rail joint assemblies

Insulated rail joint (IRJ) assemblies are subjected to increased dynamic loading relative to adjacent track, often in conjunction with poor track support conditions, such that their service performance is compromised. This situation is exacerbated under high axle load, heavy haul conditions, often resulting in premature failure. A metallurgical failure analysis has confirmed that fatigue failure of joint bars in the IRJ type currently used is associated with the presence of near-surface decarburisation, which results in a significant reduction in fatigue strength relative to the core material. The currently-used IRJ design and three alternative designs have been subjected to a laboratory test program which included measurement of joint bar strains under a range of loading conditions, fatigue testing under conditions which have been found to reproduce the inservice failure mode, and the properties of the joint bar materials. The results have been used to rank the four designs in terms of the probability of joint bar fatigue failures. The test program provides a basis for specifying qualification requirements for insulated rail joints to be used under heavy haul conditions.

Media Info

  • Pagination: 9p. ; PDF
  • Monograph Title: Rail - the core of integrated transport: CORE 2012: conference on railway engineering, 7-10 September 2012, Perth, Western Australia

Subject/Index Terms

Filing Info

  • Accession Number: 01532123
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Jul 29 2014 11:56AM