The structural adequacy of freight car truck castings and wheels to resist fatigue damage is reviewed. The environmental load data described in an earlier report under this program and additional load data which have only recently become available are used to calculate the expected fatigue life under various assumptions of the stresses present in the components. It is found that under most conditions the components should not develop fatigue cracks. This confirms the observation that there are a relatively small number of fatigue failures of these components in service. Since failures of these components can lead to serious derailments, it is important that the circumstances leading to a higher risk of fatigue failure be identified so that under these circumstances truck components can be subjected to more frequent and stringent inspections under the railroad freight car safety standards of the FRA. The results of tests to determine the fatigue strength of wheel plates are also described. The tests showed that there is a substantial safety margin with respect to fatigue when one considers the effects of lateral loads acting on the wheel.

  • Supplemental Notes:
    • See also report dated May 75, PB-244 090.
  • Corporate Authors:

    IIT Research Institute

    10 West 35th Street
    Chicago, IL  United States  60616

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142

    Federal Railroad Administration

    Office of Research and Development, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Johnson, M R
  • Publication Date: 1977-10

Media Info

  • Pagination: 82 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00175480
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT-TSC-FRA-77-18 Final Rpt.
  • Contract Numbers: DOT-TSC-727
  • Files: NTIS, TRIS, USDOT
  • Created Date: May 31 1978 12:00AM