The fatigue life of the proposed D-7 freight car truck springs with 4 1/4-in. travel and the standard D-5 springs with 3-11/16 in. travel have been experimentally compared. Due to the unequal travels, the springs were fatigue tested on an equal energy basis for a reasonable service loading. The fatigue tests were of the constant amplitude cycle type to two million cycles. Twenty specimens of each spring variation were tested. Results indicated the proposed D-7 springs have a significantly lower failure rate equal to about one third that of the standard D-5 springs.

  • Supplemental Notes:
    • Direct requests to J.G. Britton, Director of Operations.
  • Corporate Authors:

    Association of American Railroads Research Center

    3140 South Federal Street
    Chicago, IL  United States  60616
  • Authors:
    • Cook, R M
  • Publication Date: 1975-10

Media Info

  • Features: Figures; Tables;
  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00139456
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: No. R-194 Res. Rpt.
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM