COMPARISON OF D-5 AND D-7 SPRING FATIGUE LIFE

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

• TRT Terms: Fatigue tests; Freight cars; Life cycle analysis; Mechanical fatigue; Railcar trucks; Specifications; Spring; Suspension systems; Trucks
• Uncontrolled Terms: Fatigue life
• Old TRIS Terms: Freight car component performance
• Subject Areas: Motor Carriers; Railroads; Vehicles and Equipment;

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