FATIGUE TESTS OF FREIGHT CAR AXLES 5 1/2 TIMES 10 INCH JOURNALS

The series of fatigue tests was concluded on a proposed design of raised wheel seat freight car axle with "as forged" (unmachined) body between wheel seats. The proposed design has a considerably greater fatigue strength in the wheel fit than the Standard Freight Car Axle (Black Collar Design). One group of Standard Freight Car Axles had an abnormally low fatigue resistance of 13,000 psi in the body portion between the wheel seats. This value was raised to the normal value of 17,500 psi by stress relieving at 1150 degrees F for six hours. One group of axles of the proposed freight car design had a similarly low body fatigue resistance of 13,000 psi. Machining the axle body was found to be beneficial in improving the fatigue resistance. This finding may mean that unfavorable residual stresses due to straightening were removed by machining.

• Corporate Authors:

  Association of American Railroads

  3140 South Federal Street
  Chicago, IL  United States  60605
• Publication Date: 1955-6

Media Info

• Features: Figures; Photos; Tables;
• Pagination: 59 p.

Subject/Index Terms

• TRT Terms: Axles; Fabrication; Fatigue (Mechanics); Freight cars; Railroad cars; Residual stress; Stresses; Technology; Vehicle design
• Geographic Terms: United States
• Old TRIS Terms: Axle fatigue; Car design
• Subject Areas: Design; Railroads;

Filing Info

• Accession Number: 00040311
• Record Type: Publication
• Report/Paper Numbers: MR-242 Prog Rpt
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM