SERVICE TESTS OF VARIOUS TYPES OF JOINT BARS

Service tests on various types of joint bars were discussed. A description of two test installations each with five types of joint bars on tangent track was given. Stress measurements were made with strain gages placed at mid length of the bars in the Santa Fe 132RE test. The range of bending stresses developed under service conditions was compared with the bending stresses the joint bars were subjected to in accelerated rolling-load tests at the University of Illinois. The actual service stresses with respect to development of fatigue failure in these field tests were found to be only half as great as the range of stress in the accelerated rolling-load tests in the laboratory. To determine stress distribution along the length of the bar gages were placed at the top and bottom of the bar. Results obtained from these measurements show maximum stresses developed under diesel locomotives and under steam locomotives. An analysis on the frequency with which stresses of any given magnitude might be expected to be developed was given. The results obtained in these tests on tangent track indicate that the stresses developed in service in the head free design of joint bars for 132RE rail are well within the fatigue strength as determined by laboratory tests. It is expected that stresses will be higher on curved track.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Publication Date: 1950

Media Info

• Features: Figures;
• Pagination: p. 570-584
• Serial:
  • AREA BULLETIN
  • Volume: 51
  • Publisher: American Railway Engineering Association

Subject/Index Terms

• TRT Terms: Deformation curve; Load tests; Tie bars
• Subject Areas: Materials; Railroads;

Filing Info

• Accession Number: 00052446
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Jul 15 1974 12:00AM