TWELFTH PROGRESS REPORT OF THE ROLLING-LOAD TESTS OF JOINT BARS

This report covers tests of joint bars conducted during the past year. The criterion for bar failure is taken to be the number of cycles of loading to propagate a fatigue crack to one-half of the bar height. 1. Twelve tests of 132K44 headfree, long-toe bars with pressed easements averaged 832,290 cycles in the rolling-load tests. Physical properties of these bars were well above AREA specifications. 2. Twelve tests of 132 RE headfree, 36-in. bars with pressed easements averaged 406,590 cycles, an average only about half as great as previous tests on this type of bar. 3. Tests on five 115 RE bars which failed in service indicated low hardness and low physical properties. 4. Tensile tests on 20 specimens from 50 failed bars from service for 100-lb rail indicated that 11 of the 20 passed the AREA specification of 100,000 psi tensile strength and 8 of the 20 passed the AREA specification of 70,000 psi yield point. 5. Micrographs on both laboratory tested bars and failed bars from service indicated depths of decarburization from less than 0.001 in. to 0.028 in.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Authors:
  • Jensen, R S
• Publication Date: 1954

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 814-828
• Serial:
  • AREA BULLETIN
  • Volume: 55
  • Publisher: American Railway Engineering Association

Subject/Index Terms

• TRT Terms: Dynamic loads; Fastenings; Fatigue (Physiological condition); Hardness; Stresses; Technology; Tension; Tie bars
• Uncontrolled Terms: Tensile stress
• Geographic Terms: United States
• Subject Areas: Railroads; Safety and Human Factors;

Filing Info

• Accession Number: 00040824
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM