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

Six tests of U.S.S. compromise joints, from 132 RE to 115 RE rail section averaged 288,800 cycles. All of the failures originated at the center of bar length at the change of section at the base of the bar. Six tests of Du-Wel compromise joints from 132 RE to 115 RE rail section avaraged 237,600 cycles. Five of the failures were from the base and one was from the top, and all six failures started at blowholes or porosity within the cast steel. Five tests of 115 RE, 36-in. headfree, bars with milled easements 1-1/2 in. long and approximately 0.200 in. in depth averaged 278,080 cycles. Two bars failed through the center of the milled easement and two companion bars revealed cracks in the easements. Fatigue tests on small specimens cut from joint bars tested under two ranges of stress indicated endurance limits from 26,000 to 72,000 psi. Both increasing the Brinell hardness and grinding the surface, in general, increased the endurance limit.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Authors:
  • Jensen, R S
• Publication Date: 1957-2

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 1005-25
• Serial:
  • AREA BULLETIN
  • Volume: 58
  • Issue Number: 535
  • Publisher: American Railway Engineering Association

Subject/Index Terms

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

Filing Info

• Accession Number: 00040586
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM