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

Twelve tests of 131 K4 headfree 39-in. long-toe bars averaged 1,279,600 cycles. Two joints ran to 2,000,000 cycles without failure; one bar failed from the base at a rail end, and nine bars failed from cracks starting in spike slots. Twelve tests of 115 K22 bars reduced gouging but did not entirely eliminate it. Brinell and tensile tests on 42 of 242 failed bars from service indicated lower hardness on the cross section at the center of the head of the bars than near the bar surface. Data from these tests indicated that bars which met both specifications of 70,000 psi minimum yield and 100,000 psi, minimum tensile strength had Brinell hardnesses of at least 207.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Authors:
  • Jensen, R S
• Publication Date: 1951-2

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 648-659
• Serial:
  • AREA BULLETIN
  • Volume: 52
  • Issue Number: 493
  • Publisher: American Railway Engineering Association

Subject/Index Terms

• TRT Terms: Cracking; Dynamic loads; Fastenings; Hardness; Stresses; Technology; Tension; Tie bars
• Uncontrolled Terms: Tensile stress
• Geographic Terms: United States
• Subject Areas: Materials; Railroads;

Filing Info

• Accession Number: 00040590
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM