EIGHTH PROGRESS REPORT OF THE ROLLING LOAD TESTS OF JOINT BARS

Twelve tests of 133 RE head contact 36-in. bars averaged 509,200 cycles. Twelve tests of 115 RE head free 36-in. bars averaged 1,462,450 cycles. Five of the joints ran to 2,000,000 cycles with no failure. Micrographs, taken on all failed bars, revealed decarburized bar surfaces to varying depths up to 0.024 in. No clearly defined correlation between cycles for failure and depth of decarburization was apparent. Brinell and tensile tests on 12 of 100 failed bars from service indicated higher hardness reading near the surface of the bars than at the center of the head. Ten of the 12 bars tested failed to meet the specifications of 100,000 psi, minimum tensile strength and 11 fell short of the 70,000 psi minimum yield point.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Authors:
  • Jensen, R S
• Publication Date: 1950-2

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 585-593
• Serial:
  • AREA BULLETIN
  • Volume: 51
  • Issue Number: 486
  • Publisher: American Railway Engineering Association

Subject/Index Terms

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

Filing Info

• Accession Number: 00040802
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM