TENTH PROGRESS REPORT ON THE ROLLING-LOAD TESTS OF JOINT BARS

Twelve tests of 115 K4 headfree, oil quenched 36-in. bars averaged 748,500 cycles. Four tests of 132 RE headfree 36-in. bars, not oil quenched, averaged 78,750 cycles. Four tests of 132 RE headfree 36-in. bars, not oil quenched, with the top fishing surface cold worked by rolling averaged 90,770. Four tests of 132 RE headfree 36-in. bars, not oil quenched, with easements ground 1/16 in. in depth over the central 2 in. of the top fishing surface, increased the number of cycles to 182,900. For the 2 joints in which the easements were carried completely over the top surfaces of the bars, the average cycles increased to 316,650. Tensile tests on 81 specimens selected from 347 failed bars from service revealed that 36 percent passed the yield point specification of 70,000 psi and 69 percent passed the tensile strength specification of 100,000 psi.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Authors:
  • Jensen, R S
• Publication Date: 1952-2

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 878-892
• Serial:
  • AREA BULLETIN
  • Volume: 53
  • Issue Number: 500
  • Publisher: American Railway Engineering Association

Subject/Index Terms

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

Filing Info

• Accession Number: 00040814
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM