FRACTURE ANALYSIS AND MATERIAL EVALUATION OF BUTTS FROM "F" COUPLERS CAST BEFORE MARCH 1970

The areas of fracture surfaces projected on the load-bearing planes of a group of coupler butts were measured. Division into two sub- groups of high and low mileage revealed no correlation of fracture area to mileage, but division into subgroups according to microstructure and casting defect type did give substantial increases of fatigue fracture area for components with large defects and increases of sudden rupture area for components with mixed microstructures. Standard tensile and chemical test results are given for future correlation with over-all component tensile and impact tests.

• Supplemental Notes:
  • AAR Test Division Project No. M012, Railroad Coupler Safety Research and Test Project. Metallurgical analyses complementing physical tests in Report No. 7, RRIS 03 141431.
• Corporate Authors:

  Association of American Railroads Research Center

  3140 South Federal Street
  Chicago, IL  United States  60616
• Authors:
  • FLEMING, L D
• Publication Date: 1975-10

Media Info

• Features: Appendices; Figures;
• Pagination: 138 p.

Subject/Index Terms

• TRT Terms: Couplers; Failure; Life cycle analysis; Mechanical failure; Metallography; Metallurgy; Tension
• Uncontrolled Terms: Fatigue analysis; Observations; Tensile stress
• Subject Areas: Design; Railroads;

Filing Info

• Accession Number: 00141432
• Record Type: Publication
• Source Agency: Association of American Railroads Research Center
• Report/Paper Numbers: N. 8 (AAR N. R242) Tech. Rpt.
• Files: TRIS
• Created Date: Nov 3 1976 12:00AM