FRACTURE MECHANICS DATA FOR THREE CLASSES OF RAILROAD WHEEL STEELS
Three railroad wheel materials--Class LR rim, Class BR rim, and Class CE plate--have been studied by impact and fracture mechanics techniques. The Charpy impact testing was done to determine the 50% fibrous fracture appearance transition temperature (FATT), which was used in a correlation of the fracture toughness data that were obtained. Fracture toughness data were obtained on ASTM compact specimens: crack propagation rate data were obtained during the fatigue precracking stage. Log-log plots of crack propagation rate versus stress intensity factor range all have a slope of about three. The Class CE plate material had the lowest fracture toughness at room temperature, while the Class LR rim material had the highest. The Class BR rim material was also studied at 115 degrees F and 245 degrees F. The latter temperature is close to FATT for the material, and a J integral analysis was used to reduce those data. Fracture toughness data are presented for excess temperatures (excess temperature is the fracture toughness test temperature minus FATT) from about -240 degrees to 0 degrees F. Semilogarithmic plots of K sub Ic and the K sub Ic/yield strength ratio versus excess temperature yield reasonably straight lines, suggesting that determination of FATT for another railroad wheel steel can lead to a good estimate of the fracture toughness.
- Supported in cooperation with the Association of American Railroads, Federal Railroad Administration and Railway Wheel Association. Sixth International Wheelset Congress, October 22-26, 1978, Colorado Springs, Colorado.
American Iron and Steel Institute230 North Michigan Avenue
Chicago, IL United States 60601
- OPINSKY, A J
- Publication Date: 1978-10
- Features: Figures; References; Tables;
- Pagination: 14 p.
- TRT Terms: Cracking; Fracture mechanics; Fracture properties; Low temperature; Metallurgy; Structural analysis; Tests; Wheels
- Uncontrolled Terms: Crack propagation
- Old TRIS Terms: Wheel metallurgy
- Subject Areas: Railroads; Vehicles and Equipment;
- Accession Number: 00184179
- Record Type: Publication
- Source Agency: American Iron and Steel Institute
- Report/Paper Numbers: Volume 2 Tech Paper
- Files: TRIS
- Created Date: Dec 29 1978 12:00AM