FATIGUE TESTING OF RAIL BOLT HOLES COLD-EXPANDED BY BOEING COMPANY
The Association of American Railroads investigated the improvement in resistance to fatiguing at rail bolt holes by cold expansion of the hole diameter. The specimens were prepared by the Boeing Company using their "Split Sleeve Expansion System" to cold-work the bolt holes. The loading cycle was selected to simulate the cyclic reversal of flexure of rails in service. However, the loads were much higher than service loads to accelerate fatigue crack nucleation. It was found that the cold-worked specimens failed at other locations before bolt hole failure could occur while un-cold-worked specimens failed at the bolt holes.
- AAR Metallurgy Division, Project No. H-120. Sponsored by Boeing Commercial Airplane Company, Seattle, Washington.
Chicago, IL United States 60616
- Wisnowski, M J
- FLEMING, L D
- Publication Date: 1978-10
- Features: Figures; References;
- Pagination: 24 p.
- TRT Terms: Bolts; Cold working; Cracking; Failure; Fatigue tests; Holes; Rail (Railroads); Rail joints; Stresses; Test facilities
- Uncontrolled Terms: Crack propagation
- Old TRIS Terms: Bolt holes; Rail ends; Rail failure; Rail stress
- Subject Areas: Railroads; Terminals and Facilities;
- Accession Number: 00188123
- Record Type: Publication
- Source Agency: Association of American Railroads Technical Center
- Report/Paper Numbers: AAR Rpt R-327 Res Rpt.
- Contract Numbers: P.O. Y311716-0935 N
- Files: TRIS
- Created Date: Feb 27 1979 12:00AM