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.

  • Supplemental Notes:
    • AAR Metallurgy Division, Project No. H-120. Sponsored by Boeing Commercial Airplane Company, Seattle, Washington.
  • Corporate Authors:

    Association of American Railroads Research Center

    3140 South Federal Street
    Chicago, IL  United States  60616
  • Authors:
    • Wisnowski, M J
    • FLEMING, L D
  • Publication Date: 1978-10

Media Info

  • Features: Figures; References;
  • Pagination: 24 p.

Subject/Index Terms

Filing Info

  • 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