Questions of fracture characteristics of tank car steels have been fully clarified by statistical examination of fracture properties based on rational fracture mechanics criteria. It is analytically proven that brittle fracture of tank cars is not a significant problem at any temperature of service. This independent finding is in agreement with general experience based on accident investigation and analysis. A clear relationship has been demonstrated between ASTM ferrite grain size and Dynamic Tear (DT) test rational criteria (true fracture mode for full section). It is possible to examine a metallographic sample and to predict within a narrow range of temperature the type of fracture to be expected for a tank car steel. The mechanical significance of deviations from unusual grain structures (such as mixed grain size, etc.) can be understood in terms of heat treatment or fire environments - based on the knowledge generated in this study. The relationship of plastic fracture properties to tearing type rupture of tank cars at elevated temperatures has been clarified.

  • Supplemental Notes:
    • This is a RPI-AAR Tank Car Safety Research and Test Project.
  • Corporate Authors:

    Association of American Railroads Research Center

    3140 South Federal Street
    Chicago, IL  United States  60616
  • Authors:
    • Pellini, W S
    • EIBER, R J
    • Olson, L L
  • Publication Date: 1975-8-20

Media Info

  • Features: Figures; References;
  • Pagination: 81 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00129196
  • Record Type: Publication
  • Source Agency: Association of American Railroads Research Center
  • Report/Paper Numbers: RA-03-4-32 Res. Rpt.
  • Files: TRIS
  • Created Date: Feb 4 1976 12:00AM