Water vapor has been found to change the plasticity associated with fatigue crack propagation in an 0.05 wt.% carbon steel. Dislocation subcell size is increased, the extent of subcell formation decreased, and crack tip opening displacements decreased by the addition of water vapor to the testing environment. Fracture surface features are also altered by environment, consistent with the plasticity observations. Preliminary results for the aluminum alloy 6061-T6 indicate a somewhat different material response, yet to be clarified. The steel results are consistent with a strengthening of the material, or a decrease in material ductility, or both, within the cyclic plastic zone of the propagating fatigue crack.

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510
  • Authors:
    • Davidson, D L
    • Lankford, J
  • Publication Date: 1976-8-6

Media Info

  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00144056
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: SWRI-02-4268 Intrm Rpt.
  • Contract Numbers: N00014-75-C-1038
  • Files: TRIS
  • Created Date: Jan 16 1977 12:00AM