THE EFFECT OF SURFACE FILMS ON FATIGUE CRACK INITIATION

The suppression of fatigue crack initiation by surface films can be viewed in terms of two mechanisms: (1) protection against environmental attack, and (2) suppression of surface plasticity. These two mechanisms are described in detail. Environmental protection requires a flawless coating which is impermeable to the active component of the environment and resistant to fracture under repeated cyclic strain. Suppression of plasticity requires a film with an elastic modulus greater than the substrate metal. The stiffer coating repels dislocations from the surface and suppresses the development of slip bands and crack initiation. (Author)

  • Supplemental Notes:
    • Availability: Pub. in Corrosion Fatigue, p201-210 1972.
  • Corporate Authors:

    Midwest Research Institute

    425 Volker Boulevard
    Kansas City, MO  USA  64110-2299
  • Authors:
    • Crosskteutz, J C
  • Publication Date: 1972

Media Info

  • Pagination: 14 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00048075
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: TR-12 Tech Rpt
  • Contract Numbers: N00014-71-C-0020
  • Files: TRIS
  • Created Date: Nov 14 1976 12:00AM