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  United States  64110-2299
• Authors:
  • Crosskteutz, J C
• Publication Date: 1972

Media Info

• Pagination: 14 p.

Subject/Index Terms

• TRT Terms: Anodic protection; Anticorrosion coatings; Coatings; Corrosion protection; Cracking; Electroplating; Failure; Fatigue (Mechanics); Fatigue cracking; Film; Preventive maintenance; Protective coatings; Surface preparation
• Uncontrolled Terms: Crack propagation
• Old TRIS Terms: Anodic coatings; Crack formation prevention; Diffusion coating; Diffusion coatings
• Subject Areas: Marine Transportation; Materials;

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