A REVIEW OF NONLINEAR FRACTURE MECHANICS RELATIVE TO FATIGUE

This report reviews currently available parameters, methodology, and data that support further developments in elastic-plastic fracture mechanics (EPFM) technology for modeling fatigue crack growth rate (FCGR) behavior. In general, it can be stated that linearly elastic fracture mechanics (LEFM) parameters can be used to model FCGR behavior except when the zone of cyclic plasticity accompanying the crack process is large with respect to crack length and other structural length parameters. The literature provides two types of EPFM parameters which are available for modeling FCGR behavior when the limitations of LEFM are exceeded: one type is based on the characterization of the intensity of the crack tip stress-strain field, the other is based on the determination of a specific mechanical parameter which is evaluated at a point close to the crack tip. (Author)

  • Corporate Authors:

    Dayton University

    Research Institute, 300 College Park Avenue
    Dayton, OH  USA  45409

    Air Force Materials Laboratory

    Wright-Patterson Air Force Base
    Dayton, OH  USA  45433
  • Authors:
    • Weerasooriya, T
    • Gallagher, J P
    • Rhee, H C
  • Publication Date: 1979-9-30

Media Info

  • Pagination: 85 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00326108
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: UDR-TR-79-90 Final Rpt., AFML-TR-79-4196
  • Contract Numbers: F33615-78-C-5184
  • Files: TRIS
  • Created Date: Nov 19 1981 12:00AM