THEORETICAL AND EXPERIMENTAL COMPARISONS OF THE NONLINEAR ENERGY METHOD TO THE J-INTEGRAL, R-CURVE AND COD METHODS IN FRACTURE TOUGHNESS TESTING

Because of the current high degree of interest in the development of a standard nonlinear test method, analytical and experimental comparisons have been made between the R-curve, Crack Opening Displacement (COD), J-integral and nonlinear energy methods. A general definition of fracture toughness is proposed and the fundamental definitions of each method are compared to it. Experimental comparisons between the COD, J-integral, nonlinear energy and standard ASTM method have been made for a series of compact tension tests on several aluminum alloys. The fracture toughness values obtained by the COD method were significantly higher than the toughness values obtained by the other three methods. All of the methods displayed a tendency to yield higher toughness values as the thickness was decreased below the ASTM plane strain requirement.

  • Corporate Authors:

    George Washington Transportation Research Institute. Center for Intelligent Systems Research

    ,    
  • Authors:
    • Liebowitz, H
    • Jones, D L
    • Poulose, P K
  • Publication Date: 1975-6

Media Info

  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00127451
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: N00014-67-A0214-0018, NGR-09-010-053
  • Files: TRIS
  • Created Date: Dec 3 1975 12:00AM