A Study on Experimental Evaluation of CED in an Arbitrary Direction Based on Load-Displacement Curves

Takao Utsunomiya, Katsuhiko Watanabe

Research output: Contribution to journalArticlepeer-review


The CED (crack energy density) in an arbitrary direction, εφ, is expected to be a parameter to describe not only elastic fracture but also elastic-plastic fracture of a mixed mode crack. This εφ is related to load-displacement curves of specimens and it was shown in the elastic region that εφ can be evaluated from experimentally obtained load - displacement curves with practically sufficient accuracy based on the relation. In this paper, the applicability of the method to elastic-plastic fracture problems is examined. That is, the load-displacement curves of specimens with a notch (or crack) inclined to the loading axis are obtained by experiments in the elastic-plastic region, and εφ is evaluated from those curves. The results are compared with those of finite element analyses, and the availability of evaluation method based on experimentally obtained load-displacement curves is demonstrated. Moreover, the method is applied to a fracture problem and it is shown that the method can be a powerful tool to evaluate the critical value of εφ (fracture toughness).

Original languageEnglish
Pages (from-to)99-105
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Issue number545
Publication statusPublished - 1992
Externally publishedYes


  • CED
  • Fracture Criterion
  • Fracture Mechanics
  • Fracture Toughness
  • Load-Displacement Curve
  • Mixed-Mode Crack

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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