ＪおよびＪ＾積分評価における径路積分法と仮想き裂進展法の関係について

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  • On Relation between Contour Integral and Virtual Crack Extension Method of J- and J^^<SUP>-</SUP>Integral
  • J オヨビ Jセキブン ヒョウカ ニ オケル ケイロ セキブンホウ ト カソウ

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In this paper, the methods for evaluating the nonlinear fracture mechanics parameters J-and J^--integral are discussed in the framework of the virtual crack extension method. The equation for the virtual crack extension method was derived to evaluate the J-integral from the viewpoint different from the original method proposed by Parks or Hellen. Moreover, the equation for evaluating the J^--integral was derived using the same procedure as in the J-integral. The relation between the contour integral and virtual crack extension method is also discussed. Several numerical examples are presented to verify the validity of the equations derived in this paper.

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