An evaluation of the fracture resistance of a stably growing crack by crack energy density. 5th report Comparison with the fracture resistances evaluated by CTOD and CTOA.

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  • き裂エネルギー密度による安定成長き裂の破壊抵抗評価 V  き裂先端開口変位,開口角による評価との比較
  • き裂エネルギ密度による安定成長き裂の破壊抵抗評価 (第5報, き裂先端開口変位, 開口角による評価との比較)
  • キレツ エネルギー ミツド ニ ヨル アンテイ セイチョウ キレツ ノ ハカイ

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Abstract

In the previous reports, an experimental method to evaluate the fracture resistance of a stably growing crack by crack energy density was proposed, and its applicability and superiority were shown through the applications of the method to the stable crack growth problems of thin plates and the comparison with the fracture resistances evaluated by the J-integral. In this report, experiments on the stable growth fractures of thin plates are carried out, the fracture resistances evaluated by CTOD and CTOA are obtained, and they are compared with prior fracture resistances evaluated by crack energy density. The results are as follows : (1) Both show a similar tendency in their variations with crack extensions as was expected theoretically. (2) In comparison with the latter, the former are scattered because of the difficulty of the measurement of local deformation around a crack tip. Therefore, the proposed method is superior to the method based on CTOD and CTOA in the ease of the measurement of these quantities necessary for evaluation. The validity of the instability criterion on crack extension proposed before is also shown ion the Appendix.

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