Analyses of Elastic-Plastic and Creep Crack Parameters by the Crack Model Considering the Discontinuity in the Cracked Plane
A crack model in which the discontinuity in the plane containing a crack is considered and which can be regarded as the most generalized model of Dugdale model was proposed in the previous paper  (we call it the DWA model for simplification of description). This model is applicable to the evaluations of crack parameters like crack energy density  , CTOD and CTOA under an arbitrary constitutive equation and an arbitrary load history, and it was tried to apply to elastic-plastic  and elastic- creep  problems in order to evaluate the crack energy densities in those problems. In this paper, more detailed analyses of the DWA model by means of finite element method to both elastic-plastic and elastic-creep stationary cracks are carried out and the availability and simplicity of the model in the evaluations of crack parameters are demonstrated through the evaluations of crack energy density and CTOD based on these analyses and the comparison between the values of crack energy density above and those of J-integral and ε J-integral  evaluated by using the continuum model.
KeywordsFinite Element Analysis Continuum Model Crack Model Plane Element Dugdale Model
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