Dugdale modelにおける仮想き裂の物理的意味に関する一考察

概要

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Cohesive zone model is a very strong modeling method in order to investigate the deformation of cracked body even though it does not satisfy the small scale yielding condition. A concept of fictitious crack, which corresponds to plastic zone, is applied in cohesive zone model and fictitious crack has a certain opening displacement although this part is continuous body. Physical meaning of the crack opening displacement of fictitious crack in cohesive zone model is investigated. Dugdale model is adopted as a cohesive zone model. Crack opening profile and deformation ahead of crack tip in center cracked tensile specimen are calculated by Dugdale model, elastic-plastic finite element analysis and these results are compared to the measured ones. It is confirmed that the displacement of fictitious crack in Dugdale model corresponds to the integration value of plastic strain along the perpendicular on crack line. That is, fictitious crack can be interpreted as a source of the deformation, which is equal to the plastic deformation ahead of a crack tip.
社団法人日本船舶海洋工学会の論文
2003-03-20