大規模降伏・混合モード荷重条件下にあるき裂先端近傍の応力・ひずみ場

概要

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Large deformation finite element analyses based on Gurson's yield function are carried out for single-edge cracked specimens subjected to bending moment and shearing force, and the stress/strain field around a crack tip under the conditions of large scale yielding and mixed mode loading is examined. The crack tip under mixed mode loading is surrounded by a stress/strain field with HRR singularity, which is uniquely represented by J-integral J, J_I and J_<II> (J_I: mode I component, J_<II>: mode II component), throughout small scale yielding and large scale yielding. The fracture process zone of the crack tip is discussed based on the distributions of equivalent plastic strain ε_p and void volume fraction f. The size of the fracture process zone due to ε_p becomes larger, if the mode II component is more predominant. On the other hand, the size of the fracture process zone due to f becomes larger, if the mode I component is more predominant. The implications of this study on the behavior of ductile crack initiation from a mixed mode crack are also discussed.
社団法人日本機械学会の論文
1990-03-25