Abstract
In the first report, it was shown that, as far as the mode I (opening type) fracture occurs, the criterion ( eI criterion) based on the mode I contribution of Eψ (crack energy density in an arbitrary direction) is effective from completely elastic fracture to elastic-plastic fracture with large yielding region through the application of eI criterion to the fractures of an inclined crack under tensile type loading. However, the mode II (shear type) fracture may occur under some conditions. So, in this paper, the criterion (eIIψmax criterion) based on the mode II contribution of eψ is proposed as the criterion for the mode II fractψre first. Subsequently, the fracture experiments of an inclined crack under shear type loading are carried out and, based on the experimental results, its applicability to mode II fractures is shown in addition to the applicability of eI criterion to mode I fractures and, moreover, the criterion for judging fracture mode is discussed. Finally, by summarizing the results in this paper and those in the first report, the most generalized mixed-mode fracture criterion which can also judge fracture mode is given.
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