OS0714 非比例混合モード負荷における疲労き裂成長方向(OS7-3 解析・評価・き裂II,OS-7 多軸応力下における疲労損傷および疲労き裂進展2)

概要

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Experiments have been performed for the growth of fatigue cracks in circumferentially notched specimens subjected to cyclic torsion and tension. In the experiments, sequential and overlapping mode I and mode III cycles were applied to the crack in the specimen made of rail steel. According to the load conditions, co-planar cracks occurred or branch cracks propagated making factory roof morphology. For the investigation of incipient crack path direction, the elasto-plastic finite element analyses were performed with the combination of the maximum tangential stress (MTS) criterion. It is shown that MTS criterion including plasticity and sophisticated work hardening law are well suited to predict incipient crack growth directions.
2011-07-16