Fifth International Conference on Urban Earthquake Engineering
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Tokyo Institute of Technology, Tokyo, Japan
アブストラクト
There is a possibility of under-matched welded joint in case of high strength steel. When seismic force applied to under-matched joint, deposit metal yields first and it cause strain concentration and plastic constraint in the deposit metal. Previous study showed that the strain concentration at a weld defect reduces crack initiation life significantly and there is almost no crack initiation life. Therefore, evaluation of crack propagation behavior is important. This study is aiming to clarify the crack propagation behavior in the under-matched welded joint. Fracture mechanics approach showed that plastic constraint can extend propagation life, because plastic constraint reduces crack opening and crack propagation rate. However, the effect of the plastic constraint was small, thus the propagation life of under-matched joint was governed by yield strength of deposit metal.
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