アーク溶接構造の疲労寿命予測手法

（公称構造応力による両側隅肉アーク溶接重ね継手への適用）

抄録

One of fatigue life prediction methods is that there is the method using a nominal structural stress. Nominal structural stress is one of the parameters to predict the fatigue life of the spot welded structure. In previous studies, the calculation method for accurately obtaining the nominal structural stress was proposed, it was shown that the fatigue life data can be arranged by the nominal structural stress. If the nominal structural stress (NS stress) which arises at a bead end can be obtained with sufficient accuracy, it becomes possible to predict the fatigue life of arc-welded structure. The nominal structural stress means the maximum principal stress which arises at the vicinity of a welding bead end. In this study, the nominal structural stress calculation method was applied to a double fillet lap joint of arc weld. As the result, the fatigue data could be arranged by the nominal structural stress in the narrow bandwidth. It was shown the possibility to predict the fatigue life of the arc welded structure by the nominal structural stress.