スポット溶接継手の疲労強度に及ぼすばらつき因子の影響

抄録

In this study, the influence of scatter factors such as sheet thickness, nugget diameter and spot welding location of spot-welded joints on the fatigue strength was investigated. Two kinds of spot-welded joints under shear torsion loading and bending loading were used as fatigue testing specimens. The degree of influence of the scatter factor on the fatigue strength was expressed by sensitivity. Analyzing the sensitivity of the joints, the sheet thickness sensitivity and nugget diameter sensitivity of the shear torsion joints with large torsion acting on the nugget were the same as those of tensile shear joints with no torsion. Separating into sensitivity for each general load component, the sensitivity of the shear torsion joints is mainly due to bending and the influence of torsion is small. The theoretical and experimental values of the sensitivity of the shear torsion joints and the bending joints were in good agreement.