局部ひずみによるスポット溶接構造の疲労強度推定

概要

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A local strain approach has been studied to predict the fatigue strength of spot welds on thin steel structural members under bending. The strains on the inner and outer surfaces of the sheet near a nugget, where a fatigue crack would appear, were measured. The results showed that the strain on the inner surface is greater than that on the outer surface, and that the position of the sheet is under the combined load of an axial force and a bending moment. The fatigue tests of smooth specimens were performed under the same load condition as the position of sheet on the member using a developed combined loading system. It was confirmed by comparison of Δε-N_f diagrams that the strength of smooth specimens under the combined load makes an accurate prediction of the strength of spot-welded members in terms of the local strain.
1989-08-25