箱形断面T字形結合部材のスポット溶接部の疲労強度

概要

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In order to develop a prediction method for the fatigue strength of spot welds in thin steel structures such as automobile bodies, bending fatigue tests were made on T-shaped members. The fatigue test results expressed in terms of the strain range, measured on the outer surface near the nugget, did not coincide with predictions from the fatigue strength data of standard tensile shear specimens. FEM analysis and strain measurement showed the difference to be due to the fact that loads acting on spot welds and the stress states are different between the standard specimens and the members. A joint specimen having flanges under a combined load of a tensile shear force and a bending moment, which simulates the stress distribution near the nugget, has been proposed. It was confirmed by fatigue tests that the strength of the specimen is an accurate prediction of the strength of the member in terms of the strain rage.
1986-08-25