602 対向カップ型試験片を用いた自動車用薄板スポット溶接部の疲労特性評価(GS.F-1 疲労)

概要

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The production of double-cup (DC) specimen of spot-welded joint of high strength steel sheet is newly accomplished. And then, fatigue tests of various steel sheets with tensile strength ranging from 270MPa to 980MPa are conducted under multiaxial loading conditions. Fatigue strength of high strength steel is much higher than mild steel, while fatigue strength of JIS standard specimen is almost equal regardless of steel grade. In order to consider these test results, finite element analyses of both joints under shear loading are carried out. It is shown that rotation of spot weld by loading is lower due to its higher rigidity and stress state is close to pure shear in the case of DC specimen, which may lead to the fair evaluation of the effects of steel grade.
一般社団法人日本機械学会の論文
2007-10-24