Abstract
nternational Institute of Welding (IIW) recommends that fatigue strength of welded joints is evaluated by using Hot Spot Stress (HSS). In this study, the fatigue strength evaluation method with HSS was applied to welded test piece, in which a hanging structure of a thin plate box with railway vehicle was mocked up. HSS calculated by FEA model with welding beads showed good agreement with experimental result. And S-N curve of the thin plate structure, which was obtained by fatigue test of the hanging structure, gave lower slope than S-N curve recommended by IIW. (So, S-N curve would be determined for every thickness of plate.)
