スポット溶接部における疲労き裂進展の破壊力学的研究

抄録

The behavior of fatigue crack growth in the single spot weld tension shear specimens was studied by experimental and analytical fracture mechanics. Variation of the shape and size of fatigue fracture surfaces was observed and measured by beach mark techniques, and crack growth rate was determined. The crack growth rate in the plate thickness direction was related with the stress intensity factors which were detemined by the analyses of a plate with a semi-elliptic surface crack by the influence function method and the super-position method.