摩擦圧接継手の耐破壊性能について : S45Cの摩擦圧接継手の場合

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In order to determine the requisite value of toughness for friction welded joints on the basis of fracture mechanics, Charpy impact test and fracture toughness test were carried out various temperatures on the friction welded butt joints composed of carbon steel JIS, S45C and the base metal. The experimental results indicated that the Charpy adsorbed energy of the friction welded joints was almost equal to that of the base metal in the temoerature range below room temperature, while the absotbed energy of the joints was about a half of those for the base metal adove room temperature. The fracture youghness of the friction welded joints increased with an increase in temperature, but the toughness was slightly lower than those of the base netal over the whole temperature range. Particularly, in the temperature range above 185K, the value of the net section stress σ_net for fracture of the joint was higher than the 0.2% proof stress of the base metal. When the transition temperature for the Charpy absorded energy was compared with that for the fracture toughness, the former was much hifher than the latter. This suggests that the fracture toughness for the joints is high enough, evev when the Charpy absorbed energy is low. Furthermore, the usable critical stress for the friction joints with circumferential or penny-shaped cracka was estimated for vatious kinds of specimen size and temperature based on the experimental results of fracture toughness.
社団法人日本材料学会の論文
1990-10-15

摩擦圧接継手の耐破壊性能について : S45Cの摩擦圧接継手の場合

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