熔接々手の脆性破壊(第 2 報) : 形状的拘束の影響

概要

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The transition temperatures of butt weld joints with internal defects were investigated with specimens, the dimensions of root face (G) and reinforcement (δ) of which were changed in series. Experiments showed that the changes in dimensions of G and δ affected the transition temperatures of butt joints (Fig. 8). Supposing that the degree of geometrical constraint might be anticipated by the difficulty of the growth of plastc ranges originating from ends of G, and this difficulty would be proportionate to the yielding stress of the specimen, tensile tests were made to investigate stress-strain relations by specimens of Fig. 9,and the results as in Fig. 11 were obtained, in which the yielding state was defined by the intersection of two curves, A and B. Then, the effectiveness of the reinforcement under tensile load was calculated on the Neuber theory for semi-infinite plate with a slight projection to correct the nominal sectional area of the specimen. Using thus determined sectional areas, the yielding stress values (σ'_<yw>) of the specimen could finally be decided. It was proved that the fracture transition temperatures of joints were raised as the combinations in dimensions of G and δ increased the values of σ'_<yw> (Fig. 14).
社団法人溶接学会の論文
1955-04-01