A533B-1鋼の弾塑性破壊じん性および破壊抵抗の評価

概要

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The elastic-plastic fracture toughness J_<Ic> value and fracture resistance of A533B-1 steel were evaluated using compact type (1/2CT, 1CT and 2CT) specimens. The results obtained are summarized as follows: (1) According to the standard method of the Japan Society of Mechanical Engineers (JSME), the J_<Ic> value can be evaluated accurately by using the smaller size of specimens compared with the ASTM method. (2) The valid J_<Ic> value becomes constant regardless of stress states or yielding conditions, when J integral is evaluated from a load-load line displacement curve. (3) As long as the flat fracture preceeds in the midthickness of the specimen, the tearing modulus, T_J(Δa_<max>), evaluated from the J-Δa_<max> resistance curve, becomes a material constant for a wide range of Δa_<max>. (4) Before the initiation of shear fracture, the following equation can stand; Δa_<ave>=0.38Δa_<max> Within this region, T_J(Δa_<ave>) evaluated from the J-Δa_<ave> resistance curve becomes constant in appearance. However, as the area of shear lips increases, T_J(Δa_<ave>) decreases rapidly.
社団法人日本材料学会の論文
1983-12-15