シャルピー衝撃試験結果からの破壊じん性 K_<Ic> の推定

概要

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This paper presents a method to predict the fracture toughness K_<Ic> and/or K_<Id> of steels using their Charpy impact test results and tensile properties. The fracture toughness,Charpy impact and tensile properties of 2 1/4Cr-1Mo, ASTM A508 Cl.1, A508 Cl.2 A508 Cl.3 and A533 Gr.B Cl.1 steels were measured and analysed on the basis of the excess temperature (test temperature minus FATT) and Rolfe-Novak correlation. The relationship between K_<Ic>/K_<Ic-us> and the excess temperature,where K_<Ic-us> is the upper-shelf fracture toughness K_<Ic> predicted by Rolfe-Novak correlation,discloses that the K_<Ic> transition curves of several stress are representable by only one trend curve of K_<Ic>/K_<Ic-us> or K_<Ic>/K_<Id-us> versus excess temperature relation. This curve is denoted as a "master curve". By using this curve,the fracture toughness of steel can be predicted using Charpy impact and tensile test results. By taking account of the scattering of both the fracture toughness and Charpy impact test results, the confidence limits of the master curve were also determined. Another approach top develop more general procedure of predicting the fracture toughness K_<Ic> is also discussed.
社団法人日本材料学会の論文
1986-08-15