弾塑性破壊靱性による遷移温度域K_<IC>の評価に関する研究

概要

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K_<IC> values in the transition region are important for the integrity of large-size structures such as rotor shafts and pressure vassels. In order to evaluate this value, it is necessary to test an elastic-large test based on ASTM Standard E399. However, such a test is practically impossible. It is necessary to develop an elastic-plastic fracture toughness test which can easily evaluate the K_<IC>-value from the results of small specimens. The features of a cleavage fracture in the ductile-brittle transition region are (a) large scatter, (b) significant size effect. The new method proposed is based on both characteristics of the cleavage fracture. The new method is called the β-W method. The K_<IC> is given by the following equation.β_m/(2.5+β_m)=1-exp{-(K_<IC>(β・W)/b)^c}(b : scale parameter, c : shape parameter) Evaluated values based on the β-W method show a good correlation with K_<IC> based on the test method of ASTM Standard E399.
一般社団法人日本機械学会の論文
1987-06-25