Abstract
KIC 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 KIC-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 KIC is given by the following equation.βm/(2.5+βm)=1-exp{-(KIC(β·W)/b)c}(b : scale parameter, c : shape parameter) Evaluated values based on the β-W method show a good correlation with KIC based on the test method of ASTM Standard E399.
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