The JSME standard (S-001) for determination of J
IC recommended to draw the blunting line or to measure the stretched zone width by an electron microscope. However, this procedure is taken trouble to measure these values. Following the British Standard BS5762, the CTOD value, Φ
i, at the onset of the ductile fracture is determined by using the CTOD versus fibrous crack extension. Since the fibrous crack extension may be measured by an optical instrument such as a travelling microscope the CTOD procedure is convenient in comparison with the J
IC procedure. It is expected to evaluate J
IC with J-CTOD relationship, if this relation ensures the linear function of CTOD. This paper proposed the method of determinating J
IC with J-CTOD relationship. To examine the validity for the evaluation of J
IC by using the proposed method, the fracture toughness tests were performed for HT60, SCW49 and SS41, respectively.
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