In this paper, validity of the deterministic approach to transfer the fracture toughness Jc obtained with different thickness specimens was demonstrated. For this purpose, applicability of the (4δt, σ22c) failure criterion [1] was verified to transfer Jcs obtained for different specimen thicknesses in the fracture toughness database obtained from decommissioned Shoreham reactor vessel steel [2, 3]. The material tested was ASTM A533 Grade B Class 1 ferritic steel tested in the ductile-to-brittle transition temperature region. The critical value σ22c for twelve types of specimens (thickness in the range of 8 to 254 mm) showed only 4% variation. The fact that these critical values were always reached at the specimen mid-plane and the fact that cleavage always initiated at the specimen mid-plane supported the validity of the deterministic approach. Because the (4δt, σ22c) failure criterion requires only “single” set of test data for Jc transfer and because σ22c shows only a few % scatter, it seems to have a possibility to replace what Weibull stress is expected to do.

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