In structural integrity assessment for nuclear reactor technology, one of the most important subject is to develop an estimation procedure of the cleavage controlled fracture toughness K
IC from standard Charpy V surveillance test data for neutron-irradiated pressure vessel steels.
This paper proposes an empirical representation of K
IC fracture toughness transition curve for both unirradiated and irradiated A533B steels. The fitting curves derived are written in forms such as,
where K
IC(C
v) and K
Id(C
v) mean the plane strain fracture toughness parameters characterizing an onset of the cleavage instability under static and dynamic loading conditions respectively, C
v is a value of standard Charpy V absorbed energy at a test temperature concerned and C
v-us is a upper shelf energy for the unirradiated steel.
It is here demonstrated that the estimated values of KIC(Cv) and KId(Cv) show a good agreement with valid K
IC and KId determined experimentally for both unirradiated and irradiated steels.
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