抄録
Simplified analysis of creep crack growth under neutron irradiation was performed by using Double Cantilever Shear Beam (DCB) model in order to discuss the effect of neutron irradiation on the integrity of nuclear structure components. The model was assumed to consist of a creep damage zone of a strip of finite width including the plane of crack and a shear dominant elastic zone outside the creep damage zone. It was further assumed that the creep damage zone is in the state of uniaxial stress, and the creep crack growth was described in the framework of the Continuum Damage Mechanics. Then, by incorporating the constitutive equations of irradiation creep proposed by the present authors, the steady creep crack growth under un-irradiated, post-irradiation and under-irradiation conditions were analyzed. The effects of neutron irradiation and material non-linearity on creep crack velocity, the distribution of stress, strain and damage parameter in front of the crack tip were elucidated.
