Abstract
Abstract The graphite components in an HTR (high-temperature gas-cooled reactor) are subjected to impact forces due to earthquake. It is important from the viewpoint of seismic safety design to investigate the difference of strength under impact loading and nonimpact loading. Both bending strength and bending fatigue strength tests, therefore, were carried out under impact and nonimpact loading on two kinds of graphite materials: isotropic and near-isotropic. The impact response analyses, which used a beam model taking account of the contact behavior between specimen and tup, were performed to evaluate the relationships between impact energy, impact force and stress. The main conclusions obtained are summarized as follows: 1. (1) A beam model taking account of the contact behavior through the Hertzian theory is applicable to describe the impact behavior. 2. (2) The bending strength of graphite is independent of strain rate in the range from 10 −6 to 5/s. 3. (3) The bending fatigue strength of graphite is lower under impact loading than under non-impact, independent of the specimen volume and type of graphite.
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