高温工学試験研究炉用等方性黒鉛の衝撃曲げ疲労特性

抄録

Repeated impact bending tests were carried out on isotropic nuclear graphites for HTTR. Each specimen whose length differed was centrally impacted by an instrumented pendulum. The simple one-dimensional model taking the Hertzian contact theory into consideration has been applied to evaluate the relationship between the maximum stress of the specimen generated by impact, the impact force and the impact energy. It has been confirmed that the endurance curves in terms of impact energy is dependent on the length of specimen but the one in terms of the evaluated maximum stress is independent of that, and the strength of graphite is lower in impact fatigue than in non-impact fatigue.