SB-01-2(065) Thermal fatigue experiment of the CuCrZr divertor mock-ups(Materials Performance in Nuclear Application 1)

概要

論文の詳細を見る
Estimation of the lifetime of the divertor plate is one of the very important issues for the ITER design. In our previous thermal fatigue test, one of the divertor mock-ups showed low cycle thermal fatigue fracture due to large strain concentration of the cooling tube. To make clear thermal fatigue behavior of this strain concentration, new mock-ups were fabricated and tested in JAERI. Thermal fatigue experiments were performed under the cyclic heat flux of 20 MW/m^2 to simulate the ITER operational condition. A water leakage due to thermal fatigue cracking of the cooling tube occurred after 2400 cycles. It was observed at the interface between the top of the cooling tube and the heat sink where the strain concentration appeared in the numerical analysis. The maximum strain amplitude of this position was about 10 % in the numerical analysis. Based on this result, the fatigue lifetime can be estimated as 300 cycles by use of Manson-Coffin's law, which is one eighth of the experimental lifetime.
一般社団法人日本機械学会の論文
2001-06-03