REACTOR IRRADIATION EFFECTS ON THE FATIGUE BEHAVIOR OF CTD-112P AT 77 K IN TENSION AND INTERLAMINAR SHEAR

摘要

CTD-112P, a two-dimensionally woven S2-glass-fiber reinforced epoxy, is a candidate turn insulation material for the the central solenoid (CS) model coil of ITER. Because of the pulsed operation of ITER, the fatigue behavior of the material has to be assessed under conditions including the appropriate radiation environment at the magnet location. In order to obtain information on the damage and fracture mechanisms after irradiation, the material was irradiated at ambient temperature in the TRIGA reactor (Vienna) to a fast neutron fiuence of 5x10~(21) m~(-2) (E>0.1 MeV). After measurements of swelling and weight loss caused by the irradiation, fatigue experiments on tensile and double lap shear specimens were carried out at 77 K. The results are discussed in comparison with those on the unirradiated materials. Fractographic investigations of the fracture surfaces by SEM are presented as well.