Thermal and irradiation induced stress analysis on relevant target plate structure of the divertor for fusion experimental reactors

This paper presents finite element analytical results of the thermal and ir radiation induced stresses occurred in the target plate of the divertor str uctures which are exposed to neutron irradiation at 0-1 dpa with high heat flux up to 15 MW/m(2). Three types of target plate models are studied in th e present work, e.g., flat plate, saddle and mono-block type models which h ave bonded structures of one-dimensional high thermal conductivity Carbon-C arbon (C/C) composite material and Oxygen-Free-High Conductivity Copper (OF HC). With these results, it is concluded that flat model exhibits the longe r life-time up to 1 dpa under 15 MW/m(2) whereas serious troubles, such as fracture in bonded interface or drop-off of armor tile from bonded substrat e, are expected in saddle and mono-block type models before 1 dpa. Design c hange with reduction of the volume of armor region in the model is also eff ective to prolong the life-time by the reduction of sublimation of armor ma terial.