Fracture mechanics evaluation of a crack generated in SiC/SiC composite first wall

The finite element analysis was carried out for the blanket first wall made of SiC/SiC composite material for the future Tokamak fusion power reactor DREAM, which is conceptually designed in the Japan Atomic Energy Research Institute. Bending deflection and stress distribution were analyzed when the thermal expansion was constrained at the edge of the first wall. Preliminary fracture mechanics evaluation was carried out, assuming a crack in the first wall, by the finite element code ADINA. The result showed that it is necessary to find a new device for releasing thermal expansion in the design of the first wall. Effect of the fiber bridging on the crack arrest was studied in the first wall structure made of SiC/SiC composite material.