A strength evaluation of carbon/metal joint for nuclear fusion reactors

Strength of carbon/metal joint materials used for next fusion facilities are influenced by stress concentration at joint interface, residual stresses and defects. In order to examine the fracture mechanics properties of the carbon/metal joint materials fracture toughness tests were performed. The result indicates that a crack in the joint originated from the carbon side and propagated. The fracture toughness value of the joint material was slightly longer than that of the carbon material. The result of hardness tests near the interface suggests existence of residual stresses. (author)