Abstract
Fracture toughness such as CTOD or Kca is applied to steel plates of the thickness used in actual constructions. On the other hand, K1c or K1a is to plates in the plane strain condition. Plate thickness dependence of the former stated in the standard of The Japan Welding Engineering Society (WES 3003) and High Pressure Institute of Japan (HIPS B102) is compared with that of the latter. Dependence of CTOD on plate thickness is fairly well compared to that of K1c, when expressed in terms of the shift in the transition temperature. K1a does not depend on plate thickness whereas Kca shows the clear dependence on plate thickness, which is explained by a naive model taking into account the effect of side ligaments.
