Effect of Structural Discontinuities of Welded Joints on Brittle Crack Propagation Behavior : Brittle Crack Arrest Design for Large Container Ships-3 :

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Brittle fractures of hull structures cause serious structural, fatal and environmental damage once they happens. Therefore, ships are basically designed and constructed so that a brittle crack does not occur. Further, if by chance a brittle crack occurs, it is essentially and extremely important that a backup brittle crack arresting function is provided to arrest its propagation and to ensure structural reliability. Either fillet welding or partial penetration welding is applied in cruciform joints comprising the strength deck and hatch side coaming in which extremely thick steel plates are used. In this research, model experiments were conducted supposing that a brittle crack that has undergone linear propagation in a weld in the hatch coaming extend into a cruciform joint of the hatch side coaming and strength deck, and the effect of structural discontinuities on brittle crack propagation behavior in the cruciform joint was investigated assuming the case in which the lower edge of the butt welding of the hatch side coaming is melted to the deck plate. This research was conducted by a research committee of the Nippon Kaiji Kyokai (ClassNK), and the results were summarized and incorporated in their "Guidelines on Brittle Crack Arrest Design." (Nippon Kaiji Kyokai, 2009)

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