Nippon Kaiji Kyokai (ClassNK) announced the publication of a new document “Guidelines on Brittle Crack Arrest Design”. These guidelines have been released as a technical reference to help prevent the propagation of brittle cracks that may occur in the hull structure and possibly threaten the safety of a ship through structural rupture or other catastrophic damage.
In order to ensure the safety of a ship, it is essential that effective measures be taken to ensure that brittle cracks, which may lead to breakage of the hull do not occur. At the same time, it is also vitally important to adopt measures to arrest the propagation of brittle cracks in the event of such cracks occurring.
ClassNK established a research committee on brittle crack arrest design together with shipbuilders, steel manufacturers, universities, and research institutes in 2007. The committee studied and investigated the propagation behavior of brittle cracks and the technical measures that would be necessary to prevent their propagation with respect to the extremely thick steel plates used in the construction of very large containerships. These efforts also included large-scale model tests and advanced computer analysis of brittle crack arrest designs.The guidelines are available for downloading from the ClassNK
ClassNK is currently proceeding with further research and development aimed at enhancing the structural integrity of large and ultra large container carriers as part of its ongoing efforts to achieve greater safety and reduced environmental loads at sea.
The guidelines are available for downloading from the ClassNK website.