ClassNK investigates brittle crack arrest design

19 Feb 2015
Establihsing brittle crack arrest properties for thicker steel will be particularly important for ship areas under high stress

Establihsing brittle crack arrest properties for thicker steel will be particularly important for ship areas under high stress

ClassNK is to carry out joint research into preventing brittle fractures, aimed at improving safety standards for ultra-large container ships.

The IACS Unified Requirements for Use of Extremely Thick Steel Plates released in January 2013 only govern the crack arrest properties of steel up to 80mm thick. Parameters for thicker steel must be agreed with classification societies.

ClassNK noted: “With the introduction of 20,000 teu ultra-large container ships, the increased use of brittle crack arrest steel exceeding 80mm in thickness is expected. To ensure smooth adoption of thicker steel in the industry, ClassNK has embarked on a joint research project to develop technical standards in order to clarify the crack arrest parameter for steel plates exceeding 80mm in thickness.”

The society said it hopes its research will contribute to a proposal for unified IACS requirements for brittle crack arrest steel exceeding 80mm. The project will be carried out in collaboration with the Japanese Welding Engineering Society (JWES), steel manufacturers, shipbuilders, and neutral research institutes, and is scheduled to be completed in mid-2016.

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