Ultimate purpose of the fracture management and control for ship structure design are “to achieve zero serious accident”, that is, “to avoid ship sinking”. Especially, for the structure design of large ships, how the crack arrest structure (crack arrestor) is applied to is most important. By the way, the ship capacity as in container ship is growing year and year, and in the recent decade ultra-large container ships of 20,000 TEU class have been developed and built. Therefore, the crack arrestor becomes important more and more.
In this study, based on the past serious accidents of the hull structure for up to newly developed very large container ship from general cargo ship in World War II, we considered and discussed the required brittle crack arrest toughness of structural steel plates for the hull structure design of these ships.
Finally, we discussed the required brittle crack arrest toughness value Kca for the very thick welded steel plates for 20,000 TEU class container ships are being built recently.
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