Required brittle crack arrest toughness Kca value with actual-scale model tests - Brittle crack arrest design for large container ships -4-
Required brittle crack arrest toughness Kca value with actual-scale model tests - Brittle crack arrest design for large container ships -4-
复制标题
实型模型试验要求的脆性止裂韧性Kca值-大型集装箱船脆性止裂设计-4-
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Tani
中科院分区：
文献类型：
--
作者：
Takehiro Inoue;Y. Yamaguchi;H. Yajima;S. Aihara;H. Yoshinari;K. Hirota;M. Toyoda;Takaaki Kiyosue;T. Handa;T. Kawabata;T. Tani
船体结构脆性断裂一旦发生，将造成严重的结构破坏、致命破坏和环境破坏。然而，如果偶然产生脆性裂纹，则提供备用脆性裂纹止裂功能以阻止其扩展并确保结构可靠性是非常重要的。在控制脆性裂纹起裂的基础上，引入脆性裂纹止裂概念，既防止脆性裂纹起裂，又防止脆性裂纹扩展，从而实现“双重完整”。对船舶用厚钢板的长裂纹止裂问题的研究表明脆性止裂性不足。一些特殊制造的TMCP钢具有足够的脆性裂纹止裂性，但尚未报道止裂长脆性裂纹的必要条件。Nippon Kaiji Kyokai （ClassNK）组织了一个由日本造船公司和钢铁制造商组成的研究委员会，进行了一个共同研究项目，以建立脆性裂纹止裂设计概念。为了弄清工程中脆性裂纹扩展的临界条件，对船舶用钢进行了实际模型试验。根据试验结果，提出了阻波设计所需的Kca值。这项研究是由ClassNK研究委员会进行的，研究结果已经总结并纳入了他们的“脆性裂纹止裂设计指南”。
Brittle fracture of hull structure causes serious structural, fatal and environmental damage once it happens. However, if by chance a brittle crack initiates, it is extremely important that a backup brittle crack arresting function is provided to arrest its propagation and to ensure structural reliability. The brittle crack arrest concept in addition to brittle crack initiation control makes it possible to achieve “double integrity” by preventing both brittle crack initiation and propagation. Studies on the long crack arrest issue of heavy-thick shipbuilding steels have reported insufficient brittle crack arrestability. Some specially manufactured TMCP steels have sufficient brittle crack arrestability, but the necessary conditions for arresting long brittle cracks have not been reported. Nippon Kaiji Kyokai (ClassNK) organized a research committee composed of Japanese shipbuilding companies and steel manufacturers to conduct a co-research project to establish a brittle crack arrest design concept. Actual-scale model tests using shipbuilding steels were conducted in order to clarify the critical conditions for brittle crack propagation in the project. The required Kca value for the arrest design was proposed based on the test results. This research has been conducted by the research committee of ClassNK, and the results have been summarized and incorporated in their “Guidelines on Brittle Crack Arrest Design.”