Long Crack Arrestability Of Heavy-Thick Shipbuilding Steels
Long Crack Arrestability Of Heavy-Thick Shipbuilding Steels
复制标题
厚厚造船钢的长裂纹止裂性能
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
H. Yajima
中科院分区：
文献类型：
--
作者：
Takehiro Inoue;T. Ishikawa;S. Imai;T. Koseki;K. Hirota;M. Tada;H. Kitada;Y. Yamaguchi;H. Yajima
结构钢的脆性裂纹扩展稳定性对大型结构的完整性和防止重大事故的发生至关重要。EH级造船用钢被期望具有基板和焊接接头中的脆性裂纹的长裂纹稳定性。为了研究厚钢板的长裂纹止裂稳定性，进行了几次大尺寸的试验，试验板厚度大于或等于65mm。焊接接头采用大热输入焊接。所有基板及其焊接接头均满足船级社规范中对EH级板和焊接接头的CVN韧性要求。在大于200 MPa的应力下，即使有纵向加劲肋穿过试验焊缝，也会出现沿着焊接接头延伸并贯穿试验板的脆性裂纹。另一方面，只有当一个试验板的纵向加劲肋加载应力低于200 MPa时，沿焊接接头的脆性裂纹沿着停止。此外，在应力高于200 MPa时，纵向加劲肋底板模型中的脆性裂纹没有被阻止。这些结果表明，EH级钢板及其焊接接头并不总是具有长裂纹扩展稳定性。需要进一步的研究来阐明厚钢板的长裂纹扩展稳定性。
Brittle crack arrestability of structural steels is essentially important for the integrity of large structures to prevent fatal accidents. EH-grade shipbuilding steels have been expected to have the long crack arrestability of a brittle crack in a base plate and a welded joint. Several large-scale crack arrest tests have been carried out in order to investigate the long crack arrestability of heavy-thick ship building steels, where test plate thicknesses were larger than or equal to 65mm. High heat input welding was used for the welded joint. All base plates and their welded joints satisfied CVN toughness requirements for EH-gradc plates and welded joints in ship classification societies rules. A brittle crack ran along a welded joint and penetrated through the test plate under stress higher than 200MPa even though the longitudinal stiffeners across the test weld existed. On the other hand, a brittle crack along the welded joint arrested only when a test plate with longitudinal stiffeners was loaded under stress lower than 200MPa. In addition, a brittle crack in a base plate model with longitudinal stiffeners was not arrested under stress higher than 200MPa. These results suggest that EH-grade steel plates and their welded joints do not always have long crack arrestability. Further investigation will be needed to clarify the long crack arrestability of heavy thick steel.