Brittle crack propagation/arrest behavior in T-joint structure of heavy gauge steel plate
Brittle crack propagation/arrest behavior in T-joint structure of heavy gauge steel plate
复制标题
大规格钢板T型接头结构脆性裂纹扩展/止住行为
DOI：
10.1007/s40194-015-0242-3
复制
发表时间：
2015
影响因子：
2.1
通讯作者：
F. Minami
中科院分区：
文献类型：
--
作者：
T. Handa;S. Igi;K. Oi;T. Tagawa;F. Minami
脆性裂纹止裂性对于大型集装箱船用大规格钢板的焊接接头极为重要。最近，人们广泛关注沿着大热输入焊接制造的焊缝潜在的裂纹扩展。本文研究了 T 型接头在集装箱船强度甲板结构中的应用，以增强止裂性能。未焊接面和止裂韧性 Kca 各不相同。对于具有未焊接面的 T 型接头，T 型接头部件的 ESSO 测试表明，脆性裂纹在嵌入未焊接面的 T 型接头处停止。在全熔透 T 形接头的情况下，如果用于法兰的钢板具有 4900 至 7300 N/mm3/2 范围内的高 Kca 值，则脆性裂纹会被抑制。应力强度因子K的有限元分析表明，当裂纹尖端处的K值小于材料的Kca时，脆性裂纹扩展被阻止。在T型接头中，当脆性裂纹侵入法兰板时，裂纹最深点周围的K值下降，最终小于法兰板的Kca。这一现象显示了采用T型接头对强度甲板结构翼缘板进行脆性裂纹止裂的优势。为了验证T型接头结构的长脆性止裂性能，在动态有限元分析得出的推荐条件下进行了超大型试验。测试结果表明，长脆性裂纹可以在上述T形接头结构处停止。
Brittle crack arrestability is extremely important in welded joints of heavy gauge steel plates used in large container ships. Recently, much attention has been focused on potential crack propagation along welds fabricated by large heat input welding. This paper examines the application of a T-joint to the strength deck structure of container ships to enhance crack arrestability. The unwelded face and the crack arrest toughness, Kca, for crack arrest were varied. In the case of a T-joint with an unwelded face, the ESSO test of the T-joint components showed that a brittle crack arrested at the T-joint embedding the unwelded face. In the case of a full penetration T-joint, the brittle crack was arrested if the steel plate used for the flange had a high Kca value in the range from 4900 to 7300 N/mm3/2. FEM analysis of the stress intensity factor K indicated that brittle crack propagation was arrested under the condition that the K value at the running crack tip was less than the Kca of the material. In the T-joint, it was noted that the K value around the deepest point of the crack decreased and was finally less than the Kca of the flange plate when the brittle crack penetrated into the flange plate. This phenomenon shows the advantage of using a T-joint for brittle crack arrest in the flange plates of strength deck structures.In order to verify the long brittle crack arrestability of the T-joint structure, ultra-large-scale tests were carried out under the recommended conditions obtained from a dynamic FEM analysis. The test results showed that long brittle cracks could arrest at the aforementioned T-joint structures.
焊接结构脆性裂纹扩展的抑制分析
DOI：
--
发表时间：
2008
期刊：
Proceedings of International Symposium on Structures under Earthquake, Impact, and Blast Loading 2008
影响因子：
--
作者：
H. Serizawa;A. Kawahara;S. Itoh and H. Murakawa;H. Murakawa and H. Serizawa
通讯作者：
H. Murakawa and H. Serizawa