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现代舰船结构中使用高强材料以获得较高的性能水平,这就要求采用一种较好的可行的技术去处理可能遇到的问题。随着屈服强度的提高,断裂抗力迅速降低,这已是多年来人所共知的现象。近来,人们还清楚地认识到,屈服强度增加将使盐水应力腐蚀开裂(SCC),持久载荷开裂(SLC)和疲劳、腐蚀疲劳开裂的敏感性大大增加。那些裂纹生长属于不太敏感的材料,已被用于样机和舰队的关键部件;这些结构或其它结构长期使用的可靠性几乎完全决定于材料所固有的对裂纹生长的抗力。
The use of high-strength materials in modern ship structures for high levels of performance requires the use of a better, viable technology to deal with possible problems. As the yield strength increases, the fracture resistance rapidly decreases, which is a phenomenon well-known for many years. Recently, it has also been clearly recognized that an increase in yield strength will greatly increase the susceptibility to salt stress corrosion cracking (SCC), sustained load cracking (SLC) and fatigue, and corrosion fatigue cracking. Materials that are less sensitive to crack growth have been used in prototypes and fleet critical components; the reliability of long term use of these or other structures is almost entirely determined by the material’s inherent resistance to crack growth.