高强度钢材及其焊缝脆性断裂与疲劳性能的研究进展  

Progress in the Brittle Fracture and Fatigue of High Strength Steels and Their Welds

作　　者：王元清[1] 林云[2] 周晖[1] 张延年[2] 石永久[1] 

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《建筑钢结构进展》2012年第5期21-28,共8页Progress in Steel Building Structures

基　　金：国家自然科学基金(51178244;50778102)

摘　　要：简单阐述了高强度钢材的优、缺点以及在国内外建筑工程和桥梁工程中的应用情况,并分析了其实际工程中存在的若干问题。总结了国内外对高强度钢材及其焊缝的脆性断裂与疲劳破坏的相关研究,引出研究高强度建筑用结构钢材及其连接焊缝的断裂韧性和疲劳性能以及影响因素变化规律的必要性,得出了如下结论:低温、焊缝缺陷、钢材厚度的增加和高频动荷载极大降低了高强度钢材的抗脆断能力及疲劳寿命;同时高强度钢材由于特殊冶金工艺而具有的力学性能和韧性加上这些外因限制了其使用范围。The advantages and disadvantages of high strength steel as well as its application in the domestic and foreign construction engineering and bridge engineering were briefly described , as well as a number of practical engineering problems analyzed.Summing up the related research of domestic and foreign high strength steels and their welds on their brittle fracture and fatigue , the article raised the need for study on the fracture toughness and fatigue performance of high strength steel used in construction and its connection weld and the change law of influence factor. Low temperature , weld defects , increasing thickness of steel and high-frequency dynamic load were found greatly reducing the resistance capacity of brittle fracture of high strength steel and fatigue life ; Other than these external factors , for mechanical properties and toughness due to special metallurgical processes , the application of high strength steel was limited.

关 键 词：高强度钢材 低温冷脆 脆性断裂 疲劳性能 

分 类 号：TU511.3[建筑科学—建筑技术科学]