湿热周浸环境下高强钢对接焊缝的疲劳性能  

Fatigue Performance of Butt Welds of High Strength Steel under the Humid and Hot Immersion Environment

作　　者：郭宏超[1,2] 蔡欣悦 李国强 王彦博[2] 刘云贺[1] GUO Hongchao;CAI Xinyue;LI Guoqiang;WANG Yanbo;LIU Yunhe(School of Civil Engineering and Architecture,Xi´an University of Technology,Xi´an 710048,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]同济大学土木工程学院,上海200092

出　　处：《建筑材料学报》2022年第8期823-829,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51978571);陕西省杰出青年科学基金资助项目(2021JC-41);陕西省重点研发计划项目(2022SF-199)。

摘　　要：通过湿热周浸模拟海洋浪溅区腐蚀环境,对Q690高强钢对接焊缝开展了疲劳性能试验,分析了腐蚀损伤与焊缝缺陷对其疲劳性能的影响.结果表明:Q690高强钢对接焊缝具有良好的抗疲劳能力,当腐蚀时间为100 d时,试件质量损失率为8.46%,焊缝区和热影响区的平均腐蚀速率分别为1.14、1.22 mm/a,疲劳极限减小了32.7%;锈蚀试件断口裂纹分布呈平行条带状,且随着腐蚀损伤程度的增大,在高应力水平下的疲劳条纹数量减少,损伤累积明显提高.Fatigue test of butt welds of Q690 high strength steel was carried out by simulating the corrosion environment in the splash zone through humid and hot immersion environment.The effects of corrosion damage and weld defects on its fatigue properties of high strength steel were analyzed.The results show that the butt welds of Q690 high strength steel has good fatigue resistance.When the corrosion period is 100 days,the mass loss rate of the specimen is 8.46%,the average corrosion rate of the weld zone and the heat affected zone was 1.14 and 1.22 mm/a,and the fatigue limit is reduced by 32.7%.The fracture crack distribution of the rusted specimen crack is in parallel banded.With the increase of corrosion damage degree,the number of fatigue stripes under high stress level decreases and the damage accumulation increases significantly.

关 键 词：Q690高强钢 对接焊缝 海洋浪溅区 腐蚀疲劳 损伤指数 

分 类 号：TU391[建筑科学—结构工程]