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| Q345桥梁钢焊接接头超高周疲劳性能 | |
| 引用本文： | 方冬慧,刘永杰,陈宜言,王清远.Q345桥梁钢焊接接头超高周疲劳性能[J].焊接学报,2011,32(8):77-80. |
| 作者姓名： | 方冬慧 刘永杰 陈宜言 王清远 |
| 作者单位： | 1. 四川大学锦城学院土建系,成都,610065 2. 四川大学力学科学与工程系,成都,610065 3. 深圳市政工程设计研究院,深圳,518029 |
| 基金项目： | 国家自然科学基金资助项目 |
| 摘 要： | 采用超声疲劳振动技术研究了桥梁钢Q345qC的母材和圆形对接焊接接头试件的高周与超高周疲劳性能.试验发现,在105～109循环周次内焊接接头的疲劳性能远低于母材,且无论是母材还是焊接接头其S-N曲线都是呈连续下降趋势.当母材服役超过107周次,焊接接头服役超过5×106周次以后,试件仍然发生疲劳断裂.结果表明,焊接接头... |
| 关 键 词： | 超高周疲劳 焊接接头 超声疲劳振动技术 应力-寿命曲线 断口特征 |
| 收稿时间： | 2010/5/15 0:00:00 |
Ultra-high cycle fatigue behaviors of Q345 bridge steel welded joint |
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| FANG Donghui,LIU Yongjie,CHEN Yiyan and WANG Qingyuan.Ultra-high cycle fatigue behaviors of Q345 bridge steel welded joint[J].Transactions of The China Welding Institution,2011,32(8):77-80. | |
| Authors: | FANG Donghui LIU Yongjie CHEN Yiyan and WANG Qingyuan |
| Affiliation: | Department of Civil Engineering & Architecture, College of Jincheng, Sichuan University, Chengdu 610065, China,Department of Mechanics and Engineering Science, Sichuan University, Chengdu 610065, China,Shenzhen Municipal Design & Research Institute, Shenzhen 518029, China and Department of Mechanics and Engineering Science, Sichuan University, Chengdu 610065, China |
| Abstract: | The high cycle and ultra-high cycle fatigue properties of Q345qC base metal and circular butt weld joint were studied by using the ultrasonic fatigue testing technique. The experimental results show that during 105-109 cycles, the fatigue strength of welded joint is much less than that of base metal, and both their S-N curves descend continuously. Fracture can still occur on base metal beyond 107 cycles and on welded steel beyond 5×106 cycles. The observation of fracture surface shows cracks mainly initiate from welded toes at fusion area or geometric discontinuity at the surface in welded steel. Furthermore, fatigue failure occurs at the geometric discontinuity area in the high stress regime but occurs at welded toes in the low stress regime. |
| Keywords: | ultra-high cycle fatigue welded joint ultrasonic fatigue test S-N curve fracture surface |
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