[1]周艳春,李爱群,方钊,等.Q345钢对接接头低周疲劳性能试验研究[J].东南大学学报(自然科学版),2017,47(4):738-742.[doi:10.3969/j.issn.1001-0505.2017.04.018]
 Zhou Yanchun,Li Aiqun,Fang Zhao,et al.Experimental study on low cycle fatigue properties of Q345 steel butt joint[J].Journal of Southeast University (Natural Science Edition),2017,47(4):738-742.[doi:10.3969/j.issn.1001-0505.2017.04.018]
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Q345钢对接接头低周疲劳性能试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
47
期数:
2017年第4期
页码:
738-742
栏目:
土木工程
出版日期:
2017-07-20

文章信息/Info

Title:
Experimental study on low cycle fatigue properties of Q345 steel butt joint
作者:
周艳春1李爱群12方钊1李万润13
1东南大学土木工程学院, 南京 210096; 2北京建筑大学北京未来城市设计高精尖创新中心, 北京 100044; 3兰州理工大学土木工程学院, 兰州 730050
Author(s):
Zhou Yanchun1 Li Aiqun12 Fang Zhao1 Li Wanrun13
1School of Civil Engineering, Southeast University, Nanjing 210096, China
2Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
3School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
关键词:
Q345 对接接头 焊缝 低周疲劳寿命 有限元分析
Keywords:
Q345 butt joint weld seam low cycle fatigue life finite element analysis
分类号:
TU318.1
DOI:
10.3969/j.issn.1001-0505.2017.04.018
摘要:
采用等幅轴向低周疲劳试验,通过疲劳寿命、循环应力-应变响应特征及应力-应变滞回曲线等指标研究了Q345钢对接接头的疲劳性能,观察了疲劳断口宏观特征,并在试验研究和有限元分析的基础上,建立了该焊缝材料的疲劳寿命预测公式.结果表明:焊缝材料初始阶段表现为明显循环硬化现象,后期为轻微循环软化,总体上提高了材料的强度及疲劳性能;随着轴向位移的增加,应力幅增大,循环硬化率线性减小;滞回曲线光滑、饱满,材料耗能能力稳定;疲劳断口可明显划分为裂纹源区、裂纹扩展区和裂纹瞬断区,为典型疲劳破坏断口.得到的疲劳寿命预测公式对实际工程中Q345钢结构的疲劳分析和寿命预测具有重要意义.
Abstract:
By constant amplitude axial low cycle fatigue tests, the fatigue performance of butt weld joints made of Q345 was studied in terms of fatigue life, cyclic stress-strain response characteristics and stress-strain hysteresis loops, and the macro-characteristics of the fracture section were examined. Based on the fatigue test data and finite element analysis, the fatigue life prediction equation of the weld material was derived. The results show that the initial stage of the weld material is characterized by obvious cyclic hardening phenomenon, and the latter stage is slight cyclic softening. As a whole,the material strength and fatigue properties are improved. With the increase of the axial displacement, the stress amplitude increases and the cyclic hardening rate linearly decreases. The hysteresis loop is smooth and full, and the energy dissipation capacity of the material is stable. The fatigue fracture section is divided into crack source zone, crack propagation zone and crack transient fracture zone, and thus it is a typical fatigue fracture section. The obtained fatigue life prediction equation can provide important reference for the fatigue analysis and life evaluation of steel structures made of Q345.

参考文献/References:

[1] 李杰. 地震循环载荷下钢结构梁柱焊接节点耗能与损伤行为的研究[D]. 天津:天津大学材料科学与工程学院, 2002.
[2] Popov E P, Yang T S, Chang S P. Design of steel MRF connections before and after 1994 Northridge earthquake[J]. Engineering Structures, 1998, 20(12):1030-1038. DOI:10.1016/s0141-0296(97)00200-9.
[3] Miller D K. Lessons learned from the Northridge earthquake[J]. Engineering Structures, 1998, 20(4): 249-260. DOI:10.1016/s0141-0296(97)00031-x.
[4] 雷宏刚, 付强, 刘晓娟. 中国钢结构疲劳研究领域的30年进展[J]. 建筑结构学报, 2010(S1):84-91.
  Lei Honggang, Fu Qiang, Liu Xiaojuan. Research progress of steel structure fatigue in past 30 years in China[J]. Journal of Building Structures, 2010(S1):84-91.(in Chinese)
[5] Pu Y M, Wang L, Wu J C. The overall anti-seismic properties of Q235B and Q345BH H-beams[J]. Anhui Metallurgy, 2005, 4:1-5.
[6] 罗云蓉, 王清远, 刘永杰, 等. Q235、Q345钢结构材料的低周疲劳性能[J]. 四川大学学报(工程科学版), 2012,44(2):169-175.
  Luo Yunrong, Wang Qingyuan, Liu Yongjie, et al. Low cycle fatigue properties of steel structure materials Q235 and Q345[J]. Journal of Sichuan University(Engineering Science), 2012, 44(2):169-175.(in Chinese)
[7] 崔仕明, 王睿东, 游翔, 等. Q345低周疲劳性能与疲劳寿命预测分析[J]. 实验力学, 2014, 29(5): 537-542. DOI:10.7520/1001-4888-13-206.
Cui Shiming, Wang Ruidong, You Xiang, et al. On the low cycle fatigue behavior and fatigue life prediction of Q345 steel[J]. Journal of Experimental Mechanics, 2014, 29(5): 537-542. DOI:10.7520/1001-4888-13-206. (in Chinese)
[8] 周立威, 王海光. Q345级钢结构的疲劳寿命评价方法研究[J]. 宽厚板, 2015, 21(1): 40-42. DOI:10.3969/j.issn.1009-7864.2015.01.010.
Zhou Liwei, Wang Haiguang. Fatigue life evaluation method of Q345 steel structure[J]. Wide and Heavy Plate, 2015, 21(1): 40-42. DOI:10.3969/j.issn.1009-7864.2015.01.010. (in Chinese)
[9] 姚卫星. 结构疲劳寿命分析[M]. 北京: 国防工业出版社, 2003:127-139.
[10] Smith K N, Topper T H, Watson P. A stress-strain function for the fatigue of metals(stress-strain function for metal fatigue including mean stress effect)[J]. Journal of Materials, 1970, 5(4):767-778.
[11] Coffin L F J. A study of the effects of cyclic thermal stresses on a ductile metal[J]. Ryūmachi, 1953, 22(6):419-606.

备注/Memo

备注/Memo:
收稿日期: 2017-01-16.
作者简介: 周艳春(1990—),女,硕士生;李爱群(联系人),男,博士,教授,博士生导师,aiqunli@seu.edu.cn.
基金项目: 国家自然科学基金重点资助项目(51438002)、国家自然科学基金资助项目(51278104)、中国博士后科学基金资助项目(2015M571641).
引用本文: 周艳春,李爱群,方钊,等.Q345钢对接接头低周疲劳性能试验研究[J].东南大学学报(自然科学版),2017,47(4):738-742. DOI:10.3969/j.issn.1001-0505.2017.04.018.
更新日期/Last Update: 2017-07-20