建筑用抗震钢HRB400EⅢ级钢筋焊接接头的低周疲劳性能
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摘要
采用轴向应变控制方法,在MTS809拉扭复合疲劳试验机上开展了HRB400EⅢ级钢筋母材及焊接接头的低周疲劳试验,获得了母材及焊接接头的低周疲劳性能,如循环应力响应特征、循环应力-应变关系以及寿命预测公式等。通过断口电镜扫描发现,HRB400EⅢ级钢筋焊接接头的裂纹萌生于试件表面,且存在多处裂纹源。研究结果表明,焊接接头与母材的低周疲劳寿命及微观断裂机理方面均存在明显差异,并从力学性能变化的角度对引起差异的原因进行了解释。
The low cycle fatigue( LCF) behavior of the welded joint of the HRB400EⅢ aseismic reinforced bars promoted in the earthquake areas in China was investigated. The LCF tests under uniaxial strain control were carried out on a MTS809 servo-hydraulic testing machine. The low cycle fatigue properties,such as the cyclic stress response characteristics,the cyclic stress-strain relationships and the fatigue life prediction models of the base metal and the welded joint were obtained. The Coffin-Manson parameters were derived from the test results. The SEM micrographs revealed that more than one fatigue cracks initiated at the specimen surfaces. The results showed that the low cycle fatigue life and the micro fracture mechanism of the welded joint are obviously different from those of the base metal. The reasons for the obvious difference of the LCF property and the micro fracture mechanism of the welded joint were also revealed from the change of the mechanical properties.
The low cycle fatigue( LCF) behavior of the welded joint of the HRB400EⅢ aseismic reinforced bars promoted in the earthquake areas in China was investigated. The LCF tests under uniaxial strain control were carried out on a MTS809 servo-hydraulic testing machine. The low cycle fatigue properties,such as the cyclic stress response characteristics,the cyclic stress-strain relationships and the fatigue life prediction models of the base metal and the welded joint were obtained. The Coffin-Manson parameters were derived from the test results. The SEM micrographs revealed that more than one fatigue cracks initiated at the specimen surfaces. The results showed that the low cycle fatigue life and the micro fracture mechanism of the welded joint are obviously different from those of the base metal. The reasons for the obvious difference of the LCF property and the micro fracture mechanism of the welded joint were also revealed from the change of the mechanical properties.
引文
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[20]Luo Yunrong,Wang Qingyuan,Fu Lei,et al.Experimental study on the effect of extensometer knife edges on the low cycle fatigue data[J].China Science Paper,2013,8(5):445-448.[罗云蓉,王清远,付磊,等.引伸计刀口对低周疲劳数据影响的试验研究[J].中国科技论文,2013,8(5):445-448.]
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[23]Mahobia G S,Paulose N,Mannan S L,et al.Effect of hot corrosion on low cycle fatigue behavior superalloy IN718[J].International Journal of Fatigue,2014,59:272-281.
[2]Zhao Yunlin.Analysis of the anti-earthquake consolidating technology to brick structure buildings after the Earthquake on 5.12,2008[J].Journal of Sichuan University of Science&Engineering:Natural Science Edition,2011,24(2):129-132.[赵蕴林.5.12大地震后砖混结构房屋抗震加固技术探讨[J].四川理工学院学报:自然科学版,2011,24(2):129-132.]
[3]Gong Shihong,Sheng Guangming.The views on materials in“reinforced concrete structure in anti-seismic design”[J].The Standardization of Engineering Construction,1996(1):6-9.[龚士弘,盛光敏.对“钢筋混凝土结构构件抗震设计”材料部分的意见[J].工程建设标准化,1996(1):6-9.]
[4]Luo Yunrong,Wang Qingyuan,Liu Yongjie,et al.Low cycle fatigue properties of steel structure materials Q235and Q345[J].Journal of Sichuan University:Engineering Science Edition,2012,44(2):169-176.[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.]
[5]Gong Shihong,Sheng Guangming.Effects of toughness of steel on seismic performance of building structures[J].Earthquake Resistant Engineering,2004(3):41-47.[龚士弘,盛光敏.地震区建筑用钢的韧性对建筑物抗震性能的影响[J].工程抗震,2004(3):41-47.]
[6]Gong Shihong,Xin Yide.Problem of aseismic properties of building structure steel in earthquake areas[J].Earthquake Resistant Engineering,1987(3):31-35.[龚士弘,辛义德.地震区建筑结构钢的抗震性能问题[J].工程抗震,1987(3):31-35.]
[7]Zhan Suyu,Sheng Guangmin,Liu Xudong,et al.Study on high strain low cycle fatigue properties of HRB400E reinforced steel bars[J].Material Heat Treatment,2010,39(16):22-26.[詹苏宇,盛光敏,刘旭东,等.高强HRB400E建筑用抗震钢筋高应变低周疲劳性能研究[J].材料热处理技术,2010,39(16):22-26.]
[8]Luo Y R,Zeng T,Fu L.Investigation on the influence of fatigue damage on the mechanics property of anti-seismic steel HRB400E reinforcing steel bars[J].Applied Mechanics and Materials,2013,368:1678-1682.
[9]Luo Yunrong,Wang Qingyuan.Advances in research on high strain low cycle fatigue(LCF)and extremely low cycle fatigue(ELCF)properties of anti-seismic building steel[J].Sichuan Building Science Resreach,2011,37(3):139-145.[罗云蓉,王清远.建筑用抗震钢高应变低周及超低周疲劳性能研究进展[J].四川建筑科学研究,2011,37(3):139-145.]
[10]Ferreiraa J,Castiglionib C A,Caladoa L,et al.Low cycle fatigue strength assessment of cruciform welded joints[J].Journal of Constructional Steel Research,1998,47(3):223-244.
[11]Seto A,Masuda T,Machida S,et al.Very low cyclic fatigue properties of butt welded joints containing weld defects[J].Quarterly Journal of the Japan Welding Society,1999,17(1):130-138.
[12]Hanji T,Tateishi K,Minami K,et al.Extremely low cycle fatigue assessment for welded joints based on peak strain approach[J].Journal of Structural Mechanics and Earthquake Engineering,2006,74(808):137-145.
[13]Tateishi K,Hanji T.Low cycle fatigue strength of butt welded steel joint by means of new testing system with image technique[J].International Journal of Fatigue,2004,26(12):1349-1356.
[14]Czechowski M.Low-cycle fatigue of friction stir welded Al-Mg alloys[J].Journal of Materials Processing Technology,2005,164:1001-1006.
[15]He Guoqiu,Chen chengshu.Research on the low cycle fatigue of stainless steel under multi-axial non proportional loading[J].Chinese Journal of Mechanical Engineering,1999,35(1):47-50.[何国求,陈成澍.不锈钢多轴非比例加载低周疲劳的研究[J].机械工程学报,1999,35(1):47-50.]
[16]Shi Yaowu,Shi Xuan.Investigation on the low-cycle fatigue performance of welding Joint of construction machinery 800 MPa-grade low alloy high strength steel[J].Ordnance Material Science and Engineering,2011,34(1):24-27.[史耀武,史轩.工程机械用800MPa低合金高强度钢焊接接头低周疲劳性能研究[J].兵器材料科学与工程,2011,34(1):24-27.]
[17]Cheng Guangxu,Low Zhiwen.Low cycle fatigue performance of welding joint of 16MnR steel and its application in the fatigue life design of the pressure vessels[J].Pressure Vessel,1991,8(6):17-23.[程光旭,楼志文.16MnR钢焊接接头低周疲劳特性及其在压力容器疲劳寿命设计中的应用[J].压力容器,1991,8(6):17-23.]
[18]Chen Xu,Zhao Zhifang.Low cycle fatigue performance of welding joint of 16MnR steel[J].Chemical Production and Technology,2000,7(3):10-11.[陈旭,赵志芳.16MnR钢焊接接头低周疲劳性能[J].化工生产与技术,2000,7(3):10-11.]
[19]Du Junjie.A study on rachetting and fatigue performance of 16MnR steel and its welding joint[D].Tianjin:Tianjin University,2007.[杜俊杰.16MnR及其焊接接头棘轮效应与疲劳性能研究[D].天津:天津大学.2007.]
[20]Luo Yunrong,Wang Qingyuan,Fu Lei,et al.Experimental study on the effect of extensometer knife edges on the low cycle fatigue data[J].China Science Paper,2013,8(5):445-448.[罗云蓉,王清远,付磊,等.引伸计刀口对低周疲劳数据影响的试验研究[J].中国科技论文,2013,8(5):445-448.]
[21]陈传尧.疲劳与断裂[M].武汉:华中科技大学出版社,2002.
[22]Luo Y R,Huang C X,Guo Y,et al.Energy-based prediction of low cycle fatigue life of high-strength structural steel[J].Journal of Iron and Steel Research International,2012,19(10):47-53.
[23]Mahobia G S,Paulose N,Mannan S L,et al.Effect of hot corrosion on low cycle fatigue behavior superalloy IN718[J].International Journal of Fatigue,2014,59:272-281.
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