焊接对热轧H型钢高应变低周疲劳行为的影响
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摘要
对热轧H型钢热轧和焊接后的高应变低周疲劳循环应力响应曲线、循环应力-应变关系和应变-寿命关系进行了分析,通过Coffin-Manson公式得到疲劳寿命计算公式,计算出Nf=100周时的循环韧度值σa.Δεt。结果表明,H型钢焊接试样的循环韧度比热轧试样的循环韧度降低38%。热轧试样表现出明显的循环稳定特性,焊接试样表现出循环软化-直接断裂的应力响应特征。焊接试样的断口扫描电镜观察发现,疲劳裂纹在焊接接头的粗晶区表面处萌生,断口瞬断区具有明显的韧窝特征,表明材料焊接后保持较高的韧性。
Low cycle fatigue(LCF)properties of H-beam as hot-rolled and welded are studied,and the cyclic stress-strain relationship and cyclic response characterization are determined.Based on the Coffin-Manson formula,the strain-fatigue life relationship is obtained.Finally,the cyclic toughness,which is the product of strain range at LCF life of 100 cycles and the stress amplitude,are calculated.The test results show that the cyclic toughness as welded H-beam is 62% of that as hot-rolled.Hot-rolled materials exhibit cyclic stability,and welded materials show cyclic softening followed by fracture.The scanning electron microscope(SEM) micrograph of fracture surfaces reveals that the fatigue crack initiates from the coarse grain area of welding joint,and the fine dimple is observed in the fracture surface,which indicates the welding joint remains a good ductility.
Low cycle fatigue(LCF)properties of H-beam as hot-rolled and welded are studied,and the cyclic stress-strain relationship and cyclic response characterization are determined.Based on the Coffin-Manson formula,the strain-fatigue life relationship is obtained.Finally,the cyclic toughness,which is the product of strain range at LCF life of 100 cycles and the stress amplitude,are calculated.The test results show that the cyclic toughness as welded H-beam is 62% of that as hot-rolled.Hot-rolled materials exhibit cyclic stability,and welded materials show cyclic softening followed by fracture.The scanning electron microscope(SEM) micrograph of fracture surfaces reveals that the fatigue crack initiates from the coarse grain area of welding joint,and the fine dimple is observed in the fracture surface,which indicates the welding joint remains a good ductility.
引文
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[3]APOSTOLOPOULOS C A,MICHALOPOULOS D.Corrosion of reinforcing steel and low cycle fatiguebehaviour[J].Materials andCorrosion,2007,58(6):438-446.
[4]KIM K S,KIM B O,KIM Y K,et al.A study on thelow cycle fatigue behavior of the steel for shipbuildingindustry[J].Key Engineering Materials,2005,297-300:10-15.
[5]BROWN J,KUNNATH S K.Low-cycle fatigue failureof reinforcing steel bars[J].Acimaterials Journal,2004,101(6):457-466.
[6]龚士弘,盛光敏.抗震设计用钢探讨[J].工程抗震,1995(2):4-5.GONG SHI-HONG,SHENG GUANG-MIN.Exploreaseismatic design with steel[J].Engineering Anti-seismic,1995(2):4-5.
[7]龚士弘,盛光敏.对“钢筋混凝土结构构件抗震设计”(GBJ10-89)材料部分的意见[J].工程建设标准化,1996(1):44-48.GONG SHI-HONG,SHENG GUANG-MIN.Somesuggestion for reinforced concrete structures,"SeismicDesign"(GBJ10-89)material part[J].EngineeringConstruction Standardization,1996(1):44-48.
[8]NIP K H,GARDNER L,DAVIES C M,et al.Extremely low cycle fatigue tests on structural carbonsteel and stainless steel[J].Journal of ConstructionalSteel Research,2010,66(1):96-110.
[9]YANG X.Low cycle fatigue and cyclic stress ratchetingfailure behavior of carbon steel 45 under uniaxialcyclicloading[J].International Journal of Fatigue,2005,27(5):1124-1132.
[10]苗张木,吴卫国,李书学,等.港深西部通道钢箱梁低温CTOD试验[J].钢结构,2005,20(3):35-38.MIAO ZHANG-MU,WU WEI-GUO,LI SHU-XUE,et al.The channel steel temperature CTOD test[J].Steel Structure,2005,20(3):35-38.
[11]苗张木,陶德馨,吴卫国,等.裂纹尖端张开位移试验在导管架建造中的应用[J].武汉理工大学学报:交通科学与工程版,2006,30(2):29-33.MIAO ZHANG-MU,TAO DE-XIN,WU WEI-GUO,et al.The crack tip opening displacement experiment onthe jacket to build applications[J].Wuhan Universityof Science and Technology Journal:Traffic Science andEngineering Board,2006,30(2):29-33.
[12]苗张木.厚钢板焊接接头韧度CTOD评定研究[D].武汉:武汉理工大学,2005.
[13]KANVINDE A M,DEIERLEIN G G.Cyclic voidgrowth model to assess ductile fracture initiation instructural steels due to ultra low cycle fatigue[J].ASCE Journal of Engineering Mechanics,2007,133(6):701-712.
[14]QIU H,ITO R,HIRAOKA K Z.Role of grain size onthe strength and ductile-brittle transition temperature inthe dual-size ferrite region of the heat-affected zone ofultra-fine grained steel[J].Materials Science andEngineering:A,2006,435-436:684-652.
[15]OI K J.High tensile strength steel material havingexcellent delayed fracture resistance property,andmethod of manufacturing the same:United States,20080110535[P].2008-05-15.
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