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1、AbstractSpotweldingisthemost-widely-usedkindofbondingtechnologywiththemaximumefficiencyinthecarbodymanufacturingprocess.Andthespotweldingquality,mechanicalpropertiesandweldingdistortionofsheetmetal,havealwaysbeenaverystrikingproblemintheengineeringpractice,asitafftctsthesafetyandqualityofcars.Theref
2、ore,researchthemechanicalpropertiesofspotweldedstructuresisofgreatsignificancetoimproveproductquality,enhancethemarketcompetitivenessofproducts.DP600dual-phasehigh-strengthsteelisamaterialwhichhasrecentlybeenwidelyusedinmachineryproduction,inthisstudy,theweldingprocessofequal-thicknessDP600steelplat
3、ewasfirstlythermalsimulated,usingthethermalcouplingunitestablishedatwo・dimensionalaxisymmctricfiniteelementmodel,simplifyingthecontactresistancebetweenthecombinationsurfaceandelectrode-workpieceinterfacetoafunctionoftemperature,analyzingtheweldingprocessoftheequal-thicknesssheetconsideringthetempera
4、ture-dependentthermophysicalpropertiesparametersofthematerialandgottheresultsoftemperaturefieldanalysis.Then,takethermalelastic-plasticanalysisonresistancespotweldingprocessofthesheetwithtemperature,intheanalysiswccangetthecontactpressuredistributionandvariationofcombinesurfaceandelectrode-workpiece
5、interface,aswellasthestress,strainanddeformationofspotweldingjoints.Secondly,withthemaximumcircumferentialstrainfailurecriteria,respectivelynumericalsimulatedthecrackextensionprocessofDP600dual-phaseequal-thicknesssteelplateweldedstructure,whenit'sunderaone-waystrippingloadandundersymmetricalcyclest
6、rippingloading,togetthetrendsandpatternsofstressandstrainduringtheinternalcrackgrowthofweldedstructures•Finally,calculatedstressintensityfactorofthecracktippoint,andanalyzedthetrends.Keywords:sheetfiniteelementtemperaturestress-straincrackpropagation目录摘要IAbstractII1绪论1.1选题背景、意义及课题来源(1)1.2国内外研究现状与趋势(
7、1)1.3木文研究内容与结构安排(7)2点焊通电加热过程的温度场模拟及弹塑性分析2.1温度场的计算(9)2.2基于温度场结果的热弹塑性分析(17)2.3本章小结(21)3点焊结构在单向剥离载荷下的裂纹扩展分析3.1断裂力学基本理论(22)3.2本研究用到的失效准则(25)3.3点焊结构在单向剥离载荷下裂纹扩展有限元模拟(26)3.4本章小结(33)4对称循环载荷下焊接结构的裂纹扩展4.1模拟前处理
