第2章钢结构材料

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1、第2章钢结构材料The212contributionfromeasywaterPptdocumentsmayexperiencepoorbrowsingontheWAPside・ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.ThesecondchapteristhematerialofsteelstructurePlasticfailureDestructionofsteelBrittlefractureTheSteelSection2.1mainmechanicalper

2、formanceofsteelmechanicalproperties一variouspropertiesofsteelinvariouseffectsreflect,includingstrength,ductilityandtoughnessetc・・Strength,strength一一theabilityofsteeltoresistloadingwithoutbreakingorfailure・Fig.2.1statictensilecurveofcarbonstructuralsteel(Q235steel)1.Sigma:elasticstageislessth

3、anorequaltoFPtype:FP-proportionallimitF2.elastic-plasticstage:P<<<

4、ialforperfectlyplasticbody(ignoringstrainhardening)SigmaFYZeroEFigure2.2stressstraincurveofperfectlyelasticplasticbodyThreeimportantindexesofsteelstrengtharedefined:FY,FuandDeltaStrengthratioFY/Fu—parametersofsteelstrengthreserve,FY/Fu,strengthreserveTwo、plasticity-plasticity-referstotheabi

5、litytoproduceplasticdeformationbeforefailureofthestee1.MeasurementpercentageelongationLI二10delta二x100%10Type:10--lengthofspecimennominaldistanee,10=5d0or10二lOdO;LI—lengthofgaugedistanceofspecimenafterbreak.-sectionshrinkagepropertiesPSI二AOAlx100%AOThree,coldbendingpropertyColdbendingpropert

6、ies—measuringtheabilityofsteeltoproduceplasticdeformationwhencoldworkingandbendingatroomtemperature・Figure2.3coldbendpropertytestFour,toughnesstomeasurethemechanicalpropertiesofsteelagainstbrittlefailure,anditsphysicalsignificanceistheimpactenergy(J)absorbedbythecomponentduringbrittlefractu

7、re・Figure2.4impacttoughnesstestandspecimennotchFiveweldabilityweldabilityreferstoacertainmaterial,processandstructuralconditions,steelafterweldingcangetgoodperformanceofweldedjoints・Weldabilityisaffectedbycarboncontentandalloyingelementcontent・Carboncont