第章鋼結(jié)構(gòu)材料（the second chapter is steel structure material）

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1、第2章鋼結(jié)構(gòu)材料（Thesecondchapterissteelstructurematerial）The212contributionfromeasywaterPptdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyouselectTXTfirstordownloadthesourcefiletothelocalmachine.ThesecondchapteristhematerialofsteelstructurePlasticfailureDestructionofsteelBrittlefa

2、ilureTheSteelSection2.1mainmechanicalperformanceofsteelmechanicalproperties-variouspropertiesofsteelinvariouseffectsreflect,includingstrength,ductilityandtoughnessetc..Strength,strength--steelresistancetofailureorfailuretowithstandloads.Figure2.1statictensilecurveofcarbonstructuralsteel(Q235st

3、eel)1.Sigma:elasticstageislessthanorequaltoFPtype:FP-proportionallimitF2.elastic-plasticstage:P<<<

4、agreaterthanorequaltoFY-materialforperfectlyplasticbody(ignoringstrainhardening)SigmaFYZeroEFig.2.2stressstraincurveofperfectlyelasticplasticbodyThreeimportantindexesofsteelstrengtharedefined:FY,FuandDeltaYieldstrengthratioFY/Fu–steelstrengthreserveparameters,FY/Fu,strengthreserveTwo.Plasticpl

5、asticity-referstotheabilitytoproduceplasticdeformationbeforefailureofsteel.Measurementstandard-elongationfactorL1?L0delta=x100%l0Type:l0-–lengthofspecimengauge,l0=5d0orl0=10d0;lengthofgaugedistanceofL1-–specimenafterbreaking.-sectionshrinkagepropertiesPSI=A0?A1x100%A0Three.ColdbendingpropertyC

6、oldbendingperformance--tomeasuretheplasticdeformationofsteelatcoldbendingatroomtemperature.Figure2.3coldbendingpropertytestFour,toughness---tomeasurethemechanicalpropertiesofsteelagainstbrittlefailure,anditsphysicalsignificanceistheimpactenergy(J)absorbedbythecomponentduringbrittlefracture.Fig

7、ure2.4impacttoughnesstestandspecimennotchformFive,weldabilityweldabilityreferstoacertainmaterial,processandstructureconditions,steelafterweldingcangetgoodweldingjointperformance.Solderabilityisaffectedbycarboncontentandalloyingelementco