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ID:16172522
大小:24.28 KB
页数:15页
时间:2018-08-08
《第章钢结构材料(the second chapter is steel structure material)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第2章钢结构材料(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.Plasticpl5、asticity-referstotheabilitytoproduceplasticdeformationbeforefailureofsteel.Measurementstandard-elongationfactorL1?L0delta=x100%l0Type:l0-–lengthofspecimengauge,l0=5d0orl0=10d0;lengthofgaugedistanceofL1-–specimenafterbreaking.-sectionshrinkagepropertiesPSI=A0?A1x100%A0Three.ColdbendingpropertyC6、oldbendingperformance--tomeasuretheplasticdeformationofsteelatcoldbendingatroomtemperature.Figure2.3coldbendingpropertytestFour,toughness---tomeasurethemechanicalpropertiesofsteelagainstbrittlefailure,anditsphysicalsignificanceistheimpactenergy(J)absorbedbythecomponentduringbrittlefracture.Fig7、ure2.4impacttoughnesstestandspecimennotchformFive,weldabilityweldabilityreferstoacertainmaterial,processandstructureconditions,steelafterweldingcangetgoodweldingjointperformance.Solderabilityisaffectedbycarboncontentandalloyingelementco
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
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