2.searing and bearing

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1、MechanicsofMaterialsChapter2ShearingandBearingHENANUNIVERSITYSCIENCE&TECHNOLOGYEditedbyYANGMIN-xianCHAPTER2SHEARANDBEARING§2－1AVERAGESTRENGTHCALCULATIONABOUTSHEARINGANDBEARINGOFCONNECTINGMEMBERSEXCERCISELESSONSOFSHEARANDBEARING§2－1AVERAGESTRENGTHCALCULATIONABOUTSHEARANDBEARIN

2、GOFCONNECTINGMEMBERS1、Characteristicsofloadsanddeformationofconnectingmembers:1)ConnectingmemberThestructurememberthatconnectsonemembertoanotheriscalledtheconnectingmember.Suchas：bolts、rivets、keysetc.Theconnectingmemberissmall，butitplaystheroleofpassingloads.Characteristic：It

3、canpassgeneralloadsandcanbedismounted.PPboltSHEARPPrivetCharacteristic:Itcanpassgeneralloads,butcannotbedismounted.forexample,thetrussinabridgeisconnectedbyit.nogapCharacteristic:Itcanpasstorques.SHEARmShaftKeyGearm2)Characteristicsofloadsanddeformation：nn（Resultant）（Resultan

4、t）PPUsearivetasanexample：①Characteristicofloads：Therivetissubjectedtotwoequalandoppositeforces.Theactinglinesofthesetwoforcesareveryclose.②Characteristicofdeformation:Twopartssubjectedtotwoequalandoppositeforcestendtoshiftoveroneanotheralongthejunctionplaneoftwoforces.SHEARnn

5、（Resultant）（ResultantPP③Shearingplane：Theplanealongwhichtwopartsofthemembertendtoshiftoveroneanother.Suchasn–n.④Internalforceonshearingplane：Internalforce—ShearingforceQ，itsactinglineisparalleltotheshearingplane.PnnQShearingplaneSHEARnn(Resultant)(Resultant）PP3)Threekindsofbr

6、eakageatjoint：①FailureduetoshearSnipalongtheshearingplaneoftherivet,suchasalongsectionn–n.②BreakageduetobearingFailduetomutualbearingbetweentherivetandthesteelplateintheirconnectingplane.③BreakageduetotensionPnnQShearingplaneThesteelplateisweakenedinthesectioninwhichtheriveth

7、olesexistandstressintheweakenedsectionincreasessothatthesteelplateiseasilybrokenduetotensionattheconnectingposition.SHEAR2、PracticalcalculationofshearMethodofthepracticalcalculation：Accordingtopossibilityofbreakageofthemembersomeassumptionsbywhichbasiccharacteristicsubjectedt

8、oforceactionscanbereflectedandcalculationscanbesimplifiedareused.The