最新英汉双语材料力学2课件ppt.ppt

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1、英汉双语材料力学2材料力学第二章剪切CHAPTER2SHEAR§2－1STRENGTHCALCULATIONABOUTSHEARANDBEARINGOFCONNECTINGMEMBERSEXCERCISELESSONSOFSHEARANDBEARING§2－1STRENGTHCALCULATIONABOUTSHEARANDBEARINGOFCONNECTINGMEMBERS1、Characteristicsofloadsanddeformationofconnectingmembers:1)Conne

2、ctingmemberThestructurememberthatconnectsonemembertoanotheriscalledtheconnectingmember.Suchas：bolts、rivets、keysetc.Theconnectingmemberissmall，butitplaystheroleofpassingloads.Characteristic：Itcanpassgeneralloadsandcanbedismounted.PPboltSHEAR§2－1连接件的剪切与挤压强

3、度计算一、连接件的受力特点和变形特点：1、连接件剪切在构件连接处起连接作用的部件，称为连接件。例如：螺栓、铆钉、键等。连接件虽小，却起着传递载荷的作用。特点：可传递一般力，可拆卸。PP螺栓PPrivetCharacteristic:Itcanpassgeneralloads,butcannotbedismounted.forexample,thetrussinabridgeisconnectedbyit.nogapCharacteristic:Itcanpasstorques.SHEARmShaftKe

4、yGearmPP剪切铆钉特点：可传递一般力，不可拆卸。如桥梁桁架结点处用它连接。无间隙m轴键齿轮特点：传递扭矩。m2)Characteristicsofloadsanddeformation：nn（Resultant）（Resultant）PPUsearivetasanexample：①Characteristicofloads：Therivetissubjectedtotwoequalandoppositeforces.Theactinglinesofthesetwoforcesareveryclos

5、e.②Characteristicofdeformation:Twopartssubjectedtotwoequalandoppositeforcestendtoshiftoveroneanotheralongthejunctionplaneoftwoforces.SHEAR2、受力特点和变形特点：剪切nn（合力）（合力）PP以铆钉为例：①受力特点：构件受两组大小相等、方向相反、作用线相距很近（差一个几何平面）的平行力系作用。②变形特点：构件沿两组平行力系的交界面发生相对错动。nn（Resultant）

6、（ResultantPP③Shearingplane：Theplanealongwhichtwopartsofthemembertendtoshiftoveroneanother.Suchasn–n.④Internalforceonshearingplane：Internalforce—ShearingforceQ，itsactinglineisparalleltotheshearingplane.PnnQShearingplaneSHEAR剪切nn（合力）（合力）PP③剪切面：构件将发生相互的错动面，

7、如n–n。④剪切面上的内力：内力—剪力Q，其作用线与剪切面平行。PnnQ剪切面nn(Resultant)(Resultant）PP3)Threekindsofbreakageatjoint：①FailureduetoshearSnipalongtheshearingplaneoftherivet,suchasalongsectionn–n.②BreakageduetobearingFailduetomutualbearingbetweentherivetandthesteelplateintheirco

8、nnectingplane.③BreakageduetotensionPnnQShearingplaneThesteelplateisweakenedinthesectioninwhichtherivetholesexistandstressintheweakenedsectionincreasessothatthesteelplateiseasilybrokenduetotensionattheconnectingposition.SHE