工程力学英文版课件00 Introduction.ppt

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1、IntroductionEngineeringMechanics1ResultantofConcurrentForcesinaPlaneWhyEngineeringMechanicsSuspensionbridge2ResultantofConcurrentForcesinaPlaneSteelcables3ResultantofConcurrentForcesinaPlaneBridgepier4ResultantofConcurrentForcesinaPlane5ResultantofConcurrentForcesinaPlane6ResultantofConcur

2、rentForcesinaPlane7ResultantofConcurrentForcesinaPlane8ResultantofConcurrentForcesinaPlaneFiniteelementmodellingofcarcrash9ResultantofConcurrentForcesinaPlane10ResultantofConcurrentForcesinaPlane11ResultantofConcurrentForcesinaPlane12ResultantofConcurrentForcesinaPlaneGears13ResultantofCon

3、currentForcesinaPlaneArtificialbone14ResultantofConcurrentForcesinaPlaneIntroductionMechanicscanbedefinedasthatbranchofthephysicalsciencesconcernedwiththestateofrestormotionofbodiesthataresubjectedtotheactionofforces.Thissemester,twoveryimportantbranchesofmechanics,namely,staticsandmechani

4、csofmaterialswillbestudied.15ResultantofConcurrentForcesinaPlaneStatics:Thesubjectdealswiththeequilibriumofrigidbodies,thatis,itisusedtodeterminetheforcesactingeitherexternaltothebodyorwithinitnecessarytokeepthebodyeitheratrestormovingwithaconstantvelocity.Thegeneralproblemofstaticsconsist

5、sinreducingagivensystemofforcestoitssimplestequivalent,i.e.,toitsresultant.16ResultantofConcurrentForcesinaPlaneMechanicsofmaterials:Thesubjectstudiestherelationshipsbetweentheexternalloadsandtheintensityofinternalforcesactingwithinthebody.Thissubjectisalsoconcernedwithcomputingthedeformat

6、ionsofthebody,anditprovidesastudyofthebody’sstabilitywhenthebodyissubjectedtoexternalforces.17ResultantofConcurrentForcesinaPlaneStrength：Capacityofacomponentorastructuralelementtoresistfailure.Rigidity(Stiffness)：Capacityofacomponentorastructuralelementtoresistdeformation.Stability:Capaci

7、tyofacomponentorastructuralelementtoretaintheoriginalstateofequilibrium.18ResultantofConcurrentForcesinaPlaneUndertherequirementthatthestrength,rigidity,stabilitycriteriaaresatisfied,providethenecessaryfundamentaltheoryandmethodofcalculationfordeterminingreaso