工程力学英文版课件07 Stress for Axial Loads.ppt

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1、InternalReactions:StressforAxialLoadsEngineeringMechanics1§10–1Introduction§10–2ProblemsInvolvingNormal,ShearandBearingStress§10–3AllowableStress§10–4StressesonObliqueSectionsInternalReactions:StressforAxialLoadsInternalReactions:StressforAxialLoads2§10-1

2、IntroductionInternalReactions:StressforAxialLoads3Mechanicsofmaterialsisabranchofmechanicsthatstudiestherelationshipsbetweentheexternalloadsappliedtoadeformablebodyandtheintensityofinternalforcesactingwithinthebody.InternalReactions:StressforAxialLoads4Th

3、issubjectalsoinvolvescomputingthedeformationsofthebodywhenthebodyissubjectedtoexternalforces.InternalReactions:StressforAxialLoads5Anditprovidesastudyofthebody’sstabilitywhenthebodyissubjectedtoexternalforces.InternalReactions:StressforAxialLoads6Resultan

4、tofConcurrentForcesinaPlaneStrength：Capacityofacomponentorastructuralelementtoresistfailure.Rigidity(Stiffness)：Capacityofacomponentorastructuralelementtoresistdeformation.Stability:Capacityofacomponentorastructuralelementtoretaintheoriginalstateofequilib

5、rium.71.InternalReactionsForcescreatedwithinobjectsthatareacteduponbyexternalloads,includingaxialforce,shearforce,bendingmoment,andtorqueortwistingmoment.Inordertofindinternalforcesinmembersofasystem,thememberwascutwithasection.Thenafree-bodydiagramofeith

6、erpartofthismemberwasconstructed.Theforcesinthememberscutbecameexternalforcesandwerefoundbytheequilibriumequations.InternalReactions:StressforAxialLoads8Asectionwasusedtocutthememberintotwoparts.InternalReactions:StressforAxialLoadsF1FnF3F29Theinternalfor

7、cesofthemembercutbecametheexternalforces,andcanbefoundbytheequilibriumequations.InternalReactions:StressforAxialLoadsF1FnF3F210AxialforceFN,BendingmomentMB,ShearforceFQ,TorqueortwistingmomentMXInternalReactions:StressforAxialLoadsFRFNFQMMBMx11Procedurefor

8、themethodofsectionCalculationoftheinternalforcesisfoundationtoanalyzetheproblemsofstrength,rigidity,stabilityetc.Generalmethodtodetermineinternalforcesisthemethodofsection.Thefollowingstepsshouldbeperformed:Cutoff.A