吉大《工程力学》在线作业一（kyrgyzstan engineering mechanics online homework）

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1、吉大《工程力学》在线作业一（KyrgyzstanEngineeringMechanicsonlinehomework）Kyrgyzstan"EngineeringMechanics"onlinehomeworkTotalscore:100testtime:-RadioexaminationJudgmentquestionRadioexaminationquestions(10questions,40points)1.themechanicalpropertiesoflowcarbonsteelaftercoldhardenin

2、ghavethefollowingchanges.A.yieldstressincreasesandelasticmodulusdecreasesB.yieldstressincreasesandtoughnessdecreasesTheC.yieldstressremainsunchangedandtheelasticmodulusremainsconstantTheD.yieldstressremainsunchangedandthetoughnessremainsunchangedFullmarks:42.theabil

3、ityofacomponenttoactunderexternalforceiscalledstability.A.doesnotbreakB.doesnotdeformC.keepstheoriginalbalanceD.staysstillFullmarks:43.therectangularsectionbeamissubjectedtobendingdeformation.Iftheheightofthecrosssectionofthebeamisdoubled,themaximumnormalstressinthe

4、beamisseveraltimesthatoftheoriginalbeam()A.1/2timesB.1/4C.1/8timesD.isnotsureFullmarks:44.threerigidplatesarejoinedby(or)threehinges22toformageometricinvariantsystem.A.collinearB.isnotcollinearC.virtualD.nonvirtualFullmarks:4Thedifferentialequationofdeflectioncurveo

5、f5.beamisestablishedunder()condition.ThedeformationofA.beamissmalldeformationB.materialobeysHooke'slawTheC.deflectioncurveisinthexoyplaneD.meetsA,B,CatthesametimeFullmarks:4Thedeflectionofthe6.beamis().Thedisplacementofaverticalpointalongtheaxisofabeamatanypointinth

6、ecrosssectionofaA.ThelineardisplacementofthecentroidoftheB.crosssectionalongtheverticalaxisofthebeamThelinedisplacementofthecenteroftheC.crosssectionalongthebeamaxisDisplacementofcentroidofD.crosssectionFullmarks:47.,theapplicablescopeofgeneralizedHooke'slawis().A.b

7、rittlematerialB.plasticmaterialC.anymaterialTheD.materialisisotropicandinalinearelasticrangeFullmarks:48.ofthefollowingconclusions,only()iscorrect.A.internalforceisthealgebraicsumofstressB.stressisthedistributiondegreeofinternalforce,andinternalforceistheresultantfo

8、rceofstressC.stressistheresultantforceofinternalforcesD.internalforcemustbegreaterthanstressFullmarks:49.theuniformityassumptionassumestha