Foundations of Solid Mechanics-東南大學(xué)中國(guó)大學(xué)mooc課后章節(jié)答案期末考試題庫(kù)2023年

FoundationsofSolidMechanics_東南大學(xué)中國(guó)大學(xué)mooc課后章節(jié)答案期末考試題庫(kù)2023年Thevirtualworkprincipleisvalidforbothlinearandnonlinearhyperelasticmaterialsundergoingsmalldeformation.

參考答案:

正確

The()isdefinedastheworkdoneonadeformablebodybyalltypeforces,includingsurfaceandbodyforces.

參考答案:

virtualwork

Themaximumnormalstresscriterionisnotgoingtobeaccurateforhydrostaticcompression.

參考答案:

正確

Thosevectorsandmatricesthatsatisfythetransformationrulesbetweencoordinatesarecalledtensors.

參考答案:

正確

Howmuchisthedeterminantofthetransformationmatrixbetweendifferentcoordinatesystems?

參考答案:

1_-1

Fatiguehasthefollowingfeatures:

參考答案:

Itisofteninfluencedbyfactorseludingrecognition_Itoftenstartsfromsurfacedefects_Itnormallyoccursinrotatingmachineparts_Itusuallyresultsinbrittlefracture

WhatarebasicdeformationmodesinMechanicsofMaterials?

參考答案:

Simplebeambending_Shearduetotransverseload_Simpletorsion_Simpletension

Thereareonlytwotypesofforces.Oneiscontactorsurfaceforces,anotheriscalledthe()force.

參考答案:

body

Theelasticmaterialsalwaysbehavelinearly.

參考答案:

錯(cuò)誤

WhichofthefollowingstatementsarecorrectforCastigliano'sfirsttheorem?

參考答案:

Thistheoremisvalidforbothlinearandnonlinearelasticmaterials._Thespecificmaterialresponsesdoaffecthowstrainenergyiscalculated._Thistheoremissimplyanapplicationoftheminimumtotalpotentialenergy_Weneedtoexpressthestrainenergydirectlyintermsofdisplacements.

ThesethreeI1I2andI3inthecharacteristiccubicequationwillbechangingwiththecoordinatetransformation.

參考答案:

錯(cuò)誤

Whichofthefollowingcorrespondingstrainenergydensitiescontainonlyoneterm?

參考答案:

Pureshearstate_Uniaxialstressstate

Inthemostgeneralcase,wecandividethefailurecriteriaintotwobigparts.Onefor()criteria,andmostlyforductilematerials,likemetals.

參考答案:

yielding

Inmechanicsofmaterials,theshearstrainvarieslinearlyfromzeroatthecentertoamaximumontheoutersurfaceforcircularcrosssections.

參考答案:

正確

For2Dcase,wewillhave()constitutiveequations.

參考答案:

three

Thedeviatoricstressstateisresponsibleforthevolumechange.

參考答案:

錯(cuò)誤

Whichofthefollowingstatementsisnotcorrectforshearcenter?

參考答案:

Thelocationoftheshearcenterisdependentofthedirectionandmagnitudeofthetransverseforces

Acurvedbarorbeamisastructuralelementforwhichthelocusofthecentroidsofthecrosssectionsisacurvedline()deformation.

參考答案:

before

Whichofthefollowingstatementsarecorrectforunsymmetricbending?

參考答案:

Theresultantmomentisnolongerparalleltotheneutralaxis_Theresultantmomentisperpendiculartotheloadingplane_Thelateraldeflectionisperpendiculartotheneutralaxis_Itdoesn’trequiresuchasymmetryplanefortheloads

Wecanchooseanyplanecoordinatesintheunderunsymmetricbending,unlesstheyarerequiredtobecentroidalaxis.

參考答案:

正確

Inthemechanicsofmaterials,wealwaysassumesomekinematicrelationsdealingwithsomeassumeddeformationmodes.

參考答案:

正確

Forthedisplacementformulationmethod,weneedtouse().

參考答案:

Hooke'slaw_Geometrical_Equationsofmotion

Whichofthefollowingmaterialsaretypicallyanisotropic?

參考答案:

Composites_Woods_Aggregates_Bones

Wewillhavetouse(),andtheboundaryconditionsEq.(5)fortypicalstressformulationmethod.

參考答案:

Equilibrium_Constitutive_Compatibility

Forprinciplestressstates,wedonothave()component.

參考答案:

shearstress

Bydefinition{}issimplystrainenergyperunitvolume.

參考答案:

thestrainenergydensity##%_YZPRLFH_%##strainenergydensity

Wecanwrite【圖片】

參考答案:

錯(cuò)誤

Thehomogenousmaterialcanbeanisotropic.

參考答案:

正確

HowmanytimesdidweapplyGreen'stheoryindevelopingAiry'sstressfunction?

參考答案:

3

WhichofthefollowingequationscanbetreatedasthedefiningequationsoftheAiry'sstressfunction?

參考答案:

___

Whichofthefollowingtypesofboundaryconditionsisnotcorrect?

參考答案:

Bothatractionandadisplacementcomponentsareprescribedineachdirection.

Forplanestressstate,alloutofplanestresscomponentsareidenticallyzero.

參考答案:

正確

Inplanestrainstate,alloutofplane()componentsareidenticallyzero.

參考答案:

strain

Wecanhavethegeneralstressstatedecompositionas

參考答案:

deviatoricstressstate_hydrostaticstressstate

Hassolidmechanicsfounditsapplicationsinwhichofthefollowingengineeringareas?

參考答案:

Civilengineering_Aeronauticalandaerospaceengineering_Mechanicalengineering_Materialsscienceandengineering

{}representsthepartoftheenergythatiscomplementarytothestrainenergy

參考答案:

complementaryenergy##%_YZPRLFH_%##Complementaryenergy

Thestrainenergywillbeworkdonebyinternalforces.

參考答案:

正確

Whichofthefollowingstatementsarecorrectforsymmetricbending?

參考答案:

Theresultantmomentalwaysparalleltotheneutralaxis_Allthetransverseloadsactingonasymmetryplane_Thelateraldeflectionisperpendiculartotheneutralaxis,andparalleltotheloadingplane_Stresscomponentsforsymmetricbendingcanbeobtainedfrommechanicsofmaterialsapproach

Whentheforcedoesnotactthroughtheshearcenter,inadditiontobending,atwistingactionresults.

參考答案:

正確

Weassumethatthereisonly()inthecurrentunsymmetricbeam.

參考答案:

bending

Considerthefollowingthreestatesofprincipalstresses,inMPa:【圖片】UsingtheTrescaCriterion,rankthesestatesofstress,frommostdangeroustoleast.

參考答案:

(3)>(1)=(2)

WhichofthefollowingequationsareincludedinAiry'sstressfunctionmethod?

參考答案:

__

Whichofthefollowingmodeisnonlinear?

參考答案:

Shearduetotransverseload

Forageneralstressstate,whichofthefollowingrelationsarecorrect?

參考答案:

__

Fromthenormalstressformulaequationinpurebendingcase,thelargestnormalstresswillbeeitheronthetoporonthebottomofthebeamonthecrosssection,wherethemomentislargest.

參考答案:

正確

Bystresswemeantheintensityof()force.

參考答案:

aninternal##%_YZPRLFH_%##internal

Whichofthefollowingstatementsisnotcorrectforcurvedbeams?

參考答案:

Theinfluenceoftransverseshearonbeamdeformationmustbetakenintoaccount

Intreatingnon-circularprismaticbars,whichofthefollowingstatementsarecorrect?

參考答案:

Weneedtodevelopnewtheoriesthatcanaccountforwarpingofthecrosssection._Theshearstressesaretreatedtobezeroatcorners_Theshearstresses

variesalongthesamecontouronthesamecross-section

Examplesofscalarsinclude

參考答案:

densityofmaterials_mass_temperature

Inindicialnotation,noindexcanappearmorethan()timesinasinglealgebraicterm.

參考答案:

2

Intreatingnon-circularprismaticbars,crosssectionsinitiallyplaneexperienceout-of-planedeformationorwarping,andthebasickinematicassumptionsoftheelementarytheoryareappropriate.

參考答案:

錯(cuò)誤

InPrandtlstressfunctionmethod,thestressfunction【圖片】is()onthelateralsurface.

參考答案:

constant##%_YZPRLFH_%##aconstant##%_YZPRLFH_%##zero##%_YZPRLFH_%##0

Thefeaturesofenergymethods:

參考答案:

Theyareapplicabletobothlinearandnonlinearmaterials_TheyanalogoustoLagrange’ssolutionfordiscretesystemsindynamics_Theyareappliedtoderiveapproximatesolutionsortoformulatecomputermodels_Theyinvolveonlyscalerquantities,suchasworkandenergy

The()isahypotheticalverysmalldisplacementthatisconsistentwithkinematicconstraints.

參考答案:

virtualdisplacement

Inthehistoryofsolidmechanics,whofirstpointedoutthatabodyisdeformedsubjecttotheactionofaforce?

參考答案:

RobertHooke

Theroleofvariationalprinciples:

參考答案:

Manyproblemsofmechanicsareposedintermsoffindingtheextremumandthus,bytheirnature,canbeformulatedintermsofvariationalstatements._Thereareproblemscanbeformulatedbyothermeans,suchasbyvectormechanics,butthesecanalsobeformulatedbymeansofvariationalprinciples._Variationalformulationsformapowerfulbasisforobtainingapproximatesolutionstopracticalproblems,manyofwhichareintractableotherwise._Variationalformulationscanalsoservetounifydiversefields,suggestnewtheories,andprovideapowerfulmeansforstudyingtheexistenceanduniquenessofsolutionstoproblems.

Theshearcenterofathin-walledopencross-sectioncanbe()fromthecentroid,unlikethatforasolidorthick-walledcross-section.

參考答案:

faraway##%_YZPRLFH_%##away

TheAirystressfunctionin2-Delasticitysatisfiesabiharmonicequationthatisobtainedfromthe()equation.

參考答案:

compatibility

Highcyclefatigueiscontrolledbyplasticdeformations,whilelowcyclefatigueiselasticdeformation-based.

參考答案:

錯(cuò)誤

TheCoulomb-Mohrfailurecriterionincludesthemaximumnormalstresscriterionasaspecialcase.

參考答案:

正確

Whichofthefollowingdescriptionsisnotcorrect?

參考答案:

Thefatiguelifeinthelowcyclefatigueislong.

Whichofthefollowingcriterioncanbeapplyforductilematerial?

參考答案:

VonMisescriterion_Octahedralshearstresscriterion_Trescacriterion

Ifthereisanobservablecrack,wecanstillusefailurecriteria.

參考答案:

錯(cuò)誤

Inthemostgeneralcase,wecandividethefailurecriteriaintotwobigparts.Onefor()criteria,whichforbrittle