【MOOC】《彈性力學(xué)及有限元》(東南大學(xué))章節(jié)中國大學(xué)慕課答案

【MOOC】《彈性力學(xué)及有限元》(東南大學(xué))章節(jié)中國大學(xué)慕課答案

有些題目順序不一致，下載后按鍵盤ctrl+F進(jìn)行搜索1.Introduction第一章測試1.單選題：Whichofthefollowingequationsisincorrectwithrespecttotheprincipleofreciprocalshearstress?

選項(xiàng)：

A、

B、

C、

D、

答案：【】2.多選題：Whichofthefollowingoptionsareanisotropic:

選項(xiàng)：

A、Bamboo

B、Wood

C、Steel

D、Concretecomponents

答案：【Bamboo;Wood】3.多選題：Whichofthefollowingoptionsarebasicassumptionsinelasticity:

選項(xiàng)：

A、Continuity

B、Elastic

C、Anisotropic

D、Homogeneity

E、Smalldeformation

答案：【Continuity;Elastic;Homogeneity;Smalldeformation】4.單選題：Shearstrainisnegativewhentherightanglebecomessmallerandpositivewhenitbecomeslarger.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】5.單選題：Theshearstressactingonthepositiveplaneandalongthepositivedirectionispositive.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】6.單選題：Onthenegativeface,thestressalongthenegativedirectionofcoordinateisnegative.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】7.單選題：Thefacewhosenormaldirectionconsistentwiththepositivedirectionofthecoordinateispositiveface.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】8.Anobjectthatmeetsthefourassumptionsofcontinuity,elastic,homogeneity,and_______iscalledanidealelasticbody.

答案：【isotropic】9.Elasticityisstudiedbyrigorouslyconsideringstatic,geometrical,andphysicalconditionsaswellas______conditionsintheregionoftheelasticbody.

答案：【boundary】10.Foranelasticbody,thestresshasa_______relationshipwithcorrespondingstrainunderexternalloading,andwhenthebodyisunloaded,itcanrecovertoitsoriginalshape.

答案：【linear】3.BasicTheoryofPlaneProblems第三章測試1.單選題：Inaplanestrainproblem,howmanyprincipalstressesexistatapoint?

選項(xiàng)：

A、0

B、1

C、2

D、3

答案：【3】2.單選題：Howmanyindependentequilibriumdifferentialequationsarethereintheplaneproblem?

選項(xiàng)：

A、3

B、2

C、4

D、5

答案：【2】3.單選題：Pleasecompletethetablebelow:PlanestressproblemPlanestrainproblemExternalforceShape④

選項(xiàng)：

A、Paralleltotheplaneofxoy,anduniformlydistributedalongthethicknessofthethinplate.

B、BodyandsurfaceforcesparalleltotheplaneofxOyplaneandkeepconstantalongtheaxisofzfortheprismwithinfinitelength.

C、Prismwithinfinitelength,andcrosssectionkeepsthesamealongthezaxis.

D、Platethicknesskeepsconstantandismuchsmallerthanthesizesoflengthandwidth.

答案：【Prismwithinfinitelength,andcrosssectionkeepsthesamealongthezaxis.】4.單選題：Pleasecompletethetablebelow:PlanestressproblemPlanestrainproblemExternalforceShape③

選項(xiàng)：

A、Paralleltotheplaneofxoy,anduniformlydistributedalongthethicknessofthethinplate.

B、BodyandsurfaceforcesparalleltotheplaneofxOyplaneandkeepconstantalongtheaxisofzfortheprismwithinfinitelength.

C、Prismwithinfinitelength,andcrosssectionkeepsthesamealongthezaxis.

D、Platethicknesskeepsconstantandismuchsmallerthanthesizesoflengthandwidth.

答案：【Platethicknesskeepsconstantandismuchsmallerthanthesizesoflengthandwidth.】5.單選題：Pleasecompletethetablebelow:PlanestressproblemPlanestrainproblemExternalforce②Shape

選項(xiàng)：

A、Paralleltotheplaneofxoy,anduniformlydistributedalongthethicknessofthethinplate.

B、BodyandsurfaceforcesparalleltotheplaneofxOyplaneandkeepconstantalongtheaxisofzfortheprismwithinfinitelength.

C、Prismwithinfinitelength,andcrosssectionkeepsthesamealongthezaxis.

D、Platethicknesskeepsconstantandismuchsmallerthanthesizesoflengthandwidth.

答案：【BodyandsurfaceforcesparalleltotheplaneofxOyplaneandkeepconstantalongtheaxisofzfortheprismwithinfinitelength.】6.單選題：Pleasecompletethetablebelow:PlanestressproblemPlanestrainproblemExternalforce①Shape

選項(xiàng)：

A、Paralleltotheplaneofxoy,anduniformlydistributedalongthethicknessofthethinplate.

B、BodyandsurfaceforcesparalleltotheplaneofxOyplaneandkeepconstantalongtheaxisofzfortheprismwithinfinitelength.

C、Prismwithinfinitelength,andcrosssectionkeepsthesamealongthezaxis.

D、Platethicknesskeepsconstantandismuchsmallerthanthesizesoflengthandwidth.

答案：【Paralleltotheplaneofxoy,anduniformlydistributedalongthethicknessofthethinplate.】7.多選題：Whichofthefollowingoptionsarebasicassumptionsofequilibriumequations?

選項(xiàng)：

A、Continuity

B、Elastic

C、Isotropic

D、Homogeneity

E、Smalldeformation

答案：【Continuity;Smalldeformation】8.多選題：Whichofthefollowingoptionsarebasicassumptionsofgeometricequations?

選項(xiàng)：

A、Continuity

B、Smalldeformation

C、Elastic

D、Isotropic

E、Homogeneity

答案：【Continuity;Smalldeformation】9.多選題：Whichofthefollowingoptionsarebasicassumptionsofphysicalequations?

選項(xiàng)：

A、Continuity

B、Smalldeformation

C、Elastic

D、Isotropic

E、Homogeneity

答案：【Continuity;Elastic;Isotropic;Homogeneity】10.單選題：Theequilibriumequations,geometricequations,stressboundaryconditions,anddisplacementboundaryconditionsforplanestressproblemsandplanestrainproblemsareentirelyidentical,differingonlyinthecoefficientsofthephysicalequations.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】11.單選題：Inaplanestrainproblem,thereareonlythreestraincomponentswithintheplane.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】[vk-content]12.單選題：Inaplanestressproblem,thereareonlythreestresscomponentswithintheplane.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】13.istheelasticbodywithonlyonecontinuousboundary.

答案：【Singleboundaryelasticbody】14.Stressbasedmethod:Thestresscomponentsareusedasthebasicunknownfunctions,andthecomponentsareeliminatedtoobtaintheequationsandboundaryconditionsonlyintermsofstresscomponents.Then,solvetheequationstoobtainthestresscomponentsandcalculatethestrainanddisplacementcomponentsbyusingphysicalandgeometricequations.

答案：【displacementandstrain】15.Displacementbasedmethod:Thecomponentsareusedasthebasicunknownfunctions,andthestressandstraincomponentsareeliminatedtoobtaintheequationsandboundaryconditionsonlyintermsofdisplacementcomponents.Then,solvetheequationstoobtainthedisplacementcomponentsandcalculatethestrainandstresscomponentsbyusinggeometricandphysicalequations.

答案：【displacement】16.indicatesthatifthereisanequilibriumforcesystemactingonalocalregionoftheboundary,thesurfaceforcescanonlyaffectthestressstatearoundthelocalboundary,buthavelittleeffectonthezonesfarawayfromthelocalboundary.

答案：【Saint-VenantPrinciple】17.Boundaryconditionsofelasticbodyinclude,stressboundaryconditions,andhybridboundaryconditions.

答案：【displacementboundaryconditions】18.Theboundaryconditionsareusedtodefinetherelationshipsbetweenandrestrains,orbetweenstressesandsurfaceforces.

答案：【displacements】19.Fortheelasticbodywithtwoormorecontinuousboundaries,theexpressionsofstresscomponentshaveundeterminedterms,whichcanbedeterminedbysatisfyingatthesamepoint.

答案：【singlevalueconditionofdisplacement】20.istheelasticbodywithtwoormorecontinuousboundaries,suchasaring.

答案：【Multipleboundaryelasticbody】4.RectangularCoordinateSolutionofPlaneProblems第四章測試1.單選題：Whenistakenasastressfunctiontosolveplaneproblems,whichofthefollowingfunctionscanbeusedforfunctionsand?

選項(xiàng)：

A、cosinefunctionsofx

B、sinefunctionsofx

C、polynomialsofthethirdpowerofx

D、polynomialsofthefourthpowerofx

答案：【polynomialsofthethirdpowerofx】2.單選題：Ifthefunctionistakenasastressfunction,thecoefficientsshouldsatisfythat().

選項(xiàng)：

A、

B、

C、

D、

答案：【】3.單選題：Forasimplysupportedbeamunderuniformload,whichofthefollowingistherelationshipbetweentheelasticitysolutionandthematerialmechanicssolution?

選項(xiàng)：

A、Theexpressionsofarethesame.

B、Theexpressionsofarethesame.

C、Theexpressionsofarethesame.

D、Theybothsatisfytheplanesectionassumption.

答案：【Theexpressionsofarethesame.】4.單選題：Whenthebodyforcesareconstant,thestresscomponentsofaplaneproblemcanbedeterminedbasedoncompatibleequation,stressboundaryconditionsandequilibriumdifferentialequations,whateverthevaluesoftheelasticconstantsEandμ.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】5.單選題：Ifthefunctionsatisfiesboththeharmonicandbiharmonicequations,,thenthefollowingthreefunctions,,andsatisfythebiharmonicequation.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】6.單選題：Ifthestressfunctionistakenas,thecompatibilityequationisalwayssatisfiedwhateverthevaluesofcoefficientsa,b,c,anddarechosen.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】7.單選題：Thefollowingnon-zerostresscomponentscanexistinanelasticbodywithnobodyforces:,,and,whereand()areconstants,andarefunctionsof.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】8.單選題：Thefunctioncanbetakenasastressfunction.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】9.單選題：Forasimplysupportedbeamunderuniformload,theplanesectionassumptioninmaterialmechanicsisalsovalidinelasticity.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】10.單選題：Foratectangularbeamsubjectedtopurebending,thedeflectioncurvefrommaterialmechanicsisthesameasthatfromelasticity.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】11.單選題：Addingalinearfunctiontothestressfunctionofaplaneproblemwillnotaffectthestresscomponents.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】12.單選題：Forsolvinganelasticityproblem,thestressfunctionisnotrelatedtothechoiceofcoordinatesystem.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】13.Linearstressfunctioniscorrespondingtoanelasticbodywithoutanybodyforces,,orstresses.

答案：【surfaceforces】14.Thestressfunctioncanbeusedtosolvethestresscomponentsofarectangularplatesubjectedto(c>0)oruniformcompression(c<0)inthexdirection.

答案：【uniformtension】15.Thestressfunctioncanbeusedtosolvethestresscomponentsofarectangularplatesubjectedto.

答案：【pureshear】5.PolarCoordinateSolutionstoPlaneProblems第五章測試1.單選題：Forstressconcentrationofasmallholeinthemiddleofawideplate,themagnitudeofstressconcentrationattheedgeoftheholeisindependentof().

選項(xiàng)：

A、loadpattern

B、theshapeofhole

C、thesizeofhole

D、loadmagnitude

答案：【thesizeofhole】2.單選題：Theshapeofthestructureinanaxisymmetricstressproblemis().

選項(xiàng)：

A、circular

B、fan-shaped

C、rectangular

D、arbitraryshape

答案：【circular】3.單選題：Thestresscomponentsintheaxisymmetricstressproblemareindependentof().

選項(xiàng)：

A、x-coordinate

B、y-coordinate

C、tangentialcoordinate

D、radialcoordinate

答案：【tangentialcoordinate】4.單選題：Thecoordinatetransformationformulaofstresscomponentsinrectangularandpolarcoordinatescanbederivedbyconsideringtheforceequilibriumconditionof().

選項(xiàng)：

A、parallelogram

B、rectangle

C、equilateraltriangle

D、righttriangle

答案：【righttriangle】5.單選題：Howmanygeometricequationsofaplaneproblemarethereinpolarcoordinatesystem?

選項(xiàng)：

A、1

B、2

C、4

D、3

答案：【3】6.單選題：Howmanyequilibriumdifferentialequationsofaplaneproblemarethereinpolarcoordinatesystem?

選項(xiàng)：

A、1

B、3

C、2

D、4

答案：【2】7.單選題：Forthestressconcentrationofthesmallholeinaplate,itisassumedthatthesizeoftheholeis_____theelasticbody,andfarawayfromtheboundaryoftheelasticbody.

選項(xiàng)：

A、similarto

B、muchlargerthan

C、muchsmallerthan

D、thesameas

答案：【muchsmallerthan】8.單選題：Thebasicassumptionsusedinderivingtheequilibriumequations,geometricequationsandphysicalequationsinpolarcoordinatesare()thoseusedinthecartesiancoordinatesystem.

選項(xiàng)：

A、fewerthan

B、morethan

C、identicalto

D、oppositefrom

答案：【identicalto】9.多選題：Iftwoelastomersremaininperfectcontactatthecontactsurface,()and()areequalatthecontactsurface.

選項(xiàng)：

A、normalstress

B、radialdisplacement

C、normalstrain

D、tangentialstrain

答案：【normalstress;radialdisplacement】10.多選題：Duetoasmallhole,thestressconcentrationattheedgeoftheholehastwofeaturesincluding(),().

選項(xiàng)：

A、localization

B、globalization

C、uncertainty

D、concentricity

答案：【localization;concentricity】11.多選題：Fortwoelasticcylinderswithcompletecontactattheboundary,theboundaryconditionsofthecontactsurfacescontain:

選項(xiàng)：

A、Radialdisplacementsareequal.

B、Tangentialdisplacementsareequal.

C、Radialstressesareequal.

D、Tangentialstressesareequal.

答案：【Radialdisplacementsareequal.;Tangentialdisplacementsareequal.;Radialstressesareequal.】12.多選題：Inanaxisymmetricstressproblem,()oftheelasticbodymustbeaxisymmetric.

選項(xiàng)：

A、shape

B、stressboundarycondition

C、displacementboundarycondition

D、displacement

答案：【shape;stressboundarycondition】13.多選題：Polarcoordinatesystemisappropriatetoanalyzetheelasticbodieswhichareconstructedby()linessuchascylinder,circularring,wedgeandfan-shapedelasticbodies.

選項(xiàng)：

A、horizonal

B、vertical

C、radial

D、arc

答案：【radial;arc】14.單選題：Foraxisymmetricproblems,thestresscomponentsandthedisplacementcomponentsaregenerallyindependentofthepolarangle.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】15.單選題：Thecompatibleequationintheaxisymmetricstressproblembecomesordinarydifferentialequationaboutthevariable.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】16.單選題：Fortwoelastomersinsmoothcontact,thenormalstressonthecontactsurfaceiscontinuous,theshearstressonthecontactsurfaceiszero,andthesheardisplacementisdiscontinuous.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】17.單選題：Forcircular,wedge,sector,andotherobjects,itismoreconvenienttosolvetheelasticstresscomponentswithrectangularcoordinatesthanpolarcoordinates.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】18.單選題：Thedisplacementinanaxisymmetricstressproblemisalsoaxisymmetric.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】19.單選題：Thepolarcoordinatesystemisanorthogonalcoordinatesystem.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】7.ThinPlateBendingProblems第七章測試1.單選題：Forbendingofathinplate,theexpressionsofandintermsofareobtainedfromthe()

選項(xiàng)：

A、physicalequations

B、equilibriumequations

C、compatibilityequations

D、geometricequations

答案：【equilibriumequations】2.單選題：Thereare()physicalequationsforbendingofathinplate.

選項(xiàng)：

A、3

B、6

C、2

D、4

答案：【3】3.單選題：Forbendingofathinplate,whichstatementisincorrect?

選項(xiàng)：

A、Thedisplacementcomponentsandarelinearlydistributedalongthethicknessoftheplate,zeroattheneutralsurface,andreachtheirextremevaluesatthetoporbottomsurfaceoftheplate.

B、Thestresscomponents,,andareparabolicallydistributedalongthethicknessoftheplate,reachtheirextremevaluesattheneutralsurfaceandarezeroatthetoporbottomsurfaceoftheplate.

C、Thestresscomponents,,andarelinearlydistributedalongthethicknessoftheplate,zeroattheneutralsurface,andreachtheirextremevaluesatthetoporbottomsurfaceoftheplate.

D、Thestraincomponents,,andarelinearlydistributedalongthethicknessoftheplate,zeroattheneutralsurface,andreachtheirextremevaluesatthetoporbottomsurfaceoftheplate

答案：【Thestresscomponents,,andarelinearlydistributedalongthethicknessoftheplate,zeroattheneutralsurface,andreachtheirextremevaluesatthetoporbottomsurfaceoftheplate.】4.單選題：Forbendingofathinplate,thestresses,,andaredistributedalongthethicknessas().

選項(xiàng)：

A、uniformdistribution

B、lineardistribution

C、trapezoidaldistribution

D、hyperbolicdistribution

答案：【lineardistribution】5.單選題：Sidefacesaretheminorboundariesofathinplate,andthedisplacementboundaryconditionscanthenbetransferredtotheconditionsofdeflectionand()oftheneutralsurface.

選項(xiàng)：

A、strain

B、stress

C、rotationangle

D、displacement

答案：【rotationangle】6.單選題：Bendingofathinplateisverysimilartobendingofabeam.Hence,thesecondarystresscomponentsandthestraincausedbythesecondarystresscomponentscanbothbeignored.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】7.單選題：Forbendingofathinplate,sinceand,itfollowsthatand.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】8.單選題：Forbendingofathinplate,itisassumedthat,thusthisproblembelongstotheplanestrainproblem.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】9.單選題：Thoughtheneutralsurfaceofthethinplatebendsintoacurvedsurface,itsprojectiononthexOyplanekeepsthesameasitsoriginalgeometricdimensions.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】10.單選題：Thedistributionsofstressandstraincomponentsalongthethicknessofathinplateunderbendingarethesameasthoseofathinplateunderplanestressstate.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】11.Thetorsionalmomentalongacertainboundarycanbeconvertedinto.

答案：【equivalentshearforces】12.Acertaintwo-wayslabisalwaysdesignedwithconsideringthealongtwodirections.

答案：【bendingmoments】13.Forbendingofathinplate,thebendingandtorsionalmomentsarethemajorinternalforces,andthecanbeneglected.

答案：【transverseshearforces】8.Variationalmethodforplaneproblems第八章測試1.單選題：Ifaplanestressproblemandaplanestrainproblemhavethesamestresscomponent,,and,elasticmodulusandPoisson'sratio,thenthestrainenergydensityoftheplanestressproblemissmallerthanthatoftheplanestrainproblem.

選項(xiàng)：

A、正確

B、錯誤

答案：【錯誤】2.單選題：Thevirtualstrainscanleadtochangeofthestrainpotentialenergy.Andtheforcesorstresseskeepthesameduringtheprocessofvirtualdisplacements.

選項(xiàng)：

A、正確

B、錯誤

答案：【正確】3.單選題：Theequationofvirtualworkindicatesthattheelasticbodyisinequilibriumstatebeforethevirtualdisplacements