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SOME BASIC CONCEPTS OF ENGINEERING ANALYSIS

ValueproblemsAnalysisofdiscretesystems:e xampleanalysisofaspringsystemBasicsoluti onrequirementsUseandexplanationofthemode rndirectstiff nessmethodVariationalformulationTEXTBOOK : Thefiniteelementmethodisnowwidelyusedfor analysisofstructuralengineeringproblems. 'ncivil,aeronautical,mechanical,ocean,mi ning,nuclear,biomechani cal,.. ENGINEERING Sincethefirstapplicationstwodecadesago,- wenowseeapplicationsinlinear,nonlinear, variouscomputerprogramsareavailableandin significantuseMyobjectiveinthissetoflect uresis: tointroducetoyoufiniteelementmethodsfort helinearanalysisofsolidsandstructures.

in linear, nonlinear, static and dynamic analysis. - various computer programs are available and in significant use Myobjective in this set of lectures is: • to introducetoyou finite element methods for the linear analysis ofsolids and structures. ["Iinear"meaning infinitesi­ mally small displacements and linear elastic material proeer­

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Transcription of SOME BASIC CONCEPTS OF ENGINEERING ANALYSIS

1 ValueproblemsAnalysisofdiscretesystems:e xampleanalysisofaspringsystemBasicsoluti onrequirementsUseandexplanationofthemode rndirectstiff nessmethodVariationalformulationTEXTBOOK : Thefiniteelementmethodisnowwidelyusedfor analysisofstructuralengineeringproblems. 'ncivil,aeronautical,mechanical,ocean,mi ning,nuclear,biomechani cal,.. ENGINEERING Sincethefirstapplicationstwodecadesago,- wenowseeapplicationsinlinear,nonlinear, variouscomputerprogramsareavailableandin significantuseMyobjectiveinthissetoflect uresis: tointroducetoyoufiniteelementmethodsfort helinearanalysisofsolidsandstructures.

2 ["Iinear"meaninginfinitesi mallysmalldisplacementsandlinearelasticm aterialproeer ties(Hooke'slawapplies)j toconsider-theformulationofthefiniteelem entequilibriumequations-thecalculationof finiteelementmatrices- methodsforsolutionofthegoverningequation s- , 3 SomebasicconceptsofengineeringanalysisRE MARKS Emphasisisgiventophysicalexplanationsrat herthanmathe maticalderivations Techniquesdiscussedarethoseemployedinthe computerpro gramsSAPandADINASAP==StructuralAnalysisP rogramADINA=AutomaticDynamicIncrementalN onlinearAnalysis Thesefewlecturesrepresenta verybriefandcompactintroductiontothefiel doffiniteelementanalysis Weshallfollowquitecloselycertainsections inthebookFiniteElementProceduresinEngine eringAnalysis,Prentice-Hall,Inc.]

3 ( ). -~modelofphysicalproblem1I:I,-__S_ol_v_e _th_e_m_o_d_el__I~~- - -iL-_I_n_te_r.;.. (refine)themodel?1-4 SolIebasicconceptsofengiDeeringanalysis1 0ft15ftI12at15 ,. ~~~~~-~,-Fault\\(norestraintassumed)Alte red'gritE=toEc., WoE~~;;C= 6 SolDebasicconceptsofengineeringanalysisS egmentofa ,WppPINCHEDCYLINDRICALSHELLOD;:..,.. ~~~~~~CEtW-50P-100-150 16x16 MESH-200-DISPLACEMENTDISTRIBUTIONALONGDC OFPINCHEDCYLINDRICALSHELL ""= ~CBENDINGMOMENTDISTRIBUTIONALONGDCOFPINC HEDCYLINDRICALSHELL1-7 SoBlebasicconcepts01engineeringanalysisI Finiteelementidealizationofwindtunnelfor dynamicanalysisSOMEBASICCONCEPTSOFENGINE ERINGANALYSIST heanalysisofanengineeringsystemrequires.

4 - idealizationofsystem- formulationofequili briumequations- solutionofequations- interpretationofresults1 8 SYSTEMSS omebasicconceptsofengineeringanalysisDIS CRETE responseisdescribedbyvariablesatafiniten umberofpointssetofalge braic--equationsCONTINUOUS responseisdescribedbyvariablesataninfini tenumberofpointssetofdiffer entialequationsPROBLEMTYPESARE STEADY-STATE(statics) PROPAGATION(dynamics) EIGENVALUEF ordiscreteandcontinuoussystemsAnalysisof complexcontinu oussystemrequiressolutionofdifferentiale quationsusingnumericalproceduresreductio nofcontinuoussystemtodiscreteformpowerfu lmechanism:thefiniteelementmethods,imple mentedondigitalcomputersANALYSISOFDISCRE TESYSTEMSS tepsinvolved:- systemidealizationintoelements- evaluationofelementequilibriumrequiremen ts- elementassemblage- solutionofresponse1 9 SomebasicconceptsofengineeringanalysisEx ample.

5 Steady-stateanalysisofsystemofrigidcarts interconnectedbyspringsPhysicallayoutELE MENTSU1U3I~:~\l)..F(4)..31F(4)k,u1- F(')1-1]["1].[F14']-,'4[1u2-11UF(4)33-F( 2)F(2)---2,'2 [1-1]["I]fF}]1uF(2)--122F(S)F(S)23u,u2-t ][F(5l]'5[1k3F(3)1u2=F1S)-1-----233F(3), -r1]fPl]'3[ ]-11uF(3)221 10 SolIebasiccOIceplsofengineeringanalysisE lementinterconnectionrequirements:F(4)+F (S)=R333 TheseequationscanbewrittenintheformK U= U=R(a)+k4k1+k2+k3~-k2- k3UT=[u-1RT=[R-1 '"..K=-k2- k3~k2+k3+kS~-kS ..1 11 Somebasicconceptsofengineeringanalysisan dwenotethat~=t~(i)i=1where::] (a)1 12 Somebasicconcepls01engineeringanalysisu.

6 ::..~..u, ::..K= .. :.K~ ~~.~ ~~ :..~ \fl--r/A~,1\1\1\~~r/A1 13 SOlDebasicconceptsofengineeringanalysis ..::..u, . 'O ..K=u,+K4;K1+K2+ K3;-K2-K3 .'O'O'O'O'O'O'O'O'O'O'O'O'O'O'O'O'O:'O'O 'O'O'O'O'O'O'O'O'O'O'O'O:'O'O'O'O'O'O'O' O'O'O'O'O'O'O ..K= .'O'O ..+K4;K1+K2+ K3~-K2-K3-K4'O'O K=-K2-K3~K2+K3+K5-K5'O'O : u,IK1 14 SomebasicconceptsofengineeringanalysisIn thisexampleweusedthedirectapproach;alter nativelywecouldhaveuseda :u=strainenergyofsystemW=totalpotentialo ftheloadsEquilibriumequationsareobtained froman-0(b)~-1 IntheaboveanalysiswehaveU=~UT!

7 !!W=UTRI nvoking(b)weobtainK U=RNote:toobtainUandWweagainaddthecontri butionsfromallelements1 15 SOlDebasicconceptsofengineeringanalysisP ROPAGATIONPROBLEMS maincharacteristic:theresponsechangeswit htime~needtoincludethed'Alembertforces:F ortheexample:m,aaM=am2aaam3 EIGENVALUEPROBLEMS weareconcernedwiththegeneralizedeigenval ueproblem(EVP)Av=A Bv!l,.!laresymmetricmatricesofordernvisa vectorofordernAisascalarEVPsariseindynam icandbucklinganalysis1 16 SomebasicconceptsofengineeringanalysisEx ample:systemofrigidcarts~lU+KU=OLetU=<ps inW(t-T)Thenweobtain_w2~~sinW(t-T)+K<psi nW(t-T)=0---HenceweobtaintheequationTher eare3 solutionsw,,~,(l)2'~2eigenpairsw3'~3 Ingeneralwehavensolutions1 17 MIT OpenCourseWare Resource.

8 Finite Element Procedures for Solids and Structures Klaus-J rgen Bathe The following may not correspond to a particular course on MIT OpenCourseWare, but has been provided by the author as an individual learning resource. For information about citing these materials or our Terms of Use, visit.

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