Improving your Structural Mechanics Simulations with ANSYS 14.0

2011ANSYS,Inc. October24,20111

ImprovingYourStructuralMechanicsSimulationswithRelease14.0

ToddMcDevitt,PhDPEProductStrategy&PlanningANSYS,Inc


StructuralMechanicsThemes

MAPDL/WorkbenchIntegration

Physicscoupling

Rotatingmachines

Composites&FractureMechanics

ApplicationCustomization

Thinstructuresmodeling

Contactanalysis

Performance

AdvancedModeling

GeometryHandling

Listeningtoyourneeds,wehavebeenabletoidentifyanumberofthemeswhichformthebasisofourroadmapandguideourdevelopments


WhatwillRelease14.0bringyou?


Letsnowtakeacloserlookatsometopics



FiniteElementInformationAccesswithinANSYSMechanical


SpotWelds

Connectionscreatedinternallyatthesolutionlevelareavailableandcanhelpunderstandtheresults

ReviewingConnections

WeakspringsandMPCcontactsasgeneratedbythesolver


Nodescanbegroupedintonamedselectionsbased onselectionlogic,usinglocationsorothercharacteristics ormanualselections

SelectingNodes

BoxSelection NodePicking LassoSelection


ApplyingLoadsandOrientationstoNodes

NodalOrientationallowsuserstoorientnodesinanarbitrarycoordinatesystem.

DirectFEloadsandboundaryconditions canbeappliedtonodeselections.

Nodesareorientedincylindricalsystemforloadsandboundaryconditiondefinitions


ResultsonNodeSelections

Results aredisplayedonelementsforwhichallnodesareselected.

Nodesnamedselectionsallowtoscopeonspecificregionsofthemeshorremoveundesiredareas.

Resultswithfirstlayerofquadsremoved

Resultsonquadslayersonly


RestartandDirectFELoads

NodalForcesandPressuresobjectscanbeaddedtoarestartanalysis withoutcausingtherestartpointstobecomeinvalid.

Otherloadscannowbemodifiedwithoutlosingtherestartpoints.

AnalysisSettingstabulardata:Norestartpointislost

Addedafterinitialsolve

SecondLoadstepmodifiedforrestart


AvoidResolveswithPostCommands

Addingpostcommandsnippetsafterasolutiondoesnotrequireresolvingtheentiresolution.

Thisisthedefaultsettingiftheuseraddsapostcommandobject.



LinearDynamicsinANSYSMechanical


WorkbenchandMechanicalenhancements

MSUPtransientanalysissupported

PrestressMSUPharmonic

Jointfeaturescannowbeusedinharmonics,randomvibrationanalysis

Reactionforce&momentresultsarenowsupported

ModalSuperpositionTransient

JointsinHarmonicAnalyses

Reaction ForcesinHarmonic Analyses


PhysicsCoupling

DataMapping


Motivation

Engineeringorganizationsoftenuseexternalfilestotransferquantitiesfromonesimulationtoanother.

Efficientmappingofpointclouddataisrequiredtoaccountformisalignment,nonmatchingunitsorscalingissues.


SupportedDataTypes

NewatR14.0


IncreasedAccuracy

Thesmoothness ofthemappeddatadependsonthedensityofthepointcloud.

Severalweightingoptionsareavailabletoaccommodatevariousdataquality.

Triangulation versus Kriging


ValidatingtheMappedData

Visualtoolshavebeenimplementedtocontrolhowwellthedatahasbeenmappedontothetargetstructure


ImportingMultipleFiles

Multiplefilescanbeimportedfortransientanalysesortohandlemappingstomultiplebodies


RotatingMachines

StudyingRotordynamics inANSYSMechanical


Motivation

ANSYSMechanicalusersneedtobeabletoquicklycreateshaftgeometriesaswellasanalyzedynamiccharacteristicsofrotatingsystems

Industrialfan(Venti Oelde)


GeometryCreation

GeometriescanbeimportedfromaCADsystem orimportedfroma simpletextfiledefinitionforpreliminarydesign


Import/ExportofBearingCharacteristics

ANSYSprovidesaninterfacethatallowstoimportbearingcharacteristics fromanexternalfile


CampbellDiagrams

Campbelldiagramsareusedtoidentifycriticalspeedsofarotatingshaftforagivenrangeofshaftvelocities


Composites

EnhancedAnalysisWorkflowandAdvancedFailureModelsforComposites


Motivation

Efficientworkflowsandindepthanalysistoolsarerequiredtomodelandunderstandcomplexcompositesstructures


ManuallyDefiningLayersonSimpleGeometries

Userscandefinesimplelayeredsections forashellbodyaswellasdefinethicknessesandanglesasparameters


DefiningLayersonComplexGeometries

Forcomplexgeometries,theANSYSCompositePrepPosttoolisusedandlayerdefinitionsareimportedintheassemblymodelinANSYSMechanical.

Courtesy ofTUChemnitzandGHOSTBikesGmbH


AdvancedFailureAnalysis

CrackgrowthsimulationbasedonVCCTisavailabletosimulatedelamination.

Progressivedamageissuitablefordeterminingtheultimatestrengthofthecomposite(lastplyfailureanalysis)

2Dlaminarcomposite

Initialcrack

Startofdamage(layer1)

Progresseddamage(layer1)

Progresseddamage(layer3)


Customization

ANSYSDesignAssessment


Motivation

Manyofyouhaveexpressedtheneedfor:ComputinganddisplayingspecificresultsBeabletoachievemorecomplexUserdefinedresults


WhatisDesignAssessment?

TheDesignAssessmentsystemenablestheselectionandcombinationofupstreamresultsandtheabilitytooptionallyfurtherassessresultswithcustomizablescripts


DesignAssessmentforAdvancedUserDefinedResults

DesignAssessmentenableuserstoextenduserdefinedresultscapabilitieswith:

ExpressionsusingmathematicaloperatorsassupportedbyPython

Coordinatesystems,UnitsSystems

Integrationoptions

Nodal,ElementNodal&Elementalresulttypes

ImportfromexternaltablesScriptusedtodisplayscalarelementdatastored

inanexternalfile


ThinStructures

MeshConnections


Motivation

Inordertoconnectmeshesofdifferentsurfacepartssoastosharenodesatintersections,usersdonotalwayswantorcannotmergethetopologiesatthegeometrylevel.Meshbasedconnectionsarerequired.


MeshConnections

Meshconnectionsworkatpartlevel:AsapostmeshoperationBasepartmeshisstoredtoallowforquickchangesinconnections


FurtherMeshingEnhancements


VirtualTopologiesInteractiveEditing

Virtualtopologiesarehandledmoreinteractivelythroughdirectgraphicsinteractionratherthantreeobjects.

UserselectsentitiesthenappliesVToperations

DirectaccesstooperationsfromRMBmenu


VTHardVertex,EdgeandFaceSplits

Hardverticescanbeaddedatanylocationonanedgeoraface.

Hardverticescanthenbeusedtocreatefacesplitsfromvirtualedges.


ContactAnalysis

RigidBody&FlexibleDynamics


Motivation

Manymechanismsandassemblieshavecomponentsthatoperatethroughcontact.


PerformanceImprovements

Valve:158secelapsedtime(2xspeedup)

Piston:9secelapsedtime(7.5xspeedup)

Theapplicability,robustnessandefficiencyofthecontacthasbeenimprovedforspeedandaccuracyexpectatypical25xspeedup

Transitionandjumppredictionhavebeengreatlyimproved


ProjectedContact

Improvedpressureresultswithsurfaceprojection

TheSurfaceProjectionBasedContactprovidesmoreaccurateresults(stresses,pressures,temperatures)andisnowalsoavailableforbondedMPCcontacts

Regularcontact Projectionbased

Smoothertemperatureresultsonamultilayeredstructure


Contactaccuracyandrobustness

ContactstabilizationtechniquedampensrelativemotionsbetweenthecontactandtargetsurfacesforopencontactNewcontact

stabilizationpreventsrigidmotion

Adjusttotouchcausesrigidbodymotionandleavesagap


Performance

FurtherbenefitsfromGPUboards


Takingadvantageofthelatesthardwareismandatorytosolveyourlargemodels.

Acombinationofrelativelynewtechnologiesprovidesabreakthroughmeanstoreducethetimetosolution

Motivation

+


DistributedANSYSSupportsGPUs

2.1MDOF,NonlinearStructuralAnalysisusingtheDistributedSparseSolver

GPUAccelerationcannowbeusedwithDistributedANSYStocombinethespeedofGPUtechnologyandthepowerofdistributedANSYS


SpeedupfromGPUtechnology

SolderJointBenchmark 4MDOF,CreepStrainAnalysis

ResultsCourtesyofMicroConsult Engineering,GmbH

Linuxcluster:Eachnodecontains8IntelXeon5600seriescores,96GBRAM,NVIDIATeslaM2070,InfiniBand

MoldPCB

Solderballs


AdvancedModeling

MaterialModels&Methods


AnisotropicHyperelasticity plusViscoelasticityforstrainrateeffects

Hyperelasticity coupledwith PorePressureelement

ShapeMemoryAlloyenhancedwithsuperelasticity,Memoryeffect,NewYieldFunction,DifferentiatedModuli(Austenite,Martensite)

Holzapfel Model Capturethebehavioroffiberreinforcedtissue

AdvancedMaterialsforBiomechanicalApplications

HydrocephalusanalysisHyperelastic materialwithporousmedia

Stentmodelingusingshapememoryalloys


Nonlinearmaterialssupportforcoupledfieldelements

Coupledfieldelementsforstronglycoupledthermomechanicalanalysisnowaccountsforplasticityinducedheatgenerationalongwithfrictioneffects

FrictionStir Welding includingheatgenerationduetofrictionandplasticdeformation


MoistureDiffusion

Moistureinduceshygroscopicstressesandaltersthermalstresses.

Coupledfieldelementsallowtoincorporatemoistureeffectsinthermal,structuralandcoupledsimulations.


AdvancedNonlinearMethods

Usercannowperform:Bucklingfromanonlinearprestressedstate withdeadloads(newsubspaceeigensolver)

3Drezoning forverylargedeformationsforawiderrangeofmaterialsandboundaryconditions.

HotRollingStructuralSteelAnalysiswith3DRezoning

Bucklingofaprestressedstiffenedcontainer


Coupledstructures/acousticssimulations

Coupledproblemsaremodeledmoreefficiently:QuadratictetrahedralacousticselementsNewacousticssourcesAbsorbingareasEnhancedPMLformulation Nearandfarfieldparameters


AdvancedModeling

BrakeSqueal


ComplexEigensolve Animate:ComplexModeShape ContactStatusatPads

ANSYSSolutionforBrakeSqueal

CAD Mesh&ConnectionSetup&solver

PostProcessing

BiDirectionalCADConnectivity

AutomatedContactDetection

Providesforslidingcontactwithfriction Nomatchmeshneeded Supportshigherorderelements AutomatedMeshing

FlexibilitytouseLinear&Nonlinearsolvercapabilities

Rootlocusplots Correlationofmodes ListStrainenergypercomponentpermodeFrictionsensitivitystudy

Physicalprototypingtimeconsumingandexpensive Providemoreanalysisearlyinthedesigncycle ParametricStudybychangingfrictioncoefficient

RunsetofDOEs Reusesymmetricmodesandjustrununsymmetricpart Significanttimereduction

CanIncludeSquealandContactdamping Slidingvelocity

dependentFriction


PhysicsCoupling

SystemOptimizationwithRigidBodyDynamicsandSimplorer cosimulation


Motivation

Mostmechanismsandassembliesaremanagedviacontrolsystems.

Systemsimulation,includingthedetailsofthemechanismorassembly,areneededinordertoimprovemodelingaccuracy,fidelityandultimatelysystemoptimization.


LinkingMechanicalandSimplorer

InputsandoutputsaredefinedaspinsintheMechanicalmodelandconnectedtotheschematicsofSimplorer


SomeExamples

AircraftLandingGear

Simplorer schematicofhydrauliccircuitandcontrol

RBDmodel

RoboticArmControl

Traceofarmtrajectory


Andthereismuchmore


checktheReleaseNotes!


ThinkalsooftheTechnologyDemonstrationGuide


Questions?


Appendix


Customization

ApplicationCustomizationToolkit


Motivation

AsaMechanicalUser,youmaywantto: CustomizemenusCreatenewloadsandboundaryconditionsCreatenewtypesofplotsReuseAPDLscriptswithoutcommandsnippets


WhatistheApplicationCustomizationToolkit?

TheApplicationCustomizationToolkit isatoolthatfacilitates customizationofANSYSMechanical.

ItprovidesawaytoextendthefeaturesofferedbyANSYSproducts.


ToolbarCustomizationthroughXMLFiles

1

Convection_Blade_Computation

XMLdefinition:


PythonDrivenLoadsandBoundaryConditionsPythonscript:

#Get thescoped geometry:propGeo =result.GetDPropertyFromName("Geometry")refIds =propGeo.Value

#Get therelated mesh andcreate thecomponent:forrefId inrefIds:

meshRegion =mesh.MeshRegion(refId)elementIds =meshRegion.Elementseid =aap.mesh.element[elementIds[0]].Idf.write("*get,ntyp,ELEM,"+eid.ToString()+",ATTR,TYPE\n")f.write("esel,s,type,,ntyp \ncm,component,ELEM")

#Get properties from thedetails view:propThick =load.GetDPropertyFromName("Thickness")thickness=propThick.ValuepropCoef =load.GetDPropertyFromName("FilmCoefficient")film_coefficient =propCoef.ValuepropTemp =load.GetDPropertyFromName("AmbientTemperature")temperature=propTemp.Value

#Inserttheparameters fortheAPDLcommands:f.write("thickness="+thickness.ToString()+"\n")f.write("film_coefficient="+film_coefficient.ToString()+"\n")f.write("temperature="+temperature.ToString()+"\n")

#Reuse thelegacy APDLmacros:f.write("/input,APDL_script_for_convection.inp\n")


WritingAPDLCommandsFromtheNewDefinition

!APDL_script_for_convection.inp

!Inputparameters:esel,s,type,,10cm,component,ELEMthickness=1.1film_coefficient =120.temperature =22.

!Treatment:/prep7et,100,152keyop,100,8,2.et,1001,131keyo,1001,3,2sectype,1001,shellsecdata,thickness,10secoff,midcmsel,s,componentemodif,all,type,1001emodif,all,secnum,1001type,100esurffinialls/soluesel,s,type,,100nslesf,all,conv,film_coefficient,temperaturealls

APDL

WBMechanical


AnExample:ACTdrivenSubmodeling

Userssimplyselectthecoarsemodelsresultsfile,allAPDLcommandsareautomaticallycreated nomoreneedforcommandblocks!


AdvancedModeling

OffshoreStructures


OvertheperiodofthedesignofanoffshorestructurefromConceptthroughFEEDandDetailedStructuralandEquipmentDesign thereareneedsformanydifferentanalysesrelatedtoglobalstructuraldesignandintegrityanddetailedcomponentlevelanalysis.Toensuredeliverytimeliness,andreliabilitywherecostsoffailurearesohigh,thereisconsiderablevalueincompatibilitybetweentherespectivetools.ThisisdeliveredbytheongoingintegrationofANSYSAQWAinWorkbenchanddeliveryofenhancedcapabilitiesinMechanical/MAPDLforoffshorestructuresanalysis.

Importantly,ANSYSStructuralMechanicsproductsnowdelivertheabilitytoconductbothglobalanddetailedanalysisofoffshorestructuressubjectedtovariouswaveandenvironmentalloadings.

GlobalOffshoreStructures

Localjointflexibilityanalysis

Globalhydrodynamicsandstructuralanalyses


HydrodynamicTimeResponsesystemenhancementsinclude Fenders(similartocontact)

Allowsconnectionsbetween2structuresorbetweenastructureandafixedpoint

Articulations(similartojoints)

FurtherAQWAIntegrationinWorkbenchforMultiBodyWaveHydrodynamics

Offloadingarmrepresentedwithseriesoftypicalarticulations


EnhancedEnvironmentalConditionsandCableBehaviorinAQWA

Introductionofmultidirectionalwavespectraallowsmorerealisticmodellingofrealwaveconditions,andisimportantfortheaccuratesimulationofmooredvesselsandoffshoreplatforms AlmostanycombinationofwavespectratobemodelledinthesolvermodulesLIBRIUM,DRIFTandtheHydrodynamicTimeResponsesysteminWorkbench

TomeetAPIstandard(RP2SK),nonlinearaxialstiffnesscanbeusedtodefineamooringline

GaussianformulatedwavespectrumnowavailableinthecoresolverandtheHydrodynamicTimeResponsesystem


Diffractedwaveloading ProvidessimplifiedpressureloadingfromHydrodynamicsDiffractionsystems(AQWA)ontoMAPDLsystem

HarmonicWaveLoading Regularwaveloadingnowavailableforharmonicresponseanalyses

ANSYSFATJACK(forbeamjointfatigueofframedstructures)automaticallyreadstheRSTfiledataforharmonicloadcases

ANSYSBEAMCHECK(formemberchecksonframedstructures)andANSYSFATJACKnowdeliveredwithMechanicalinstallation SeeDesignAssessmentforfurtherinformation

ExtendedWaveLoadinginMechanicalandlinkstoRegulatoryCodeChecks

VesselLoadingTransferfromAQWAtoMechanicalCourtesyofVuyk EngineeringRotterdam


Aeroelastic coupling(forwindturbinesupportstructures) Sequential

Allowingstructural(ANSYS)andaeroelastic (3rdparty)analysestoberunindependently

JustuseaprovidedMAPDLmacrotowriteoutinputdatafortheaeroelastic analysis

Fullycoupled Cosimulationofstructuralandaeroelastic tools CustombuildofMAPDLrequired,withamacrotomanagethedataavailabilityfromandtoMAPDL

CouplingMechanicalwith3rd PartyAeroelastic ToolsforOffshoreWindTurbineModeling

ImagesCourtesyofREpower SystemsAG

Improving your Structural Mechanics Simulations with ANSYS 14.0

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