Hypermesh 110培训word版本2.docx
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Hypermesh 110培训word版本2.docx
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Hypermesh110培训word版本2
Chapter8
AnalysisSetupandLoading
Analysissetupisthedefinitionofallinformationforananalysisbesidesthemeshincluding:
∙Specificationofthesolvertobeused
∙Creationofmaterials,properties,etc.
∙AssignmentofasolverspecificformattoHyperMeshentities
∙Creationofboundaryconditions(constraints,loads,contacts,etc.)
∙Definitionofotherrequiredinformation(solutionrequests,generalrunparameters,etc.)
Section1:
SettingupLoadingConditions
Afiniteelementsolvercansolveforresponsesofpartstoloadingconditionsplacedonthem.Theloadscanbeintheformofanycombinationofboundaryconstraints,forces,pressures,temperatures,etc.Thissectionfocusesondefiningtheloadingconditionsonamodel.
Inthissection,youwilllearnhowto:
∙Createconstraints(RADIOSSSPC)onthechannel’sgeometrylines
∙Createaforce(RADIOSSFORCE)onthebrackettosimulateapressingloadonit
∙Definealoadstep(RADIOSSSUBCASE)
InteractingwithSolvers
∙HyperMeshinteractswithmanysolvers
∙Eachsolverhasitsownuniqueformats,terminology,etc
▪Example:
ComparenodesandelementsinAbaqusandRadioss
∙3nodes
∙2quadelements
∙Format/structureisobviouslydifferent
∙HyperMeshcaninteractwithdifferentsolversusing“templates”
∙TheselectedtemplatetellsHyperMeshwhichsolverthemodelisfor
▪ThetemplatealsotellsHyperMeshhowentitiesareformattedforthatsolver
∙Eachentitymayhaveseveralavailableformatsforthatsolver
∙Eachformathasfieldsthatmakeupitsdefinition
∙Thesefieldsmayneedtohavevaluesenteredbytheuser
∙Example:
AcomponentforRadioss(Linear)canbeaPSHELLorPSOLIDformat
▪PSHELLholdsshellelements,ID=1,material=1,thickness=5.0
▪PSOLIDholdssolidelements,ID=2,material=1
Tools
∙Collectors>CardEdit-or-Collectorstoolbaricon
∙View/editthecardimageofanyentityinthemodel
∙Includesentitiesthatarenotcollectors(nodes,elements,loads,etc.)
∙ModelBrowser
∙RightclickacollectorandselectCardEdit
∙View/editthecardimageoftheselectedcollector
∙Preferences>Graphics
∙templatelabels(type)option
∙Activatethegraphicdisplayednamesoftheentitiesinsolver(template)terminologyinsteadoftheHyperMesh(solverneutral)terminology
∙Helpskeeptrackofwhatisinthemodel
∙Summarypanel
∙Displaysatextwindowwithvariousinformationaboutthemodel
∙Helpstoreviewthemodelandmakesureallinformationhasbeenenteredproperly
Process
1.CreatematerialsandentervaluesintothemusingtheModelBrowserormaterialcollectoricon
.
2.Createpropertiesandentervaluesintothem.Materialcollectorscanbeassociatedwithpropertiesduringcreation.UsetheModelBrowserorpropertycollectoricon
tocreatetheproperties.
3.Createcomponentcollectorsandorganizeentitiesintothem.Propertycollectorscanbeassociatedwithcomponentsduringcreationorpropertiescanbeassigneddirectlytoelements.UsetheModelBrowserorcomponentcollectoricon
tocreatethecomponents.
NOTE:
Steps1-3canbedoneusingtheModelBrowserinasinglestep.Whencreatingacomponentcollectoritispossibletoalsocreateandassociatepropertiesandmaterials.
4.Meshandloadthemodel
5.Createsolverspecificcardsandcontrols.
Whileitisnotrequiredthateventsfollowthesestepsinorder,ifyoufollowthesestepsthenthereisnoneedtogobacktoupdateorassigninformationtocollectorsastherequiredinformationwillalreadybeinplace.
Thissectionwillfocusonthecreationofboundaryconditions.
SupportedEntities:
∙FELoading
oLoads(constraint,force,pressure,moment,temperature,flux,velocity,acceleration)
o
Equations(mathematicallinkbetweennodes)
oContacts
oGroups(definescontactbetweenentities)
oContactSurfs(definesalistofentitiesthatcanbeusedasmasterorslaveinagroup)
∙ReferenceEntities
oSets(asimplelistofaparticulartypeofentity)
oBlocks(alistofentitiescontainedwithinaboxshape)
∙CoordinateEntities
o
Systems(coordinateaxes)
oVectors
∙Plotting
oCurves(X-Ydata)
oPlots(adisplayofcurveswithaxes)
∙OutputRequests
oLoadsteps(combinationsofloadcollectors)
oOutputBlocks(requestoutputfromananalysisforcertainentities)
∙Controlcards(job-level,globalparametersfortheanalysis)
LoadsonGeometry
HyperMeshallowstheusertoplaceloadsongeometrybeforethemeshisevercreated.ThenusingtheBCs>LoadsonGeometrypull-down,thoseloadswillbemappedtotheelementsthatwerecreatedfromthatgeometry.Thisisatimesavingadvantageastheuseronlyneedstopickone,oratmostafew,geometricentitiestoultimatelycreatehundredsoreventhousandsofloadsorconstraints.
Tousethis,changetheentityselectorfromanodeorelementselectiontoageometricselectionsuchassurfsorlines.
Thenafterthepartismeshed,usingtheLoadsonGeometryfunction,theloadswillbeautomaticallymappedtoelementscreatedfromthatgeometry.
Exercise8:
AnalysisSetupandLoading
Thisexercisewillfocusonsettingupamodelforanalysis.Attheendofthisexercise,youwillrunananalysisinRADIOSS.WhilethisexerciseisfocusedonaRADIOSSanalysissetup,themethodsandtechniquesexploredhereareapplicabletoasetupinanysolver.
Step1:
LoadthefileExercise_8_mm.hmandtheRADIOSSBulkDatauserprofile.
Step2:
StudyingtheModel
Thenormalprocessforsettingupananalysiswouldbethesetupofmaterials,propertiesandcomponentsbeforethemeshingofthemodel.Asthisexercisefocusesonlyonanalysissetup,themeshhasalreadybeencreatedforyou.
Thismodelisaquartersegmentofasubmarinepressurehull.Theexercisewillcoverthestepsrequiredtoanalyzethestressonthehullofadecenttoadepthof300metersanddetermineifthehulldesigncanhandlethatpressure.
1.Takeafewminutestofamiliarizeyourselfwiththemodelandgetaconceptofthesizeandscaleoftheparts.
2.Baseduponmeasurementsandknowledgeofhowlargeasubmarineis,whatwouldyouassumetounitsofthismodeltobe?
Nowthatthescaleofthemodelhasbeendetermined,itisimportanttoestablishaunitscheme.Theseareoftendictatedbycorporatestandards,butinthiscaseitwillbeestablishedbytheunitsthatwereusedtocreatethemodel.Forthisanalysis,theMillimeter-Ton-Secondschemewillbeutilized.
Thefirststepinanyanalysisshouldbemodelorganization.Thisfrequentlyoccursbeforethemodelismeshedbutcanbedonepostmeshaswell.
Tomakesureeachstephastheinformationalreadyavailable,theidealorderistocreatematerialsfirst,thenpropertiesandthenfinallycomponentcollectors.
Step3:
ComponentCreationwithMaterial/PropertyAssignment
Componentcollectorsare,aspreviouslydiscussed,usedformodelorganization.OneofthemostlogicalorganizationschemesforthismodelwouldbeacomponentfortheHullelementsandthenanotherfortheRibs.This,ofcourse,isonlyonemethodandcouldbealteredforanynumberoforganizationalreasons.
3.RightclickintheModelBrowserandselectCreate>Component
AdialogboxwillopenthatwillallowforthecreationofacomponentthatcanhavePropertiesandMaterialsassigned
uponcreationortheusercancreatethePropertiesand
Materialsdirectlyfromthiswindow.
4.EnterHullintheName:
field.
5.Assignitauniquecolor.
6.ClickthePropertytab.
Whiletheelements(quadsandtrias)havebeencreated,theyneedtobedefinedasanentitythesolvercananalyze.InthecaseofRADIOSS,these2DelementsaredefinedasPSHELL.CreatingthePSHELLpropertywillgivetheseelementstheirdefinition(cardImage)andwillallowforthedefinitionofthematerialthicknesstheyhave.
7.NameitHull.
8.Pickacolor.
9.ForCardimageselectPSHELL.
10.ClickCreateproperty
ThecardeditingpanelforthePSHELLcardisnowopened.Theonlyvaluethatneedstobeenteredinthiscardis[T],thickness.
11.Setthevaluefor[T]at19.
Thiswillestablishathicknessof19mmforthethicknessofthepressurehullwhenthispropertyisappliedtotheelementsrepresentingthehull.
12.Clickreturn.
TheCreatecomponentdialogboxwillreopen.
13.ClicktheMaterialtab.
14.EnterSteelforthename.
15.ForCardImageselectMAT1(ALinearElasticIsotropicMaterial)
16.Assignitauniquecolor.
17.ClicktheCreatematerialbutton.
18.TheMaterialcardeditingpanelwillopen.
19.Click[E],[NU]and[RHO]toopenthefieldsbeneaththem.
Thesefieldsarethematerialpropertiesforthematerialbeingcreatedandaredefinedasfollows:
Ø[E]Young’sModulus(ModulusofElasticity)
Ø[NU]Poisson’sRatio
Ø[RHO]Density
AsithasbeenestablishedtheMillimeter-Ton-Secondunitschemewillbeutilized,theYoung’sModulusneedstobeintermsofNewton/mm2(MPa)andtheDensityinTon/mm3.Poisson’sratioisunit-lessandisthesamenomatterwhattheunitscheme.
Enterthefollowingvalues
Ø[E]2.4e+5
Ø[NU]0.3
Ø[RHO]7.85e-9
20.
Clickreturn.
Atthispointyoucanseethatanewfieldhasbeencreatedinthemodelbrowser,material,andthenewmaterial,steel,isincludedinit.
TheCreatecomponentdialogboxwillreopen.
21.ClicktheComponenttabagain.
YouwillnotethatthePropertyandMaterialjustcreatedareautomaticallyassigned.
22.ClickCreateandthecomponentwillbeproperlycreated
Step4:
PropertyCreation
Apropertycanbecreatedonitsownwithoutcreatingacomponentatthesametime.Thisisusefullwhenthecomponentshavealreadybeencreated.
23.IntheModelBrowserrightclickands
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