5 ing with Loads on Geometry.docx
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5 ing with Loads on Geometry.docx
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5ingwithLoadsonGeometry
Navigation:
HyperMesh>HyperMeshTutorials>AnalysisSetup >
WorkingwithLoadsonGeometry-HM-4040
Inthistutorial,youwilllearnhowto:
•
Createloadsandboundaryconditionsongeometry
•
Maptheloadsfromgeometrytoelements
•
Exporttoasolverdeck
•
Modifythemeshandremaptheloadstothenewmesh
Exercise:
WorkingwithLoadsonGeometry
Thisexerciseusesthemodelfile,c-channel0.hm.
C-channelmodelinshadedmode
Step1:
Retrievethemodelfile,c-channel0.hm.
Inthistutorial,youwillexperimentwiththeexportoftheloadsappliedtogeometryentities.Therefore,youwillneedtohaveatemplateloaded.Inthissection,retrievethec-channelmodelandloadtheOptiStructuserprofile.Byloadingthisuserprofile,thetemplatewillbeautomaticallyloaded.Youwillalsoapplysomeconstraints,forcesandpressureloadtoyourmodel,andyouwillneedloadcollectorstoorganizethem.
1.
Openthemodelfilec-channel0.hm.
ThemodelgeometryisofaC-channelwithtworeinforcementribs.Thevarioussurfacesareorganizedintoseveralcomponentcollectors.
2.
FromthePreferencesmenu,clickUserProfiles....
3.
SelectOptiStruct.
4.
ClickOK.
Step2:
Createthreeloadcollectorsforconstraints,forces,andpressureloads.
1.
IntheModelbrowser,right-clickinthewhitespaceofthebrowserlistandclickCreate,thenLoadCollector.
2.
IntheName:
field,typeconstraints.
3.
Selectacolor.
4.
ForCardimage:
selectnone.
5.
ClickCreate.
6.
Similarly,createtwomoreloadcollectorswithnamespressureandforces,assigncolorstothem,andselectnocardimages.
Differentboundaryconditionscannowbecreated.
Definingloadsandboundaryconditionsongeometry.
YoucanapplyloadstogeometricentitiesinawaysimilartothemannerinwhichloadsareappliedtomeshbyusingthefollowingpanelsfromtheAnalysispage:
forces,moments,constraints,pressures,andtemperatures.
Inthisstep,youwillapplyconstraints,pressure,andforcestogeometricentitiesinthemodel.Constrainthebottomportionofthec-channelusinglinedata.Thencreatepressureloadsonthetopsurfaces.Finally,addforcesattheeightcornersofthesurfacesdefiningthetopofthec-channel(seefollowingimage).
Constraintsonlines,pressuresonsurfacesandforcesonfixedpoints
Step3:
Fullyconstrainthebottomeightlinesofthec-channelusingtheconstraintspanelfromtheAnalysispage.
1.
IntheModelbrowserright-clicktheconstraintsloadcollectorandpickMakeCurrent.
2.
FromtheBCsmenu,clickCreate,thenConstraintstoopentheConstraintspanel.
3.
Selectthecreatesub-panel.
4.
Settheentityselectortolines.
5.
Selecttheeightlinesdefiningthebottomportionofthec-channel.
Linestoconstrain
6.
Forsize=,enterthevalue1.
Thisisthesizeoftheiconsthatwillbeusedtorepresenttheconstraintsinthegraphicsarea.
7.
Clearthelabelconstraintscheckbox.
8.
Constraindof1,dof2,dof3,dof4,dof5,anddof6bycheckingtheirrespectiveboxes.
Dofswithacheckwillbeconstrained,whiledofswithoutacheckwillbefree.Dofs1,2,and3arex,y,andztranslationdegreesoffreedom.Dofs4,5,and6arex,y,andzrotationaldegreesoffreedom.
9.
Forloadtypes=,selectSPC.
10.
Clickcreate.
Thisappliestheseconstraintstotheselectedlines.Theydisplayasatriangularicon.Checkingtheboxforlabelconstraintsdisplayswhatdegreesoffreedomareconstrained.
11. Clickreturntoexitthepanel.
Step4:
Applyapressureof25unitsnormaltothetopthreesurfacesusingthepressurespanel.
1.
Setpressureasyourcurrentloadcollectorbyright-clickingitintheModelbrowserandselectingMakeCurrent.
2.
FromtheBCsmenu,clickCreatethenPressurestoopenthePressurespanel.
3.
Selectthecreatesub-panel.
4.
Settheentityselectortosurfsandpickthethreesurfacesdefiningthetopofthec-channel.
Surfacestoapplypressureto
5.
Clickmagnitude=andenterthevalue–25forthepressure.
Specifyinganegativemagnitudeensuresthatthepressureloadispushingdownonthesurfaces.Bydefaultthepressureloadiscreatednormaltothesurfaces.
6.
Togglethedisplayofthepressuresfrommagnitude%=touniformsize=.
Anarrowisusedforthegraphicaldisplayofpressureloads.Thesizeofthearrowcanbeinputasavalueorasapercentageoftheactualpressureloadapplied.Inthisexercise,youwillspecifyitslengthasacertainnumber.
7.
Clickuniformsize=andenterthevalue1.
Thisisthesizethearrowswillhaveinthegraphicsarea.
8.
Clearthelabelloadscheckbox.
Inthisexercise,youwillnotdisplaytheactualvalueofthepressureloadinthegraphicsarea.
9.
Forloadtypes=,selectPLOAD.
10.
Clickcreate.
Thisappliesthepressureloadstotheselectedsurfaces.Theyarerepresentedwithanarrowaswellasalabel.Thislabelcanbetemplatebased(PLOAD4here)orfollowtheHyperMeshterminology(P)asspecifiedinthemodelingsub-paneloftheoptionspanel.
11. Clickreturntoexitthepanel.
Step5:
Createforcesattheeightcornersofthethreetopsurfaces.
1.
IntheModelbrowser,setthecurrentloadcollectortoforces.
2.
FromtheBCsmenu,clickCreatethenForcestoopentheForcespanel.
3.
Selectthecreatesub-panel.
4.
Settheentityselectortopointsandselecttheeightfixedpointsdefiningthecornersofthec-channel’stopsurfaces.
Fixedpointstoapplyforcesto
5.
Setthecoordinatesystemtoggletoglobalsystem.
6.
Clickthevectordefinitionswitchandselectuniformsize=.
7.
Clickuniformsize=andenterthevalue1.
8.
Clearthelabelloadscheckbox.
9.
Clickmagnitude=andenterthevalue–15.
Theminussignisusedtospecifyadirectionoppositetotheoneyouwillselectinthenextstep.
10.
Clickthedirectiondefinitionswitchbelowmagnitude=,andselectz-axis.
11.
Forloadtypes=,selectFORCE.
12.
Clickcreate.
Thiscreatesanumberofpointforces,withthegivenmagnitudeinthez-direction,tobeappliedtothefixedpointsselected.
13.Clickreturntoexitthepanel.
Loadsongeometry
Note:
Ifyousentsomeloadsintothewrongloadcollector,usetheorganizepanelonloadstomovethemintotherightcollector.
Inthissectionyoucreatedvarioustypesofloadsonvariousgeometricentities:
lines,surfacesandfixedpoint.Theultimategoalistohavetheseloadingconditionsappliedtofiniteelements.Youwillnowcreatetheseelements.
Step6:
Generateelementsonthesurfaces.
Usetheautomeshpaneltocreateaquaddominant(mixed)mesh. Theelementsgeneratedwillbeorganizedintotheirsurfaces’componentcollectorstoavoidtheneedofsettingcurrentcomponentcollectors.
1.
PressF12togototheautomeshpanel.
2.
Settheentityselectortosurfs.
3.
Clicksurfsandselectdisplayed.
4.
Forelementsize=,enterthevalue0.25.
5.
Setthemeshtypetomixed.
6.
Clickthetoggletoswitchfromelemstocurrentcomptoelemstosurfcomp.
Thisensuresthattheelementscreatedgointothesurface’scomponentcollector.
7.
Setthemeshingmodetoautomatic.
InthismodeHyperMeshwillautomaticallygenerateameshonthesurfacesbasedontheelementsizeandthetypeofelementsselected.Nofurtheruserinputisrequiredorcanbesupplied.
8.
Clickmesh.
9.
Clickreturntoexitthepanel.
10.
ClickShadedElementsandMeshLines(
).
Meshedc-channel
Inthisstep,youquicklycreatedashellmeshonthesurfaces.Youcannowtrytomaptheloadsthatwereappliedtogeometricentitiesontothesefiniteelements.
Step7:
Maptheloadsfromgeometrytoelements.
Aloadcollector,justlikecomponentcollectors,canstorebothloadsongeometryandloadsonfiniteelements.Thesetwotypesofloadsareseparateandindependent,andcanthereforebemanipulatedindependently.Atthistime,yourloadcollectorscontainloadsonlyintheirgeomside.Bymappingtheseloadsongeometryontofiniteelementsandusingyourexistingloadcols,youwillalsopopulatetheirelemsside.
Inthisstep,usetheloadongeompaneltomaptheloadsfromthegeometricentities(towhichthegeometricloadsareapplied)tothemeshassociatedwiththesegeometricentitiesfortheconstraintsandpressureloadcollectors.
1.
FromtheAnalysispage,selecttheloadongeompanel.
2.
Clickloadcolsandchecktheboxnexttoconstraintsfromthelistofloadcollectors.
3.
Clickselect.
4.
Clickmaploads.
Theconstraintspreviouslyappliedtothelinesarenowalsoappliedtothenodesofthemeshassociatedtotheselines.Theseconstraintsareplacedinthesameloadcollectorastheonesappliedtothegeometry,onlyintheelemsportion.
Constraintsmappedtotheelements
5.
Repeat7.1-7.4tomapthepressureloadcoltothemesh.
Thepressureloadspreviouslyappliedtothesurfacesarenowmappedtothenodesassociatedwiththesesurfaces.Thesepressureloadsareplacedinthesameloadcollectorastheonesappliedtothegeometry.
Step8:
Exportthemodeltoasolverdeck.
Whenexportingthemodelusinganexporttemplate,onlytheloadsonmeshareexported. Theseloadsonmeshmayhavebeenapplieddirectlytothemesh,mappedfromgeometrytothemesh,orboth.TheExporttaballowsyoutoexportloadstoanASCIIsolver-specificfile(accordingtotheloadedexporttemplate). Theloadsareexportedasmeshloads.
TheCustomtemplateallowsyoutodeterminewhichloadsareexported.
Ifallisselected,allth
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