资源描述：
《ansys处理粘结问题.doc》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、byRodSchollANSYS10.0introducestheabilitytomodelcohesion.Essentiallythisallowsfortheeasycreationofinitialzero-thicknesselementsbetweentheboundariesofsome“glued”components.Thesezero-thicknesselementswillthenopenupinpeelandshearandeven“letgo”whenamaximumstressisencou
2、ntered.Whatmakesthissuperiortosolidelementswithfailurecriteria,orevencontactelementswithbirthanddeathbasedoncontactresultsandutilizingrestarts,isthattheformulationallowformodelingtheexponentialsurfacepotentialofanadhesiveindeformation.Thus,throughspecifiedcohesion
3、elementmaterialpropertiestheamountofdeformation,andsubsequentload-sharingwithadjacentelementsiscaptured.Thehelpmanualdescribeshowtoinputmaterialpropertiesforthecohesiveregion—andcohesiveelementsaregeneratedprettyeasily:1.DefineelementtypeINTER20Xtomakethecohesivee
4、lementsavailable.2.DefineINTER20Xmaterialpropertiesintermsofmaximumstressandseparationlengthatfailurestress(seematerialsmanual).3.Buildthejointregionline-on-lineandsharenodesalongadefinedseparationsurface.Surfacescanbeidentifiedbyanarea,orbyelementcomponentsoneith
5、erside.4.EnsurethattherearenoMESH200,Shell,Contact,orotherelementssharingnodeswiththecohesivejoint.Theycanbeappliedlater,butcannotbepresentduringthecreationofthecohesiveelementswithoutanerrormessage.5.IssuetheCZMESHcommandreferringtotheelementcomponentsoneithersid
6、e,oranareanumberiftwovolumesshareit.ANSYSthenseparatesthenodesandpaintsthesurfaceswiththeINTER20Xelements.That’sit.Fromthere,youcansolvethemodelnormally.Thereareacouplepostprocessingtermsforepoxyseparationandepoxystress.Thehelpmanualisprettyclearontheirusage,socom
7、binedwiththeattachedexamplescript,tchohesion.mac,youshouldfindimplementationsimple.ModelingStiffEpoxyBystiffepoxy,Irefertosomethingabout0.01"thick,withastiffnessof105psiandmaximumstressof1,000psi.Suchanepoxyonlyexpands0.0001"beforegivingway.Thisscenarioisdifficult
8、toachieveconvergencewithoutresortingtoaveryfinemesh.For2-Dmodels,themeshdensityrequirementsmaynotbesignificant,butfor3-Dmodelsprepareforlongsolvetimes.A
