LS-DYNA复合材料建模教程.ppt

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1、ModelingofCompositesinLS-DYNASomeCharacteristicsofCompositesOrthotropicMaterialCoordinateSystemUser-definedIntegrationRuleforShellsOutputforCompositesSomeCharacteristicsofSeveralCompositeMaterialModelsinLS-DYNAClosingRecommendationsTwoGeneralClassesofCompositesAdvance

2、dcompositeshavestiff,highstrengthfibersboundinamatrixmaterial.Eachlayer/lamina/plyisorthotropicbynatureasthefibersruninasingledirection.Usually,anadvancedcompositesectionwillhavemultiplelayersandeachlaminawithinthestackwillhavethefibersrunninginadifferentdirectionthan

3、intheadjacentlamina.Asandwichcompositesectionhaslaminaewhichmaybeindividuallyisotropicbutthematerialpropertiesandthicknessmayvaryfromlaminatolamina.Afoamcorecompositeisaparticulartypeofsandwichcompositewhereathick,softlayeroffoamissandwichedbetweentwothin,stiffplies.O

4、rthotropicMaterialsinLS-DYNAOrthotropicmaterialconstantsaredefinedinthematerialcoordinatesystem.Thematerialcoordinatesystemmustbeinitiallyestablishedforeachorthotropicelementand,inthecaseofshells,foreachthrough-thicknessintegrationpointaswell.Thisorientationcomesfromt

5、hreesources.Inthematerialdefinition(*mat)Seedescriptionof“AOPT”inUser’sManualunder*mat_2(orthotropic_elastic)Inthesectiondefinition(*section_shell)A“beta”angleisgivenforeachintegrationpointOptionally,intheelementdefinition(*element_shell_beta,*element_solid_ortho)Orth

6、otropicMaterialsinLS-DYNAAsthesolutionprogressesandtheelementsrotateanddeform,thematerialcoordinatesystemisautomaticallyupdated,followingtherotationoftheelementcoordinatesystem.Theorientationofthematerialcoordinatesystemandthusresponseoforthotropicshellscanbeverysensi

7、tivetoin-planeshearingdeformationandhourglassdeformation,dependingonhowtheelementcoordinatesystemisestablished.Tominimizethissensitivity,“InvarientNodeNumbering”,invokedbysettingINN=2(shells)or3(solids)in*control_accuracyishighlyrecommended.User-Defined(Through-Thickn

8、ess)IntegrationGaussianorLobattointegrationruleshavepre-establishedintegrationpointlocationsandweights(NIP<=10).Lobattoinclu