ls-dyna复合材料建模教程

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1、ModelingofCompositesinLS-DYNASomeCharacteristicsofCompositesOrthotropicMaterialCoordinateSystemUser-definedIntegrationRuleforShellsOutputforCompositesSomeCharacteristicsofSeveralCompositeMaterialModelsinLS-DYNAClosingRecommendationsTwoGeneralClassesofCompositesAdvancedcomposit

2、eshavestiff,highstrengthfibersboundinamatrixmaterial.Eachlayer/lamina/plyisorthotropicbynatureasthefibersruninasingledirection.Usually,anadvancedcompositesectionwillhavemultiplelayersandeachlaminawithinthestackwillhavethefibersrunninginadifferentdirectionthanintheadjacentlamin

3、a.Asandwichcompositesectionhaslaminaewhichmaybeindividuallyisotropicbutthematerialpropertiesandthicknessmayvaryfromlaminatolamina.Afoamcorecompositeisaparticulartypeofsandwichcompositewhereathick,softlayeroffoamissandwichedbetweentwothin,stiffplies.OrthotropicMaterialsinLS-DYN

4、AOrthotropicmaterialconstantsaredefinedinthematerialcoordinatesystem.Thematerialcoordinatesystemmustbeinitiallyestablishedforeachorthotropicelementand,inthecaseofshells,foreachthrough-thicknessintegrationpointaswell.Thisorientationcomesfromthreesources.Inthematerialdefinition(

5、*mat)Seedescriptionof“AOPT”inUser’sManualunder*mat_2(orthotropic_elastic)Inthesectiondefinition(*section_shell)A“beta”angleisgivenforeachintegrationpointOptionally,intheelementdefinition(*element_shell_beta,*element_solid_ortho)OrthotropicMaterialsinLS-DYNAAsthesolutionprogres

6、sesandtheelementsrotateanddeform,thematerialcoordinatesystemisautomaticallyupdated,followingtherotationoftheelementcoordinatesystem.Theorientationofthematerialcoordinatesystemandthusresponseoforthotropicshellscanbeverysensitivetoin-planeshearingdeformationandhourglassdeformati

7、on,dependingonhowtheelementcoordinatesystemisestablished.Tominimizethissensitivity,“InvarientNodeNumbering”,invokedbysettingINN=2(shells)or3(solids)in*control_accuracyishighlyrecommended.User-Defined(Through-Thickness)IntegrationGaussianorLobattointegrationruleshavepre-establi

8、shedintegrationpointlocationsandweights(NIP<=10).Lobattoinclu