[工学]nx_cae讲座

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1、NXCAE讲座之陆海燕高级技术顾问西门子产品管理软件公司——NXAdvancedFEM+Nastran结构分析linearstaticsolutionLinearstaticanalysisisusedtodeterminethedisplacements,stresses,strains,andforcesinstructuresorcomponentscausedbystaticloads.Elementsthatcanbeusedforalinearstaticanalysisinclude:3Dtet

2、rahedralorhexahedralsolidelements2Dquadrilateralortriangularthinshellelements1Dbar,beam,rod,rigidlink,andspringelements0DconcentratedmasselementsGapelementsIsotropicmaterialpropertiesarethesameinalldirections.Orthotropicmaterialpropertiesaredefinedrelativet

3、othreeperpendiculardirections.Anisotropicmaterialsalsohavepropertiesthatdependondirection.Whenananisotropicmaterialisfullydefined(21independentelasticconstants),thereiscouplingbetweentheshearandnormaltermsandbetweentheshearterms.Fluidmaterialsdefinematerial

4、propertiesforliquidsandgases.Hyperelasticmaterialsspecifymaterialpropertiesforuseinafullynonlinearhyperelasticanalysis.Naturalfrequenciesandmodeshapesaretheprimaryresultsforamodalsolution.Theresultsareorderedbyfrequency,withthelowestnaturalfrequencybeingthe

5、firstmodeshape,thenexthighestbeingthesecondmode,andsoon.Thenormalmodesrepresentdynamicstatesinwhichtheelasticandinertialforcesarebalancedwhennoexternalloadsareapplied.Themagnitudeofthemodeshapesisarbitrary.Theamplitudeofthedisplacementisnotsignificant,butth

6、erelativedisplacementofthenodesissignificant.Modeshapeshelpyoudeterminewhatloadlocationsanddirectionswillexcitethestructure.Thermalanalysis:Canverifythedesignofapartthatmustfunctionoverabroadrangeoftemperatures.Cansimulateconduction,convection,andsimpleradi

7、ation.Thereisnoviewfactorcalculation.Assumesasteadystate,meaningthattemperaturesdonotvarywithtime.Materialsusedinthermalanalysisincludepropertiessuchasthefollowing:ReferenceTemperature—UsethistocalculatethedeltaTusedwiththethermalexpansioncoefficient.Ifrefe

8、rencetemperatureisnotspecified,thedefaultsolutiontemperatureisused.ThermalExpansionCoefficient—Usethisifyouplantocalculatethermalstraininalaterlinearstaticanalysis.ThermalConductivity—Usethistocalculat