ansys中inistate命令详解.pdf

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1、InitialStateEnhancementinANSYSVersion12.1January18,2010InitialStateTheterminitialstatereferstothestateofastructureatthestartofananalysis.—BydefaulttheinitialstateinANSYSisanundeformed,unstressedstructure.PreviousversionsofANSYSwerelimitedtodefininganelasticstressstate.Thecurrentversion

2、12.1ofANSYShasaddedthecapabilitytodefineinitialstrain,initialplasticstrain,andinitialstress.Thisnewenhancementprovidesavaluablecapabilitytoincorporatearesidualstress/strainstatefrompreviousloadingssuchasmanufacturingprocesses.OneElementPlaneStrainExampleToillustratethenewinitialstatepro

3、cedure,consideraone-elementplanestrainmodelwithBKINplasticity:1.Loadappliedbeyondtheyieldstress,accumulatingplasticstrain.2.Loadremoved,definingaresidualstressstate.3.Additionalloadapplied,accumulatingadditionalplasticstrain.312RepeatingWithInitialStateTheanalysisisrepeatedbydefiningther

4、esidualstressandresidualplasticstrainatpoint2,andapplyingtheloadingtopoint3.—Inthisproblem,theresidualstressandplasticstrainarethesameforallintegrationpoints,sotheycanbeentereddirectlyusingthematerial-basedspecification.—Optionsforapplyinginitialstatetoindividualelements,layers,sectionsan

5、dintegrationpointsexist,andtheinitialstatecanbereadinviaafile.—Notethatthefullstressandplasticstraintensorsmustbedefinedforthisplanestraincaseinthesolutionprocessor:!indicatematerial-basedinitialstateinistate,set,mat,1!defineplasticstraintensorinistate,set,dtyp,epplinistate,defi,all,all,a

6、ll,all,-0.02549,0.02579,-0.000295,0,0,0!definestresstensorinistate,set,dtyp,stressinistate,define,all,all,all,all,0,0,8842,0,0,0RepeatingWithInitialStateTheresultsfromtheinitialstateanalysisareplotted,showingthecomparisonwiththeoriginalanalysis:Residualstress/plasticstrainstatedefinedfor

7、thispointusinginitialstateWritinganInitialStateFileTheinitialstatecanbedefinedmoregenerallybywritingouttheintegrationpointvaluestoatextfile.—TocreateaninitialstatefilefromanANSYSanalysis,entercommandsinsolutionprocessor:!Generateinitialstatefile!FLAG=0donotwrite,=1