自適應(yīng)有限元位移邊界及弧長(zhǎng)法程序?qū)崿F(xiàn).pdf

1、上海交通大學(xué)碩士學(xué)位論文自適應(yīng)有限元位移邊界及弧長(zhǎng)法程序?qū)崿F(xiàn)姓名：陳肖峰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：王建華2003.1.1ImplementationofDisplacementBoundaryofAdaptiveFEMtheArclengthMethodAbstractBasingonthetechniqueofadaptivemeshgenerationthedatastructureofimplementingdis

2、placementboundaryisprovidedatthesametimethepaperrealizesthealgithmofsolvinglinearequationssetincludingdisplacementboundary.ThealgithmthatusesAdaptiveFiniteElementtosolvetheproblemofdisplacementboundaryisgiven.Thepaperpre

3、sentsanewmethodtoimplementtheElastoplasticFEManalysisofsofteningmaterialsbycombiningthealgithmofadaptivemeshgenerationwiththealgithmofarclengthcontrolprocedures.Theflowtofcombiningthealgithmofadaptivemeshgenerationwithth

4、ealgithmofarclengthcontrolproceduresisoffered.Inthecalculationofbearingcapacityofsoftsoilfoundationitisdisplacementboundarythatthefoundationbearswhenupperstructureisregardedasrigidone.BasingonAFEMimplementingstressbounda

5、rythepaperprovidesthedatastructureofimplementingdisplacementboundarythealgithmofsolvinglinearequationssetincludingdisplacementboundary.Comparedwiththickwalledcylinder’stheeticalsolutiontheresultsshowgoodagreementwhichval

6、idatethealgithm.Usingthisprocedurethedevelopmentofplasticzoneoffoundationunderrigidbaseisstudied.Theresultsaccdwiththeengineeringexperiencewhichfurthervalidatetheprocedure.Inadditiontheprocedureisusedtoanalyzethedistribu

7、tionruleofnmalstressonspadewhilecuttingsoiltheresultsaccdwithresultsoftheexperimentofaliterature.TheseshowthattheAFEMhaspotentialinengineeringapplication.Whenmaterialreachesit’sstrengthlimitwiththeincreasementofdefmation

8、itsstrengthdecreasesgradually.Thisphenomenoniscalledstrainsoftening.FexampleshearsofteningappearsingeomaterialsofCivilEngineeringunderloadtensionfracturesofteningappearsinconcreteundertensilestress.Becauseoftheinfluenceo