一種小變形彈塑性模型及應(yīng)用.pdf

1、南昌大學(xué)碩士學(xué)位論文一種小變形彈塑性模型及應(yīng)用姓名：蘇敏申請學(xué)位級別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：陳良森20080615ABSTRACTThearticleisbasedonalagrangianfiniteplasticitytheoryresearchedbyChenLiangSenettodiscussfurthefly，namelyakindofinfinitesimalelastic—plasticmodelandapplic

2、ationinthetheorywhichisdefinedbytheuseofbackstressinthistheory，andtheelasticresponsefunctionalisassumedtobeafunctionalofbackstress，plasticstrainandaccumulatestrainhistoryAsaresultofthisdefinitionofplasticstain，theelastic

3、responsefunctionalhasaspecialform，itisthisformthatresultsinthatthenormalflowruleofgenerallyacceptedby11’yushin’SPostulateisinfactthekinematicalhardeningruleSincethebackstressisthe“center’’oftheelasticrange，theformofyield

4、functionalshouldberestrictedThediscussionoftheconsequenceof11’yushin’Spostulatehasdetailed，thenecessaryandsufficientconditionisobtainedthenweCallobtaintheevolvementequationofinternalvariableswhenamodelisproposedsomeinter

5、nalvariablesareoftenintroducedtepresenttheinfluenceofplasticstrain，backstessandaccumulatestrain，finallytheconstitutiverelationofthemodleisobtainedanderectfiniteelementformationbasedonthismodlefinally，Iuseaexampletosimula

6、tethisformationwithmatlab，thenwecanobtainanotherfiniteelementformdiffientfromtheformationofChenLiangSen，ThediffienceisthatchangestangentmodulustoconsistenttangentmodulusSoitCallexplaintheformofChenLiangSenItisconsiderdto