欢迎来到人人文库网! | 帮助中心 人人文库renrendoc.com美如初恋!
人人文库网
首页 人人文库网 > 资源分类 > PDF文档下载

外文翻译--基于三维有限元方法的AZ31镁合金等通道弯角挤压的模具结构设计 英文版.pdf

  • 资源大小:1.77MB        全文页数:10页
  • 资源格式: PDF        下载权限:游客/注册会员/VIP会员    下载费用:5
游客快捷下载 游客一键下载
会员登录下载
下载资源需要5

邮箱/手机号:
您支付成功后,系统会自动为您创建此邮箱/手机号的账号,密码跟您输入的邮箱/手机号一致,以方便您下次登录下载和查看订单。注:支付完成后需要自己下载文件,并不会自动发送文件哦!

支付方式: 微信支付    支付宝   
验证码:   换一换

友情提示
2、本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--基于三维有限元方法的AZ31镁合金等通道弯角挤压的模具结构设计 英文版.pdf

ANGULARCHINARECEIVED5SEPTEMBER2008ACCEPTED17JANUARY2009AVAILABLEONLINEXXXXKEYWORDSAZ31MAGNESIUMALLOYEQUALCHANNELANGULAREXTRUSIONFINITEELEMENTMETHODFINEGRAINEDMICROSTRUCTURESINMAGNESIUMALLOYSITISCRUCIALTOUNDERSTANDTHEEFFECTOFDIEDESIGNONTOOBTAINTHESEMATERIALSWITHHIGHSTRENGTHANDTOUGHNESSINECAE,AWORKPIECEISPRESSEDTHROUGHADIETHATCONTAINSTWOCHANNELSWITHEQUALCROSSSECTIONMEETINGATANANGLEBECAUSETHECROSSSECTIONOFTHEWORKPIECEREMAINSTHESAMEDURINGEXTRUSION,THEPROCESSCANBEREPEATEDUNTILTHEACCUMULATEDDEFORMATIONREACHESADESIREDLEVELHIGHSTRAINCANBEACHIEVEDFINITEELEMENTMETHODISONEOFTHEIMPORTANTAPPROACHESTOUNDERSTANDTHEOFBACKPRESSUREBYSONETAL,THEOPTIMUMDIEDESIGNFORHOMOGENEOUSPLASTICDEFORMATIONBYYOONSCETAL7HOWEVER,THESESTUDIESASSUMEDTWODIMENSIONAL2DAPPROXIMATIONOFPLANESTRAINCONDITIONANDDONOTDISCUSSTHEINHOMOGENEITYOFSTRESSANDSTRAINRESULTSOBTAINEDBY2DANALYSISGIVELIMITEDINFORMATION,INADDITIONTOTHEINHERENT2DAPPROXIMATIONERRORSSOMERESEARCHERS8–10HAVEEXPLOREDTHEECAEPROCESSUSINGTHREEDIMENSIONS3DPLASTICITYTHEORETICANDSIMULATIONSOFTWARELUISPREZANDLURI11USEDUPPERBOUNDMETHODTOANALYZEINTHREEDIMENSIONSECAEDIESFORRECTANGULARORSQUARECROSSSECCORRESPONDINGAUTHORFAX862368851783MATERIALSANDDESIGNXXX2009XXX–XXXCONTENTSLISTSAVAILABLEANDARTICLEINPRESSEMAILADDRESSHHJCQITEDUCNHJHU1INTRODUCTIONULTRAFINEGRAINEDMATERIALSHAVEBEENWIDELYINVESTIGATEDDUETOTHEIRIMPROVEDMECHANICALPROPERTIESSUCHASHIGHSTRENGTHANDDUCTILITYVARIOUSTECHNIQUESHAVEBEENDEVELOPEDTOOBTAINULTRAFINEGRAINEDMATERIALSSEVEREPLASTICDEFORMATIONSPDTECHNIQUES,LIKEEQUALCHANNELANGULAREXTRUSIONECAE,HIGHPRESSURETORSIONHPT,CYCLINGCHANNELDIECOMPRESSIONCCDCANDACCUMULATIVEROLLBONDINGARBAREMOSTCOMMONLYFORPRODUCINGSUBMICRONGRAINSTRUCTURESINMETALLICMATERIALSATARELATIVELYLOWCOSTAMONGTHEM,THEEQUALCHANNELANGULAREXTRUSIONECAE,ORIGINALLYDEVELOPEDBYSEGAL,ISONEOFTHEMOSTEFFECTIVEMETHODSDEFORMATIONOCCURRINGINTHEECAEPROCESSMANYFEMBASEDANALYSESHAVEBEENPERFORMEDTODETERMINETHEDEFORMATIONBEHAVIOROFMATERIALSANDTOESTIMATETHEDEVELOPEDSTRAININTHEECAPPROCESSTHESERESEARCHWORKINCLUDETHEEFFECTOFCHANNELANGLEANDOUTERCORNERFORFRICTIONLESSCONDITIONBYRAGHAVANS1,THEEFFECTOFCHANNELANGLEANDOUTERCORNERBYKIMETAL,THEEFFECTOFOUTERCORNERONINHOMOGENEITYBYSUHJYETAL2,THECORNERGAPFORMATIONANDITSEFFECTBYKIMANDKIM3,THEEFFECTOFCHANNELANGLEANDCORNERANGLEONMATERIALFLOWBYLANGANDSHYONG4,THEEXTENSIVEWORKONDIFFERENTMATERIALMODELS,OUTERCORNERANGLEANDCOEFFICIENTOFFRICTIONBYLEESCETAL5,THEWORKONORIGINOFINHOMOGENEOUSBEHAVIOROFMETALBYWEIETAL6,THEEFFECTOUTERCORNERANGLEDEFORMATIONINHOMOGENEITY02613069/SEEFRONTMATTERC2112009PUBLISHEDBYDOI101016/JMATDES200901022PLEASECITETHISARTICLEINPRESSASHUHJ2009,DOI101016/JMATDES200901022THEDEFORMATIONBEHAVIOR,STRAINDISTRIBUTIONANDLOADREQUIREMENTINTHEPAPERNEWTHREEDIMENSIONAL3DGEOMETRICMODELSWITHDIFFERENTCORNERANGLES90C176,120C176ANDWITHORWITHOUTINNERROUNDFILLETSINTHEBOTTOMDIEWEREDESIGNEDSOMEIMPORTANTPROCESSPARAMETERSWEREREGARDEDASTHEINITIALANDBOUNDARYCONDITIONSUSEDINDEFORMTM3DSOFTWARESUCHASTEMPERATURESOFTHEDIEANDBILLET,THEFRICTIONCOEFFICIENT,ETCTOENSURETHECONVERGENCEOFTHESIMULATION,THEGEOMETRICALANDDISPLACEMENTCONDITIONSANDREASONABLECONVERGENCEERRORLIMITS,ETCHAVEBEENCONSIDEREDTHEDEFORMATIONHETEROGENEITYOFECAEWASANALYZEDFROMTHESIMULATIONANDEXPERIMENTALRESULTSTHEDEFORMATIONHOMOGENEITYCAUSEDBYFILLETSATOUTERCORNERWASIMPROVEDCOMPARINGWITHTHEDIEWITHOUTFILLETSTHECUMULATEMAXIMUMSTRAINSDECREASEDWITHTHEFILLETSOFOUTERCORNERMANUFACTUREDINECAEDIEANDTHEINNERCORNERANGLESINCREASINGTHEREQUIREMENTEXTRUSIONFORCEDECREASEDWITHTHEFILLETSMADEATOUTERCORNERANGLEINECAEDIETHEANALYSESSHOWEDTHATBETTERSTRUCTURESOFECAEDIEINCLUDEDAPPROPRIATEOUTERCORNERFILLETSANDTHEINNERCORNERANGLE90C176ITWASDEMONSTRATEDTHATTHEPREDICTEDRESULTSWEREINGOODAGREEMENTWITHEXPERIMENTSANDTHETHEORETICALCALCULATIONANDTHERESEARCHCONCLUSIONSFROMOTHERLITERATURESC2112009PUBLISHEDBYELSEVIERLTDARTICLEHISTORYEQUALCHANNELANGULAREXTRUSIONECAEISWIDELYINVESTIGATEDBECAUSEOFITSPOTENTIALTOPRODUCEULTRATHEDIESTRUCTUREDESIGNOFEQUALCHANNELMAGNESIUMALLOYBASEDONTHREEDIMENSIONALHUHONGJUNA,,ZHANGDINGFEIA,B,YANGMINGBOCANATIONALENGINEERINGRESEARCHCENTERFORMAGNESIUMALLOYS,CHONGQINGUNIVERSITY,CHONGQINGBCOLLEGEOFMATERIALSSCIENCEANDENGINEERING,CHONGQINGUNIVERSITY,CHONGQING400045,CCOLLEGEOFMATERIALSSCIENCEANDENGINEERING,CHONGQINGINSTITUTEOFTECHNOLOGY,CHONGQINGARTICLEINFOABSTRACTMATERIALSJOURNALHOMEPAGEWWWELSEELSEVIERLTDETALTHEDIESTRUCTUREDESIGNEXTRUSIONFORAZ31FINITEELEMENTMETHOD400044,CHINA400050,CHINAATSCIENCEDIRECTDESIGNVIERCOM/LOCATE/MATDESOFEQUALCHANNELANGULAREXTRUSIONFORAZ31JMATERDESIGNTIONWHEREBOTHINTERNALANDEXTERNALRADIIWERETAKENINTOACCOUNTANDTHEINTERSECTIONANGLEWASMADETHE3DSIMULATIONANALYSISOFECAPWASPERFORMEDBYCHUNGETAL12USINGACOMMERCIALFINITEVOLUMEMETHODFVMCODETOANALYZETHEEFFECTIVESTRAINANDSTRESSFORONEPASSOFTHEPROCESS3DFEMWASAPPLIEDTOANALYZETHECOMMERCIALPURETICPTIBILLETSUBJECTEDTOFOURPASSNOMENCLATUREUTHEINNERCORNERANGLEC176ESTRAINMM/MMECCRITICALSTRAINMM/MMWTHEOUTERCORNERANGLEC1762HJHUETAL/MATERIALSANDDESIGNARTICLEINPRESSECAEPROCESSAT400C176CWITHBCROUTEINREF13BUTTHEREWEREFEWRESEARCHERSADOPTED3DSIMULATIONTECHNOLOGIESTOINVESTIGATETHEDEFORMATIONBEHAVIORSOFMAGNESIUMAZ31ESPECIALLYTHEINFLUENCESOFDIESTRUCTURESONSTRAINDISTRIBUTIONSANDEXTRUSIONQUALITYMANYOFTHEEARLYSTUDIESOFECAPWERELIMITEDTOTHEPROCESSINGOFSOFTPUREMETALSORSOLIDSOLUTIONALLOYSMORERECENTLY,SIGNIFICANTATTENTIONHASBEENDEVOTEDTOTHEPRESSINGOFMORECOMPLEXALLOYSANDSOMEMETALSWITHLIMITEDNUMBERSOFSLIPSYSTEMSESPECIALLYFORMAGNESIUMALLOYSFORTHESEDIFFICULTTOWORKMATERIALS,THREEDIFFERENTSTRATEGIESHAVEBEENADOPTEDWITHTHEOVERALLOBJECTIVEOFACHIEVINGSUCCESSFULPROCESSINGBYECAECURRENTRESEARCHINTERESTISINTHEPROCESSINGTOOBTAINFINEGRAINEDBULKMAGNESIUMALLOYSPECIMENSFROMECAE14–20ASKETCHOFSUCHANECAEDIEISSHOWNINFIG1THEBOTTOMDIECONSISTSOFTWOINTERSECTINGCHANNELSOFTHESAMECROSSSECTIONMEETINGATANINNERCORNERANGLEUSEEFIG1INTHISFIGURE,THEANGLEWDEFINESTHEOUTERCURVATUREOFTHEINTERSECTIONBETWEENTHETWOCHANNELSINTHISCONTEXT,THEUSEOFTHEEXTREMEPRINCIPLES,FORINSTANCE,THEUPPERBOUNDMETHODHASGAINEDALOTOFATTENTIONTOESTIMATETHEPRESSURENEEDEDFORTHEPLUNGERASWELLASTHEACCUMULATEDEFFECTIVESTRAINRESULTINGFROMTHEECAEMETHODTHENUMERICALSIMULATIONWITHTHEHELPOFTHEFINITEELEMENTMETHODFEMHASBEENEXTENSIVELYUSEDTOBETTERUNDERSTATINGTHEECAEMETHOD21–25THEPLASTICDEFORMATIONBEHAVIORDURINGECAEISGOVERNEDMAINLYBYTHEDIEGEOMETRY,THEMATERIALITSELFANDTHEPROCESSINGCONDITIONSEXPERIMENTALDATAANDFINITEELEMENTSTUDYOFDIE’SGEOMETRYINFLUENCEONECAEPROCESSHIMSELFAREPRESENTEDITISNECESSARYTOTHEORETICALLYMODELTHEECAEPROCESSINORDERTOSTUDYVARIOUSCOMPLICATEDEFFECTSFORBETTERPROCESSCONTROLTHISSTUDYISTONUMERICALLYANALYZETHEDEFORMATIONBEHAVIORSINEQUALCHANNELANGULAREXTRUSIONSECAEOFMAGNESIUMALLOYAZ31ANDPREDICTTHESTRAINSANDEXTRUSIONFORCESOFECAETOFORMNANOSTRUCTUREPROCESSBASEDONVARIOUSDIESTRUCTURESFIG1SCHEMATICDIAGRAMOFANECAPDIESHOWINGINNERCORNERANGLEUANDOUTERCORNERANGLEWPLEASECITETHISARTICLEINPRESSASHUHJETALTHEDIESTRUCTUREDESIGN2009,DOI101016/JMATDES200901022INTHEPRESENTWORK,AQUASISTATICSOLUTIONTOTHEECAEMETHODBYTHEFEMSIMULATIONWASCARRIEDOUTUSINGDIESWITHINTERSECTINGANGLESU90C176AND120C176BYONLYONEPASSOFEXTRUSIONTHEFOURECAEMODELSHAVEBEENERECTEDINUGSOFTWAREANDMESHEDANDSIMULATEDINDEFORMTM3DCODENUMERICALSIMULATIONPROCEDURESANDMODELINGOFTHEDIESANDBILLET,BOUNDARYCONDITIONS,CONVERGENCEERRORLIMITSFORDEFORMATIONSIMULATIONSANDELEMENTFORMULATIONSHAVEBEENINTRODUCEDTHEEFFECTSOFDIFFERENTDIEGEOMETRIESONTHEDEFORMATIONINHOMOGENEITYDURINGECAPWEREINVESTIGATEDEXPERIMENTSFORTWOECAEDIESWITHORWITHOUTFILLETSHAVEBEENDONEINLABORATORYTOVALIDATETHESIMULATIONRESULTSBECAUSETHEEVOLUTIONOFTHEMICROSTRUCTURESANDMECHANICALPROPERTIESOFDEFORMEDMATERIALAREDIRECTLYRELATEDTOTHEAMOUNTOFPLASTICDEFORMATION,THEUNDERSTANDINGOFTHEPHENOMENONASSOCIATEDWITHTHESTRAINDEVELOPMENTISVERYIMPORTANTINECAEDISTRIBUTIONSOFEFFECTIVESTRESSANDSTRAIN,INFLUENCESOFCHANNELANGLEONTHEDEFORMATIONINDIFFERENTZONESANDDEFORMATIONHOMOGENEITY,MAXIMUMSTRAINHAVEBEENDISCUSSEDINDETAIL2MATERIALMODELSANDSIMULATIONDETAILSTHECOMMERCIALFEMCODE,DEFORM3DVERSION50,WASUSEDTOCARRYOUTTHESIMULATIONOFONEPASSECAEPROCESS21ASSUMPTIONSANDNUMERICALSIMULATIONPROCEDURESAWROUGHTMAGNESIUMALLOYAZ31WITH3ALUMINUM,1ZINCWASUSEDASTHEBILLETMATERIALBOTHINCOMPUTERSIMULATIONANDEXPERIMENTALVERIFICATIONTHENUMERICALSIMULATIONSWEREPERFORMEDQUASISTATICALLYUSINGACOMMERCIALFINITEELEMENTCODEDEFORMTM3DDEFORMTM3DWASACOMMERCIALPACKAGEDEVELOPEDBYSFTCSCIENTIFICFORMINGTECHNOLOGYCORPORATIONITWASAFINITEELEMENTMETHODFEMBASEDPROCESSSIMULATIONSYSTEMDESIGNEDTOANALYZE3DFLOWOFVARIOUSMETALFORMINGPROCESSESITPROVIDEDVITALINFORMATIONABOUTMATERIALANDTHERMALFLOWDURINGFORMINGPROCESSESTHEBILLETWASASSUMEDTOBEELASTIC–PLASTICMATERIALTHEFOLLOWINGASSUMPTIONSWASADOPTEDINPRESENTANALYSIS1BOTHTHECONTAINERANDTHEDIEARERIGIDBODIES;2THEEXTRUSIONBILLETWASARIGIDPLASTICMATERIAL;AND3THEFRICTIONFACTORSBETWEENTHEEXTRUSIONBILLETANDTHERAM,CONTAINER,ANDDIEWERECONSTANTTHESIMULATIONPROCEDURESWEREASFOLLOWS1THE3DGEOMETRIESBILLETS,RAMSANDDIESACHIEVEDBYCONSTRUCTING3DCADMODELSWEREDEFINEDINUNIGRAPHICSSOFTWAREGEOMETRIESCANBEDEFINEDAS3DIGESORSTLFILES2STOPPINGSTROKEWASSET,THERRADIUSOFTHEINNERCORNERMM_EEFFECTIVESTRAINRATESC01XXX2009XXX–XXXNUMBEROFSTEPSDEFINEDANDSIMULATIONMODEANDENGLISHORSIUNITSWERESELECTED3THEOBJECTSBILLETSANDDIESWEREMESHEDTHEOBJECTSWEREPOSITIONED,WITHTHEWORKPIECEASTHEREFERENCEOBJECT;BOTHTOOLSANDRAMINCONTACTWITHTHEWORKPIECETHEMATERIALSPROPERTIESWEREDEFINED4THERMALBOUNDARYCONDITIONSWEREDEFINED5OBJECTS’TEMPERATURESWEREINITIALIZED6CONTACTBOUNDARYCONDITIONSWEREGENERATEDANDFRICTIONCOEFFICIENTSBETWEENBILLETSANDDIES,BILLETSANDRAMSWEREDEFINED7RAMMOVEMENTPARAMETERSDIRECTIONANDSPEEDWEREASSIGNED8THEDATABASEWASCHECKEDANDGENERATEDANDCALCULATED,FEATOSIMULATETHEHOTEXTRUSIONPROCESSWASPERFORMED9THESIMULATIONRESULTSWEREREADFROMTHEPOSTPROCESSOROFEQUALCHANNELANGULAREXTRUSIONFORAZ31JMATERDESIGN22MODELINGOFTHEDIESANDRAMSTHEDIEGEOMETRIESUSEDINTHESIMULATIONSARESHOWNINFIG2THEBILLETCOORDINATEAXISXYZEMPLOYEDINTHEPRESENTSTUDYISSHOWNINFIG2THEX,YANDZDIRECTIONSWEREPARALLELTOEXTRUSIONDIRECTIONED,VERTICALDIRECTIONNDANDTRANSVERSEDIRECTIONTD,RESPECTIVELYTHECHANNELANGLESU90C176ANDU120C176ARECONSIDEREDANDILLUSTRATEDRESPECTIVELYINFIG2AANDBANDTHECORNERANG

注意事项

本文(外文翻译--基于三维有限元方法的AZ31镁合金等通道弯角挤压的模具结构设计 英文版.pdf)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网(发送邮件至[email protected]或直接QQ联系客服),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服客服 - 联系我们

网站客服QQ:2846424093    人人文库上传用户QQ群:460291265   

[email protected] 2016-2018  renrendoc.com 网站版权所有   南天在线技术支持

经营许可证编号:苏ICP备12009002号-5