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--在RTM瓶坯渗透和磨具填充过程中织物组织和磨具曲率的影响 英文版.pdf

  • 资源大小:1.01MB        全文页数:9页
  • 资源格式: PDF        下载权限:游客/注册会员/VIP会员    下载费用:10
游客快捷下载 游客一键下载
会员登录下载
下载资源需要10

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--在RTM瓶坯渗透和磨具填充过程中织物组织和磨具曲率的影响 英文版.pdf

FABRICSTRUCTUREANDMOLDCURVATUREEFFECTSONPREFORMPERMEABILITYANDMOLDFILLINGINTHERTMPROCESSPARTIEXPERIMENTSSBICKERTON,EMSOZER,PJGRAHAM,SGADVANIDEPARTMENTOFMECHANICALENGINEERING,UNIVERSITYOFDELAWARE,NEWARK,DE19716,USARECEIVED15OCTOBER1998;RECEIVEDINREVISEDFORM31AUGUST1999;ACCEPTED23SEPTEMBER1999ABSTRACTLIQUIDCOMPOSITEMOLDINGLCMPROCESSESREQUIRETHEIMPREGNATIONOFAPOLYMERICRESINTHROUGHAPOROUSPREFORM,BEINGCOMPOSEDOFGLASS,CARBON,ORKEVLARFIBERSTHESUCCESSFULMANUFACTUREOFCOMPOSITEPARTSTHROUGHTHESEMETHODSISDEPENDENTONTHESUCCESSFULFILLINGOFTHEMOLDCAVITY,EXPELLINGALLAIRFROMWITHINNUMERICALSIMULATIONSAREBEINGDEVELOPEDTOMODELTHISPROCESS,ANDAREPOWERFULMOLDDESIGNTOOLSTHEACCURACYOFSUCHSIMULATIONSISSTRONGLYDEPENDENTONTHESPECIFICATIONOFTHEPREFORMPERMEABILITYTENSORTHROUGHOUTTHEMOLDCAVITY,BEINGANUMERICALDESCRIPTIONOFTHERESISTANCETORESINFLOWCHANGESINPREFORMARCHITECTURECANEASILYMODIFYLOCALPERMEABILITY,ANDHENCETHEMOLDFILLINGCORNERSINMOLDCAVITIESAREAPOTENTIALSITESFORPREFORMDEFORMATION,ANDARETHEFOCUSOFTHISSTUDYAFAMILYOFFIVEMOLDSHAVEBEENSTUDIED,CONTAININGCORNERRADIIFROM006TO80INADETAILEDFLOWVISUALIZATIONSTUDYHASBEENCOMPLETEDTOINVESTIGATETHEINFLUENCEOFMOLDCORNERRADIIONFLOWFRONTPROGRESSIONANDINJECTIONPRESSUREWHILEFLOWFRONTPROGRESSIONWASNOTSIGNIFICANTLYAFFECTEDBYDIFFERENTCORNERRADII,INJECTIONPRESSURESWEREFOUNDTOBEGREATERFORTHEMOLDSWITHSMALLERCORNERRADIIACTUALCOMPOSITEPARTSMANUFACTUREDINTHESAMEMOLDSHAVEREVEALEDTHATTHEMOLDSARENOTOFCONSTANTCAVITYTHICKNESS,ASWASTHEORIGINALGOALTODETERMINETHEIMPORTANCEOFCORNERRADIIONMOLDFILLING,ITWILLBENECESSARYTOSEPARATETHEEFFECTSOFINPLANEPREFORMCOMPRESSIONFROMANYEFFECTDUETOCORNERSTOACCOMPLISHTHISGOAL,THEEXPERIMENTALDATAPRESENTEDHEREISBEINGCOMPAREDWITHDETAILEDNUMERICALSTUDIES,WHICHWILLBEPRESENTEDINPARTIIOFTHISWORKKEYWORDSLIQUIDCOMPOSITEMOLDING;ERESINTRANSFERMOLDING1INTRODUCTIONLIQUIDCOMPOSITEMOLDINGLCMPROCESSESAREPOPULARCOMPOSITEMATERIALMANUFACTURINGTECHNIQUESGAININGFAVORINTHECIVIL,AEROSPACE,AUTOMOTIVEANDDEFENSEINDUSTRIESTHESEPROCESSESPOSSESSSEVERALADVANTAGES,INCLUDINGNETSHAPEPRODUCTION,RELATIVELYLOWINJECTIONPRESSURES,MODERATELYLOWCYCLETIMES,ANDSIMPLETOOLINGREQUIREMENTSLCMPROCESSESHAVETHEPOTENTIALTOPRODUCELOWCOST,HIGHQUALITY,GEOMETRICALLYCOMPLEXCOMPOSITEPARTSRESINTRANSFERMOLDINGRTM,STRUCTURALREACTIONINJECTIONMOLDINGSRIM,SEEMANCOMPOSITERESININFUSIONMOLDINGPROCESSSCRIMP,ANDINJECTION–COMPRESSIONMOLDINGAREEXAMPLESOFTHEMANYLCMPROCESSVARIATIONSGENERALLY,LCMPROCESSESCANBEDESCRIBEDASFOLLOWSFIRST,THEFIBERPREFORMISMANUFACTURED,BEINGTHEREINFORCEMENTOFTHEINTENDEDPARTONEOFTHEMAJORADVANTAGESOFLCMPROCESSESISTHEABILITYTOTAILORTHEPREFORMEXACTLYTOTHENEEDSOFTHEPART,PLACINGREINFORCEMENTASREQUIREDFIBERPREFORMSARECONSTRUCTEDFROMAWIDEVARIETYOFARCHITECTURES,CONSTRUCTEDFROMGLASS,CARBONORKEVLARFIBERSTHEFIBERPREFORMWILLPROVIDETHEFINISHEDPIECEWITHTHEMAJORITYOFITSSTRUCTURALPROPERTIESTHEPREFORMISPLACEDWITHINTHEMOLDCAVITY,ANDTHEMOLDISSEALEDNEXT,THEPOLYMERICRESINISINJECTEDINTOTHEMOLDCAVITY,SATURATINGTHEPREFORMANDEXPELLINGANYAIRPRESENTACURINGREACTIONISINITIATED,EITHERAFTERCOMPLETELYFILLINGTHEMOLDCAVITY,ORPOSSIBLYATSOMESTAGEDURINGIMPREGNATIONAFTERTHEPIECEISSUFFICIENTLYCURED,THEFINISHEDCOMPOSITEPRODUCTCANBEREMOVEDFROMTHEMOLD1THESUCCESSFULMANUFACTUREOFLCMPARTSISSENSITIVETOTHEPREFORMING,IMPREGNATION,ANDCURINGSTAGESTHISPAPERWILLFOCUSONTHEDEFORMATIONOFPREFORMSAROUNDCORNERSWITHINMOLDS,STUDYINGITSINFLUENCEONTHESUBSEQUENTIMPREGNATIONSTAGEDEFECTSINCURREDTHROUGHUNSUCCESSFULMOLDFILLINGINCLUDEBOTHMICROSCOPICANDMACROSCOPICVOIDS2,3MICROSCOPICVOIDSREFERTOTINYAIRBUBBLESTRAPPEDWITHIN,ANDAROUNDFIBERBUNDLESOFTHEPREFORMSUCHVOIDSAREOFTENVERYDIFFICULTTOERADICATECOMPLETELY,BUTATTEMPTSSHOULDBEMADETOMINIMIZETHEM4MACROSCOPICVOIDSREFERTOLARGEAIRPOCKETSTHATHAVEBEENTRAPPEDWITHINTHEMOLDCAVITYDUETOAFAULTYINJECTIONSCHEMECOMPOSITESPARTA312000423–438CORRESPONDINGAUTHOREGINCORRECTLYPLACEDINJECTIONPORTSANDVENTSUSUALLYSUCHVOIDSWILLRESULTINAPARTTHATISUNUSABLE,ASPORTIONSOFTHEPARTWILLBEFORMEDBYDRYPREFORMHAVINGNOSTRUCTURALRIGIDITYTHEAIMOFTHISWORKWASTOINVESTIGATEWHETHERCORNERSOFDIFFERENTRADIIWOULDHAVEANYSIGNIFICANTEFFECTONTHEPROGRESSOFTHERESINFLOWFRONTWITHINAMOLDCAVITY,ANDPOSSIBLYCAUSETHEFORMATIONOFMACROSCOPICVOIDSLCMFILLINGPROCESSESARETYPICALLYMODELEDNUMERICALLYUSINGDARCY’SLAW,WHICHRELATESPRESSUREGRADIENTSWITHINAMOLDTOANUMERICALMEASUREOFTHERESISTANCETOFLOWTHROUGHTHEPREFORM,BEINGTHEPERMEABILITYINRECENTTIMES,MUCHEFFORTHASBEENPLACEDINTOTHEDEVELOPMENTOFDARCY’SLAWBASEDNUMERICALPROCESSSIMULATIONSOFLCMFILLINGPROCESSES5–11SUCHSIMULATIONSCANPREDICTTHEFLOWPATTERNSANDPRESSUREDISTRIBUTIONASLONGASWEHAVEPRIORKNOWLEDGEOFTHEMATERIALPARAMETERS,BEINGPRIMARILYTHECOMPONENTSOFTHEPERMEABILITYTENSORMANYPAPERSHAVEBEENPUBLISHEDCONCERNINGPERMEABILITYSBICKERTONETAL/COMPOSITESPARTA312000423–438424ABFIG1MOLDAAALUMINUMBASE;BALUMINUMBASEANDACRYLICTOPMEASUREMENTS,ANDANALYTICALPERMEABILITYPREDICTIONS12–15THOUGHMUCHPROGRESSHASBEENMADEINBOTHFIELDS,THEWIDEVARIETYOFPREFORMSTYLES,ANDTHEIRVARIATIONINARCHITECTUREWITHCOMPACTION,HAVEINHIBITEDTHEFORMATIONOFACOMPREHENSIVEPERMEABILITYDATABASEPREFORMPERMEABILITIESCANALSOBEFURTHERALTEREDBYSEVERALSECONDARYEFFECTS,INCLUDINGRACETRACKING16,17,MULTILAYEREDPREFORMS18,PREFORMCOMPACTION19,ANDPREFORMSHEARING17,20,AMONGOTHERSTHISWORKHASAIMEDTODETERMINETHEMAGNITUDEOFEFFECTONLCMMOLDFILLINGPROCESSESDUETOMOLDCORNERSOFVARIOUSRADIIIFANYEFFECTSDUETOMOLDCORNERSARESIGNIFICANT,MODELSNEEDTOBEDEVELOPEDTOACCOUNTFORANYVARIATIONINPERMEABILITYINTHESEREGIONSIFTHEEFFECTSARESHOWNTOBENEGLIGIBLE,PERMEABILITYTENSORSDETERMINEDFORFLATPORTIONSOFAMOLDWITHTHESAMEFIBERVOLUMEFRACTIONCANBEAPPLIEDTOTHESECORNERREGIONSPRELIMINARYSTUDIESINTOTHEFLOWAROUNDCORNERSHASBEENPRESENTEDBYFRIEDMANETAL21VERYDETAILEDEXPERIMENTSANDCALCULATIONSHAVEBEENPREFORMED,HOWEVER,THEEVIDENCEPRESENTEDDOESNOTCLEARLYDEMONSTRATETHEMAGNITUDEOFANYEFFECTSDUETOMOLDCORNERSTHEEXPERIMENTALPORTIONOFTHISSTUDYHASBEENCOMPLETEDINTWOPARTSDETAILEDFLOWVISUALIZATIONEXPERIMENTSHAVEBEENCOMPLETEDTODETERMINETHENATUREANDMAGNITUDEOFEFFECTCORNERSOFVARIOUSRADIIHAVEONTHEMOLDFILLINGPROCESSFIVEMOLDSWEREUSED,HAVINGMOLDRADIIVARYINGFROM006TO80INTHEFEMALEHALVESOFTHEMOLDSWEREMACHINEDFROMACRYLIC,ALLOWINGFORTHEMOLDFILLINGTOBEVISUALIZEDTHREEDIFFERENTPREFORMSTYLESWEREINVESTIGATED,ATAVARIETYOFFIBERVOLUMEFRACTIONSINJECTIONPRESSUREHISTORIESANDFLOWFRONTPROGRESSIONHAVEBEENRECORDEDTHESECONDPORTIONOFTHEEXPERIMENTALPROGRAMHASFOCUSEDONTHEMANUFACTUREOFACTUALCOMPOSITEPIECESINTHESAMEMOLDSSOMESMALLMODIFICATIONSWEREMADETOTHEMOLDS,INORDERTOPROTECTTHEACRYLICMOLDHALVESFROMTHERESINUSEDPARTSWEREMANUFACTUREDUSINGTHESAMEPREFORMSUSEDINTHEFLOWVISUALIZATIONSTUDYTHESEPARTSHAVESERVEDTWOPURPOSES,VERIFYINGTHEGEOMETRYOFTHEMOLDCAVITIES,ANDPROVIDINGSOMEINSIGHTINTOTHESTATEOFPREFORMDEFORMATIONNEARCORNERSTHEFINDINGSOFOUREXPERIMENTALSTUDIESAREPRESENTEDINSBICKERTONETAL/COMPOSITESPARTA312000423–438425VENTSPORTINJECTIONSTIFFENINGBARSFIG2OVERHEADVIEWOFASSEMBLEDMOLD,WITHSTIFFENINGBARSFIG3SCHEMATICDEFININGMOLDGEOMETRICALDATAAMOLDSA–D;BMOLDETABLE1MOLDGEOMETRICALDATAR1M/INR2M/INT1M/INT2M/INMOLDA152410230060469910230185304810230120223510230088MOLDB254010230100571510230225299710230118215910230085MOLDC635010230250952510230375302310230119215910230085MOLDD127010230500158810230625299710230118302310230119MOLDE203210238000206410238125307310230121–THISPAPERDUETOTHEACTUALMOLDCAVITYGEOMETRIES,TWOTYPESOFPREFORMDEFORMATIONHAVEBEENINTRODUCEDASTWOOFTHEMOLDCAVITIESHAVEPORTIONSWITHSIGNIFICANTLYDIFFERENTTHICKNESSES,EFFECTSDUETOPREFORMCOMPRESSIONHAVEBEENIDENTIFIED,ANDARECOUPLEDWITHTHOSETHATMAYBEPRESENTDUETOCORNERRADIIAFOLLOWUPPAPERWILLPRESENTADETAILEDNUMERICALSTUDYTHATWILLSERVETOIDENTIFYTHEINFLUENCEOFBOTHDEFORMATIONSTYLESTHISISNEEDEDTOASSESSTHEIMPORTANCEOFMOLDCORNERRADIIONLCMFILLINGPROCESSES2EXPERIMENTALPROGRAMDETAILEDFLOWVISUALIZATIONEXPERIMENTSHAVEBEENPERFORMED,PROVIDINGEXTENSIVEVALIDIFICATIONDATAFORTHENUMERICALSIMULATIONSWHICHAREPRESENTEDINOURSECONDPAPEREXPERIMENTALLYMEASUREDINJECTIONPRESSUREHISTORIESWILLBEPRESENTEDFORTHREEPREFORMSTYLES,ANDATVARIOUSVOLUMEFRACTIONSVIDEOSNAPSHOTSAREPROVIDEDFROMSELECTEDEXPERIMENTSTHEMOLDS,BEINGDESIGNEDFORFLOWVISUALIZATION,HAVEBEENMODIFIEDTOALLOWTHEMANUFACTUREOFACTUALCOMPOSITEPARTS,USINGTHESAMEPREFORMS,ANDAVINYLESTERRESINTHESEPARTSHAVEBEENANALYZEDTOPROVIDEDETAILEDINFORMATIONABOUTTHEMOLDSUSED,THEIRARCHITECTUREANDVOLUMEFRACTION,WHICHSHEDSLIGHTONHOWFABRICSCOMPACTAROUNDCURVATURES21MOLDDETAILSAFAMILYOFFIVERTMFLOWVISUALIZATIONMOLDSWEREMADEAVAILABLEFORTHISSTUDYBYTHEUSARMYRESEARCHOFFICETHESEMOLDSWEREINITIALLYDESIGNEDWITHTHEINTENTTOSTUDYTHEEFFECTOFCORNERSONTHEMOLDFILLINGPROCESS,THECORNERRADIIBEINGDIFFERENTINEACHMOLDBYMANUFACTURINGCOMPOSITEPARTSWITHINTHESEMOLDSDETAILEDMOLDCAVITYDIMENSIONSWEREOBTAINEDITWASFOUNDTHATTHREEOUTOFTHEFIVEMOLDSDIDNOTHAVECONSTANTCAVITYTHICKNESSES,ANDWERESIGNIFICANTLYDIFFERENTFROMTHEHORIZONTALTOTHEINCLINEDFLATSECTIONSOFTHEMOLDBOTHRADIUSANDTHICKNESSDATAISPRESENTEDINTHISSECTIONMOLDCAVITYTHICKNESSVARIESFROMONESECTIONTOANOTHERINAMOLD,ANDALSOFROMONEMOLDTOANOTHERHENCETHISREQUIRESTHESBICKERTONETAL/COMPOSITESPARTA312000423–438426FIG4EXPERIMENTALSCHEMATICFORFLOWVISUALIZATIONFIG5SCHEMATICOFMOLDCONFIGURATIONFORCOMPOSITEPARTMANUFACTURE

注意事项

本文(外文翻译--在RTM瓶坯渗透和磨具填充过程中织物组织和磨具曲率的影响 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