ImageVerifierCode 换一换
格式:PDF , 页数:14 ,大小:181KB ,
资源ID:552336      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-552336.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(BS EN 820-1-2003 Advanced technical ceramics - Methods of testing monolithic ceramics - Thermo-mechanical properties - Determination of flexural strength at elevated temperatures《高.pdf)为本站会员(appealoxygen216)主动上传,麦多课文库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,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

BS EN 820-1-2003 Advanced technical ceramics - Methods of testing monolithic ceramics - Thermo-mechanical properties - Determination of flexural strength at elevated temperatures《高.pdf

1、BRITISH STANDARD BS EN 820-1:2002 Advanced technical ceramics Methods of testing monolithic ceramics Thermomechanical properties Part 1: Determination of flexural strength at elevated temperatures The European Standard EN 820-1:2002 has the status of a British Standard ICS 81.060.30 BS EN 820-1:2002

2、 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 6 March 2003 BSI 6 March 2003 ISBN 0 580 41375 6 National foreword This British Standard is the official English language version of EN 820-1:2002. It supersedes DD ENV 820-1:1994 which is with

3、drawn. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which im

4、plement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication

5、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Euro

6、pean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pa

7、ges 2 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN8201 October2002 ICS81.060.30 SupersedesENV820

8、1:1993 Englishversion AdvancedtechnicalceramicsMethodsoftestingmonolithic ceramicsThermomechanicalpropertiesPart1:Determination offlexuralstrengthatelevatedtemperatures CramiquestechniquesavancesMthodedessaides cramiquesmonolithiquesPropritsthermodynamiques Dterminationdelarsistancelaflexiontempratu

9、res leves HochleistungskeramikMonolithischeKeramik ThermomechanischeEigenschaftenTeil1:Bestimmung derBiegefestigkeitbeierhhtenTemperaturen ThisEuropeanStandardwasapprovedbyCENon8August2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope

10、an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagema

11、debytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlan

12、ds,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No

13、.EN8201:2002EEN8201:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Apparatus .5 4.1 General5 4.2 Testjig .5 4.3 Heatingdevice 6 4.4 Testmachine 6 4.5 Linearmeasuringdevices .6 4.6 Dryingoven . .7 5 Testpieces. .7 6 Testtemperaturesandnumberoftests . .

14、7 7 Testprocedure .7 8 Calculations8 9 Accuracyandreferences . .9 10 Testreport 10EN8201:2002(E) 3 Foreword ThisdocumentEN8201:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC184“Advancedtechnical ceramics“,thesecretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,e

15、itherbypublicationofanidenticaltextor byendorsement,atthelatestbyApril2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby April2003. ThisdocumentsupersedesENV8201:1993. ThisdocumenthasbeenpreparedunderamandategiventoCENbytheEuropeanCommissionandtheEuropean FreeTradeAssociation. EN820 A

16、dvancedtechnicalceramicsMethodsoftestingmonolithicceramicsThermomechanicalproperties consistsofthreeParts: Part1:Determinationofflexuralstrengthatelevatedtemperatures Part2:Determinationofselfloadeddeformation Part3:Determinationresistancetothermalshockbywaterquenching AccordingtotheCEN/CENELECInter

17、nalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN8201:

18、2002(E) 4 1Scope ThisPartofthisEuropeanStandardspecifiesamethodofdeterminingthethreepointorfourpointflexuralstrengthof advancedmonolithictechnicalceramicsatelevatedtemperaturesasagreedbetweenpartiestothetest.Thetestcan beperformedinanyappropriateatmosphere. 2 Normativereferences ThisEuropeanStandard

19、incorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andinthepublicationslistedhereafter.Fordated references,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropeanStandardonly whenincorporatedinit

20、byamendmentorrevision.Forundatedreferencesthelatesteditionofthepublicationreferred toapplies(includingamendments). EN8431, AdvancedtechnicalceramicsMonolithicceramicsMechanicaltestsatroomtemperaturePart1: Determinationofflexuralstrength. ENV8435, AdvancedtechnicalceramicsMonolithicceramicsMechanical

21、testsatroomtemperaturePart5: Statisticalanalysisoffracturedata. EN100022, MetallicmaterialsTensiletestingPart2:Verificationoftheforcemeasuringsystemofthetensile testingmachine. ENISO17025, Generalrequirementsforthecompetenceoftestingandcalibrationlaboratories. IEC60584, ThermocouplesPart1:Referencet

22、ables. IEC60584, ThermocouplesPart2:Tolerances. ISO3611, Micrometercallipersforexternalmeasurement. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 nominalflexuralstrength maximumnominalstressattheinstantoffailuresupportedbythematerialwhenloadedin

23、elasticbending NOTE Itisrecognisedthatflexuralstrengthtestsonceramicsatelevatedtemperaturemayrevealinelasticbehaviourin thematerial.Undersuchconditions,thenominalflexuralstrengthcalculatedinaccordancewiththisstandardisnotstrictly a validresult,sinceittendstooverestimatethetruesurfacestressinthetestp

24、iece.Thismethodrequiresthatthe load/displacementrelationshipforeachtestpieceateachtemperatureisinspected,andthevalidityoftheresultdetermined. 3.2 threepointflexure meansofbendingabeamtestpiecewherebythetestpieceissupportedonbearingsnearitsends,andacentralload isappliedEN8201:2002(E) 5 3.3 fourpointf

25、lexure meansofbendingabeamtestpiecewherebythetestpieceissupportedonbearingsnearitsends,andisloaded equallyattwopointssymmetricallydisposedaboutthecentreofthesupportedspan 3.4 inelasticdeformation forthepurposesofthetest,thedeformationofatestspecimenunderloadwhichisnotentirelyelasticandreversibleon r

26、emovaloftheload 3.5 subcriticalcrackgrowth extensionofexistingcracksorflawsunderastresswhichdoesnotproduceinstantfailure NOTE Thiseffectcanbeduetotheintrinsiccrackpropagationofthematerial,additionallyinfluencedbytheenvironment. 4Apparatus 4.1General Thetestiscarriedoutinasimilarmannertothatprescribe

27、dinEN8431fortestingatroomtemperature,withthe exceptionsthatthetestjigshallbeconstructedfrommaterialswhicharecapableofremaininglinearlyelasticatthe temperatureoftesting,andthatameansofheatingthetestjigandtestpiecetothetesttemperatureisrequired. 4.2 Testjig Thetestjigshallbeofadesignthatallowsfullarti

28、culationforalignmentofthesupportandloadingrollersonthe surfacesofthetestpiece,andinwhichtherollersarecapableofrollingtominimisefrictionbetweentherollersandthe testpiece. NOTE1 Itisrecognisedthatpracticallimitationscanrestrictthedesignofthetestjig,andoxidationeffectscanrestrict its function.Insuchcas

29、es,alternativesmaybeemployed,butdeviationsfromthefunctionspecifiedaboveshouldbereportedin thereport(seeclause10,d). Theouterspanofthetestjigshallbeeither20,0mm0,5mm(spanA)or40,0mm0,5mm(spanB).Forthreepoint flexuretheloadingrollershallbecentralisedrelativetothespantowithin0,2mm.Forfourpointflexure,th

30、einnerspan shallbe10,00,2mm(spanA)or20,0mm0,2mm(spanB).Theinnerrollersshallbesymmetricallypositioned relativetotheouterrollerstobetterthan0,2mm. NOTE2 Thisrepresentsarelaxationofcentralisationrequirementscomparedwithroomtemperaturetesting(requirement 0,1mm,seeEN8431)becauseitcanbecomerelativelymored

31、ifficulttosetuptestjigsinsidefurnaces. Measurementsofthepositionsoftherollersshallbemadewithatravellingmicroscope(4.5.2). Therollersshallbemadefromamaterialwhichiscapableofremaininglinearlyelasticuptothemaximumtemperature oftheseriesoftests.Forteststo400C,hardenedsteelrollersasinEN8431shallsuffice.F

32、orhighertemperaturesit isrecommendedthatthetestjigisconstructedfromfinegrainedstrongrefractoryceramicmaterials. NOTE3 Fortemperaturesupto1400C,highpurityhighaluminaceramicmaterialscanbeused.Fortemperaturesupto1 500Cinairorupto1700 Cinneutralatmospheres,sinteredsiliconcarbideisrecommended. Considerat

33、ionshouldbegiventoanypotentialreactionbetweenthetestmaterialandtherollersatthemaximumtest temperature,andthechoiceofrollermaterialshallbemadesuchthatreactionsareminimised.Inparticular,nonoxide ceramicmaterialsmaytendtooxidise,andtheoxidethenmayreactwiththeloadingrollers.Rollersshallbe maintainedwith

34、acleansmoothburrfreesurfaceforalltests.Theyshallbeinspectedbeforeanytesttoensurethey areundamaged,andarecapableofrollingfreelyinthejigatthestartofthetest.Ifnecessary,rollersshouldbe replacedtomaintaincorrectjigfunction.Similarly,reactionsbetweenthemainceramiccomponentsofthetestjigshall beminimizedby

35、appropriatechoiceofmaterial.EN8201:2002(E) 6 NOTE4 Atveryhightemperatures,theprogressiveoxidationofnonoxidejigcomponentscanleadtothedevelopmentof frictionaleffectsduetoinabilityoftherollerstorollfreely.Sucheffectscanleadtouncertaintiesinnominalflexurals trengthof upto5%.Itisnotpossibletoquantifythis

36、effect,whichislikelytobetime,temperatureandmaterialdependent.Jigcompo nents canbefoundtohaveweldedtogetheroncoolingtoroomtemperature.Theyshouldbegentlyseparatedandcleanedbeforere use. Theloadshallbeappliedtothetestjigthroughsolidorhollowcolumnswhichareloadedbythetestmachine.These columnsshallbeofama

37、terialwhichremainslinearlyelastictothemaximumtestingtemperature. NOTE5 Toascertainthis,thecolumnsofthetestjigcanbebroughtintocontactattheappropriatetesttemperaturewithor withoutthejiginplace.Aloadequivalenttothatestimatedtobeneededtofracturetestpiecesisapplied,andtheapparent load displacementrelatio

38、nshipisexaminedforevidenceofnonlinearitywithincreasingload(seeclause8). 4.3 Heatingdevice Thetestjigshallbecontainedwithinafurnaceorsuitableheatingdeviceofdesignappropriatetothemaximum temperatureforthetests,andcapableofreachingthemaximumtestingtemperaturewithin3h. NOTE1 Theuseofveryfastheatingrates

39、isnotrecommendedbecauseofriskoffractureofceramiccomponentsinthetest jigorcolumns. Thetemperaturecontrolsystemusedwiththefurnaceshallbecapableofcontrollingtowithin5Cusingasuitable thermocouple.Thetemperatureofthetestpieceshallberecordedusingasecondthermocouplemanufacturedin accordancewiththemanufactu

40、ringtolerancesstatedinIEC605842,allowingtheuseofreferencetablesinIEC 605841or,alternatively,calibratedinamannertraceabletotheInternationaltemperaturescaleITS90.Thetipofthe thermocoupleshallbeclosetobutnottouchingthetestpiece.Itshallpreviouslyhavebeendeterminedthatthe temperatureofthetestpieceshallno

41、tvarybymorethan5Coveritslengthaftera15minuteholdtimeatthe requiredtestingtemperature. NOTE2 Foruseinanairatmosphere,thefurnacecanmostconvenientlybeofasplitdesignallowingaccesstothetestjig inthepositionfortesting.Foracontrolledatmosphere,asimilararrangementmaybeusedwiththetestjigsurroundedbya gastigh

42、tworktube,oralternatively,asealedatmospherefurnacemaybeemployed.Theflowconditionsforgasshouldalsobe considered.Itshouldpreferablybestaticoroflimitedflowratetominimiseproblemsofinhomogeneoustestpiecetemperature . Inallcasesitisdesirabletohavereadyaccesstothetestjigduringsetup.Amultipletestjigorhotspe

43、cimeninsertion system canhavesomeadvantagesintermsoftotaltimerequiredfortesting,butcareshouldbetakenthatthejigandtestpiece alignmentrequirementsaremaintainedforalljigsand/ortestpieces,andthe15mintemperatureequilibrationtimeisusedfo r eachtestpiece. NOTE3 Itisadvisabletoemploywatercoolingforpartsofthefurnaceandloadingcolumnsystemtominimisethe temperaturevariationsofth

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1