BS EN 658-3-2002 Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Determination of flexural strength《高技术陶瓷 室温下陶瓷成份的机械特性 弯曲强度的测定》.pdf

1、BRITISH STANDARD BS EN 658-3:2002 Advanced technical ceramics Mechanical properties of ceramic composites at room temperature Part 3: Determination of flexural strength The European Standard EN 658-3:2002 has the status of a British Standard ICS 81.060.30 BS EN 658-3:2002 This British Standard, havi

2、ng been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 19 September 2002 BSI 19 September 2002 ISBN 0 580 40416 1 National foreword This British Standard is the offi

3、cial English language version of EN 658-3:2002. It supersedes DD ENV 658-3:1993 which is withdrawn. 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

4、 can be obtained on request to its secretary. Cross-references The British Standards which implement 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 “Searc

5、h” facility of the BSI Electronic Catalogue or of British Standards Online. This publication 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 obl

6、igations. aid enquirers to understand the text; present to the responsible international/European 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

7、 of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 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 NORMEEU

8、ROPENNE EUROPISCHENORM EN6583 August2002 ICS81.060.30 SupersedesENV6583:1992 Englishversion AdvancedtechnicalceramicsMechanicalpropertiesofceramic compositesatroomtemperaturePart3:Determinationof flexuralstrength CramiquestechniquesavancesPropritsmcaniques descramiquescompositestempratureambiante Dt

9、erminationdelarsistanceenflexion HochleistungskeramikMechanischeEigenschaftenvon keramischenVerbundwerkstoffenbeiRaumtemperatur Teil3:BestimmungderBiegefestigkeit ThisEuropeanStandardwasapprovedbyCENon6July2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditio

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

11、oninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxe

12、mbourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENn

13、ationalMembers. Ref.No.EN6583:2002EEN6583:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Principle4 4 Terms,definitionsandsymbols .4 5 Apparatus .5 5.1 Testmachine 5 5.2 Testjig .5 5.3 Datarecordingsystem . .5 5.4 Dimensionmeasuringdevices . 5 6 Testspecimens 5 7 Testspecimenp

14、reparation . 6 7.1 Machiningandpreparation. 6 7.2 Numberoftestspecimens 6 8 Testprocedures . 7 8.1 Displacementrate . .7 8.2 Measurementofdimensions . .7 8.3 Testingtechnique . .7 8.4 Testvalidity . .8 9 Calculationofresults 8 9.1 Testspecimenorigin .8 9.2 Flexuralstrength. .8 10 Testreport 9 Biblio

15、graphy 11EN6583:2002(E) 3 Foreword Thisdocument(EN6583:2002)hasbeenpreparedbyTechnicalCommitteeCEN/TC184“Advancedtechnical ceramics“,thesecretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyFebrua

16、ry2003,andconflictingnationalstandardsshallbewithdrawnatthelatest byFebruary2003. ThisdocumentsupersedesENV6583:1992. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Fi

17、nland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom. EN658hassixparts: Part1:Determinationoftensileproperties. Part2:Determinationofcompressiveproperties. Part3:Determinationofflexuralstrength. Part4:Determinati

18、onofinterlaminarshearstrengthbycompressionloadingofnotchedtestspecimens. Part5:Determinationofinterlaminarshearstrengthbyshortspanbendtest(threepoints). Part6:Determinationofinterlaminarshearstrengthbydoublepunchshearing.EN6583:2002(E) 4 1Scope ThispartofEN658describesamethodforthedeterminationofthe

19、flexuralstrengthofceramicmatrixcomposite materialswithcontinuousfibrereinforcement,underthreepointorfourpointbendatroomtemperature. Thismethodappliestoallceramicmatrixcompositeswithacontinuousfibrereinforcement,unidirectional(1D), bidirectional(2D),andtridirectionalxDwith(2x or=3)asdefinedinENV13233

20、,loadedalongoneprincipal axisofreinforcement. NOTE Themethodshouldnotbeusedtoobtainabsolutevaluesofstrengthfordesignpurposes. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthete

21、xt,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). ENISO75001, Meta

22、llicmaterialsVerificationofstaticuniaxialtestingmachinesPart1:Tension/compression testingmachines(ISO75001:1999). ENV13233, ISO3611, Micrometercallipersforexternalmeasurements . 3Principle Atestspecimenofspecifieddimensionsisflexionloadedtofractureinsuchawaythatfailureoccursintensionor compressional

23、ongoneprincipalaxisofreinforcement.Thetestisperformedatconstantcrossheaddisplacement rate. 4 Terms,definitionsandsymbols ForthepurposesofthisEuropeanStandard,thefollowingterms,definitionsandsymbolsandthosegivenin ENV13233apply. 4.1 maximumflexuralforce, F m highestrecordedforceinaflexuraltestonthete

24、stspecimenwhentestedtofailure 4.2 flexuralstress, s thenominalstressontheoutersurfaceofthetestspecimen,calculatedatmidspan NOTE Thisstressisconventionallycalculatedaccordingtothebeamtheory,whosebasicassumptionscannotbemetby ceramicmatrixcompositematerials. 4.3 flexuralstrength, s f,m maximumflexural

25、stressappliedtoatestspecimenthatfracturesduringaflexuraltestEN6583:2002(E) 5 5Apparatus 5.1 Testmachine Themachineshallbeequippedwithasystemformeasuringtheforceappliedtothetestspecimen.Thesystem shallconformtograde1accordingtoENISO75001. 5.2 Testjig Thetestjigiscomposedoftwoparts,linkedtothefixedand

26、mobilepartsofthemachine.Ithastwooutersupport rollersandone(threepointbend)ortwo(fourpointbend)innersupportrollers. Thecylindricalrollersshallhaveadiameterof4mmto10mm.Theirlengthshallbeatleastequaltothewidth ofthetestspecimen.Theyshallbemadeofamaterialwithahardnessatleastequaltothatofthetestspecimen.

27、 Theaxesoftherollersshallbeparalleltowithin0,01mm/mm. Theouterrollers(threeandfourpointbend)andinnerrollers(fourpointbend)shallbefreetorotate (seeFigure1). Eithertwoorthreerollers,forthreepointorfourpointbendrespectively,shallbefreetopivotaroundanaxis paralleltothelongitudinaldirectionofthetestspeci

28、men,inordertoadapttothenonparallelismoftheupperand lowerfacesofunmachinedtestspecimens(seeFigure1). Thedistancebetweenrollersshallbeinaccordancewithclause6. Theinnerrollersshallbecentredwithrespecttotheouterrollerstowithin0,2mm.Inthecaseoffourpointbend, thetestjigshallensuresymmetricalloadingofthete

29、stspecimen. 5.3 Datarecordingsystem Acalibratedrecordershallbeusedtorecordtheforcetimecurve.Theuseofadigitaldatarecordingsystem combinedwithananaloguerecorderisrecommended. 5.4 Dimensionmeasuringdevices Devicesusedformeasuringlineardimensionsofthetestspecimenshallbeaccurateto 0,1mm.Micrometers shall

30、beinaccordancewithISO3611. 6 Testspecimens RecommendedtestspecimendimensionsaregiveninTable1.Thesedimensionshavebeensuccessfullyused andtakeintoaccountthefollowingfactors: theamountofmaterialunderloadshallberepresentativeofthenatureofthematerialandofthereinforcement structure.Thissetsminimumlimitsto

31、thespanandtothewidthandthicknessofthetestspecimen.Inthecase offlexural,asopposedtotensiletesting,thedistributionofthelongitudinalreinforcementthroughthethickness hastobeconsidered.Whenthisdistributionisnotsymmetricalwithrespecttotheneutralplane,careshallbe takentoensurethatitissimilarbetweentestspec

32、imens. Twotypesoftestspecimenscanbedistinguished: asfabricatedtestspecimens,whereonlythelengthandthewidtharemachinedtogivetothetestspecimens thespecifiedsize.Inthiscasethetensileandcompressivesurfacesmaybeunmachinedandthusirregular; machinedtestspecimens,wherethelength,thewidthandthethicknessofthete

33、stspecimenhavebeen machined.EN6583:2002(E) 6 Toleranceonthicknessisonlyformachinedtestspecimens.Forasfabricatedtestspecimens,themaximum differenceinthicknessofthreemeasurements(atthecentreandateachendoftheouterspanlength)shallnot exceed5%oftheaverageofthethreemeasurements. Thethicknessofthetestspeci

34、menandthedistancebetweentheinnerandouterroller(s)shallbechosensoasto avoidshearfailure.Thisisachievedbysettingaminimumlimittotheratiobetweenthemomentarmandthetest specimenthickness(seeTable1).Avalueof10iscommonlyusedandtranslatesintoaminimum L/hratioof20in threepointbend,andaminimum( L L i )/hratioo

35、f20infourpointbendwith L i = L/3. Table1Recommendedtestspecimenandspandimensions Dimensionsinmillimetres 1D,2D,xD Tolerance l t ,totallength L+10 +1 b,width 10 +0,2 h,thickness 2,5 +0,2 Innerspan L i ,fourpointbend 25 +0,1 Outerspan L,fourpointbend 75 +0,1 L,threepointbend 50 +0,1 NOTE Ifitisnecessa

36、rytodefinetestspecimensofdifferentdimensions,theconditionsofclause6shouldbetakeninto account. 7 Testspecimenpreparation 7.1 Machiningandpreparation Duringcuttingout,careshallbetakentoalignthelongitudinaltestspecimenaxiswithoneoftheprincipalaxesof reinforcement. Testspecimensmaybetestedwitheithermach

37、inedornonmachinedtensileandcompressivesurfaces.Insome casesmachiningisnotrecommendedbecauseitmaycausedamagetothematerialnearthetensileand compressivesurfaces.Whenmachiningthesesurfaces,careshallbetakentomaintainareinforcementgeometry acrossthethicknessofthetestspecimen,whichisrepresentativeofthemate

38、rialintheasprocessedcondition.In particular,itshallbeassuredthatthesymmetryofanoriginallysymmetricreinforcementgeometryispreservedin thetestspecimencrosssectionaftermachining. Machiningparameterswhichavoiddamagetothematerialshallbeestablishedanddocumented.These parametersshallbeadheredtoduringtestsp

39、ecimenpreparation. 7.2 Numberoftestspecimens Atleastfivevalidtestresults(8.4)arerequired. Fortestspecimenswithanonsymmetricreinforcementgeometrywithrespecttotheneutralplane,testsin twoorientationsforwhichthetensileandcompressivefaceareinterchangedmaybenecessary. NOTE Ifstatisticalevaluationisrequire

40、d,thenumberoftestspecimensshouldbeinaccordancewithENV8435 .EN6583:2002(E) 7 8 Testprocedures 8.1Displacement rate Useacrossheaddisplacementratewhichallowstestspecimenfailurewithin1min.Thedisplacementrateshallbe reported. 8.2 Measurementofdimensions 8.2.1 Testspecimendimensions Thewidthandthicknesssh

41、allbemeasuredtothenearest0,01mminthreepointsnearthecentreforthreepoint bendandbetweentheinnerrollersforfourpointbend,andateachendofthetestspecimen. Thearithmeticmeansofthemeasurementsshallbeusedforcalculations. 8.2.2 Distancesbetweensupportingrollers Thedistancebetweenaxesoftheouterrollersandforfour

42、pointbendalsotheinnerrollers,shallbemeasuredto thenearest0,1mm. NOTE Thiscanbeachievedbytheuseofatravellingmicroscopeorothersuitabledeviceaccurateto0,05mm. 8.3 Testingtechnique 8.3.1 Testspecimenmounting Thetestspecimenshallbeinstalledinthetestjigcentredwithrespecttotherollersandwithitslongitudinala

43、xis perpendiculartotheaxesoftherollers. NOTE Itisrecommendedtouseasettingtoolforthispurpose. Zerotheloadcelloutput.Whenrequired,asmallpreloadcanbeappliedinordertomaintaincorrectpositioning ofthetestspecimen.Thispreloadshallnotincreasebeyond5%oftheexpectedfailureforceatanytime. 8.3.2Measurements setthedisplacementrateonthetestmachine; zerotheloadcell; recordtheforceversustime; loadthetestspec