1、BRITISH STANDARD BS EN 12814-7:2002 Testing of welded joints of thermoplastics semi-finished products Part 7: Tensile test with waisted test specimens The European Standard EN 12814-7:2002 has the status of a British Standard ICS 25.160.40 BS EN 12814-7:2002 This British Standard, having been prepar
2、ed 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 21 October 2002 BSI 21 October 2002 ISBN 0 580 40629 6 National foreword This British Standard is the official English langu
3、age version of EN 12814-7:2002. The UK participation in its preparation was entrusted to Technical Committee PRI/80, Welding of plastics, 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 S
4、tandards 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 “Search” facility of the BSI Electronic Catalogue or of British Standards Online.
5、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 obligations. aid enquirers to understand the text; present to the responsible i
6、nternational/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 of pages This document comprises a front cover, an inside front cover, the
7、EN title page, pages 2 to 9 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 EN128147 October2002 ICS25.160.40 Englishversion Testi
8、ngofweldedjointsofthermoplasticssemifinishedproducts Part7:Tensiletestwithwaistedtestspecimens Essaisdesassemblagessoudssurproduitssemifinisen thermoplastiquesPartie7:Essaidetractionavec prouvettesentaillesenU PrfenvonSchweiverbindungenausthermoplastischen KunststoffenTeil7:ZugversuchanProbekrpernmi
9、t Rundkerbe ThisEuropeanStandardwasapprovedbyCENon19August2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational s
10、tandardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe off
11、icial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION E
12、UROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN128147:2002EEN128147:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Symbolsanddesignations .4 4 Prin
13、cipleofthetest. .4 5 Samplingprocedures . .5 6 Dimensionsoftestspecimens .5 7 Cuttingoftestspecimens. 6 8 Mechanicaltesting .6 9 Testequipment 6 10 Determinationofthetensileenergyweldingfactor . 6 11 Testreport 7 AnnexA (informative) Testspeedsforsomethermoplasticsmaterials.8 Bibliography 9EN128147:
14、2002(E) 3 Foreword ThisdocumentEN128147:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC249“Plastics“,the secretariatofwhichisheldbyIBN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyApril2003,andconflictingnationalstandar
15、dsshallbewithdrawnatthelatestby April2003. AnnexAisinformative. ThisstandardincludesaBibliography. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germa
16、ny,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN128147:2002(E) 4 1Scope ThisEuropeanStandardspecifiesthedimensions,themethodofsampling,thepreparationofthetestspecimens andtheconditionsforperformingthetensiletestwithwaistedte
17、stspecimensinordertodeterminethetensile energyweldingfactor. Atensiletestwithwaistedspecimensmaybeusedinconjunctionwithothertests(e.g.bend,tensile,tensilecreep, macro.)toassesstheperformanceofweldedassemblies,madefromthermoplasticsmaterials. Thetestisapplicabletocoaxialorcoplanarweldedassembliesmade
18、fromthermoplasticsmaterialsfilledor unfilled,butnotreinforced,irrespectiveoftheweldingprocessused.Itisnotapplicabletotubularassemblieswitha nominaloutsidediameterlessthan90mm. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normat
19、ivereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferr
20、edtoapplies(includingamendments). EN131001,Nondestructivetestingofweldedjointsofthermoplasticssemifinishedproducts Visual examination. ENISO5271, PlasticsDeterminationoftensilepropertiesPart1:Generalprinciples(ISO5271:1993). ISO5893,Rubberandplasticstestequipment Tensile,flexuralandcompressiontypes(
21、constantrateof traverse)Description. 3 Symbolsanddesignations SymbolsanddesignationsaregiveninTable1. Table1Symbolsanddesignations Symbolsandabbreviations Designations Units f e Thetensileenergyweldingfactor E w Thevalueofenergytobreakoftheweldedtest specimenusedinthecalculationof f e a Joule E r Th
22、evalueofenergytobreakoftheunweldedtest specimenstakenfromthesametestpiece,used inthecalculationof f e b Joule a n Nominalthicknessofthetestpiece millimetre D n Nominaloutsidediameterofthetube millimetre a Areaundertheload/extension curveoftheweldedtestspecimen. b Areaundertheload/extensioncurveofthe
23、unweldedtestspecimen. 4 Principleofthetest Thetestspecimenisextendedalongitsmajorlongitudinalaxisatconstantspeeduntilthetestspecimenfractures. Duringthisproceduretheloadandextensionsustainedbythetestspecimenismeasuredandtheenergytobreak iscalculated.EN128147:2002(E) 5 5 Samplingprocedures Thetestspe
24、cimens(weldedandunwelded)shallbecutperpendiculartotheweldedjointatleasteighthoursafter welding. Eachtestspecimenshallbemarkedinordertoidentifyitsoriginalpositionwithinthetestpiece. Noheattreatmentormechanicalstraighteningoperationsshallbecarriedoutonthetestspecimen. 6 Dimensionsoftestspecimens Thedi
25、mensionsoftestspecimensaregiveninFigure1. Dimensionsinmillimetres Key a Extensometergaugelength Figure1WaistedtensiletestspecimenEN128147:2002(E) 6 Wherethebeadsareleftintactinservice,theyshouldbeleftintactforthetest.Wherethebeadsareremovedin service,theyshouldberemovedpriortotesting. 7 Cuttingoftes
26、tspecimens ThetensiletestspecimensshallbecutwithparallelsidesasshowninFigure1. Duringcutting,heatingofthetestspecimenshallbeminimized. Theradiusedportionsofthetestspecimenshallbesmoothbutthesurfacefinishoftheotherremainingedgesis notcritical. Aftercutting,avisualexaminationoftheweld,accordingtoEN131
27、001,shallbecarriedoutandrecorded. 8 Mechanicaltesting Testspecimensshallbeconditionedatatemperatureof(23 2)Cfornotlessthan12hfortestspecimen thicknesseslessthanorequalto12mm,orfornotlessthan24hfortestspecimenthicknessesgreaterthan 12mm.Unlessotherwisespecified,thetemperatureofthetestspecimenatthebeg
28、inningofthetestshallbe (23 2)C. ThetestspeedsandtolerancesshallbeinaccordancewithENISO5271. ExamplesoftestspeedsforsomerelevantthermoplasticsmaterialsarelistedinannexA. Anextensometershallbeattachedtoeithersideofthespecimenwaistedsection,betweentheloadingholes(see Figure1),tomeasuretrueelongationoft
29、hespecimenduringthetest.Theextensometershallcomplywith ENISO5271. Thecompleteload/extensioncurveandfailuremode(brittle,ductileormixed)shallberecordedforeachspecimen. Atleastfivetestspecimensshallbetestedforeachweldedandunweldedtestpiece. Weldedandunweldedtestspecimensshallbeofthesamegeometryandshall
30、betestedatthesamespeed. 9 Testequipment ThetestequipmentshallconformtotherequirementsgiveninISO5893. Thecrossheaddisplacementshallbecontinuous,uniformandinaccordancewithclause8ofthisstandard. 10 Determinationofthetensileenergyweldingfactor Inordertodeterminethetensileenergyweldingfactor,weldedandunw
31、eldedtestspecimensshallbetested. Thetensileenergyweldingfactorisdeterminedfromthearithmeticmeanvaluesoftheenergytobreakofthe weldedtestspecimens( E w )andtheunweldedtestspecimens( E r ). Tensileenergyweldingfactor, r w e E E f =EN128147:2002(E) 7 ThevaluesofE w andE r aredeterminedfromtheareasundert
32、heload/extensioncurvesoftheweldedand unweldedtestspecimens,respectively,andcanbedeterminedusinganelectronicintegrator,planimeter,counting squaresorweighingthecutoutcurve. Atleasttentestspecimens(fiveweldedandfiveunwelded)shallbeusedintheevaluationofthetensileenergy weldingfactor.Notestspecimenshallb
33、edisregardedunlessfailureoccursattheloadingholes. 11 Testreport Thetestreportshallrefertothisstandardanditshallincludeatleastthefollowinginformation: a) descriptionandidentificationofthetestpieceandtestspecimens; b) appearanceofthetestpiecesbeforethetest: 1) visualexaminationofweld; 2) beadsremovedo
34、rnot; c)weld type; d) nominaloutsidediameterofthetube,ifapplicable; e) numberoftestspecimens; f) appearanceofallsurfacesofthetestspecimens,(e.g.flaws,scratches,visualimperfections); g) thicknessoftestspecimen; h) typeofextensometer; i) temperatureofthetestspecimenatthebeginningofthetest; j) roomtemp
35、eratureduringthetest; k)the crosshead speed; l) visualexaminationoftherupturedsurface(failuremode); m) calculatedindividualenergytobreakvalues; n) calculatedaverageenergytobreakvalues( w E and r E ); o) calculatedvalueofthetensileenergyweldingfactor( f e ); p) identificationofthelaboratory; q) dateo
36、fthetest; r) nameandsignatureofthepersonresponsibleforthetestreport.EN128147:2002(E) 8 Annex A (informative) Testspeedsforsomethermoplasticsmaterials ThetestspeedsusedforsomethermoplasticsmaterialsaregiveninTableA.1. TableA.1Testspeedsforsomethermoplasticsmaterials Material Speed mm/min PE 5 PP 5EN1
37、28147:2002(E) 9 Bibliography ISO13953, Polyethylene(PE)pipesandfittingsDeterminationofthetensilestrengthandfailuremodeoftest piecesfromabuttfusedjoint.BS EN 12814-7:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for pr
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