1、BRITISH STANDARD AEROSPACE SERIES BS EN 2743:2002 Fibre reinforced plastics Standard procedures for conditioning prior to testing unaged materials The European Standard EN 2743:2001 has the status of a British Standard ICS 49.025.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT
2、LAWBS EN 2743:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 11 January 2002 BSI 11 January 2002 ISBN 0 580 37996 5 National foreword Thi
3、s British Standard is the official English language version of EN 2743:2001. The UK participation in its preparation was entrusted to Technical Committee ACE/64, Aerospace structural reinforced plastics, which has the responsibility to: A list of organizations represented on this committee can be ob
4、tained 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 Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find”
5、 facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal o
6、bligations. aid enquirers to understand the text; present to the responsible 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 Th
7、is document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, 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 CommentsEUROPEANSTANDAR
8、D NORMEEUROPENNE EUROPISCHENORM EN2743 December2001 ICS49.025.40 Englishversion AerospaceseriesFibrereinforcedplasticsStandard proceduresforconditioningpriortotestingunagedmaterials SriearospatialePlastiquesrenforcsdefibres Procduresnormalisespourleconditionnementavant essaissurmatriauxnonvieillis L
9、uftundRaumfahrtFaserverstrkteKunststoffe StandardverfahrenfrVorbehandlungvorderPrfungvon nichtgealtertenWerkstoffen ThisEuropeanStandardwasapprovedbyCENon2May2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanat
10、ionalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation underther
11、esponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,
12、SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN2743:2001EEN2743:2001(E) 2 Fo
13、reword ThisEuropeanStandardhasbeenpreparedbytheEuropeanAssociationofAerospaceManufacturers (AECMA). AfterinquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitsprese
14、ntationtoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyJune2002,andconflictingnationalstandardsshallbewithdrawnat thelatestbyJune2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationso
15、fthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal, Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN2743:2001(E) 3 1 Scope Thisstandardspecifiesthestandardproce
16、duresforconditioningpriortotestingunagedfibrereinforced plasticmaterialsincludingreinforcingfibresand cured resin systems for aerospace applications. NOTE Inthecaseofuncuredpreimpregnatematerials,requirementsforconditioningbeforetestingare specifiedintherelevanttechnicalspecificationortestmethod. 2
17、Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisE
18、uropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN 3615 AerospaceseriesFibrereinforcedplasticsProcedureforthedeterminationofthe conditionsofexposuretohumidatmosphereandthedeterminationofmoistureabsorption 1) 3 Defin
19、itions Forthepurposesofthisstandard,thefollowingdefinitionsapply. 3.1 Conditioning Thewholeseriesofoperationsintendedtobringasampleorspecimensintoastateofequilibriumwith regardtotemperatureortemperatureandhumidity. 3.2 Ascuredcondition Theconditionofaspecimenorsampledirectlyaftermanufacture,thewater
20、contentof whichhasnever exceeded10%ofthemaximummoistureabsorption at a relative humidity of 85%. 4 Principle Exposureofanunagedmaterialinaconditioningatmospherewhichallowsittobemaintainedintheas cured condition or restored as near to the ascured condition as possible. 5 Apparatus 5.1 Climaticchamber
21、capableofmaintainingthespecifiedtemperatureandrelativehumidity,if required. 5.2 Sealedcontainersuchasmetallizedpolyethylenebagorairtightmetalbox 5.3 Desiccantsaltbagssuchasphosphoruspentoxide 5.4 Cleananddryabsorbentclothorfilterpaper 1) PublishedasAECMAPrestandardatthedateofpublicationofthisstandar
22、dEN2743:2001(E) 4 6 Standardatmospheres Theatmosphericpressureshall bebetween86kPaand106kPa. 6.1 Nominaltemperatureandhumidity 6.1.1 Wherethecontrolofbothtemperatureandhumidityisnecessary:23C,50%relativehumidity 6.1.2 Whereonlythecontroloftemperatureisnecessary:23C,ambienthumidity 6.1.3 Wherenocontr
23、oloftemperatureandhumidityisnecessary:ambientatmosphere 6.2 Tolerances 6.2.1 Temperature Standardtolerance: 2C(nocode). Closetolerance: 1C(codeT). 6.2.2 Relativehumidity Standardtolerance: 5%(nocode). Closetolerance: 2%(codeH). 7 Choice ofconditioningtypes Seetable1. Table1 Material Fibrereinforcedp
24、lasticsandcured resinsystems Reinforcingfibres Codeofconditioningtype A B C D TemperatureC 23 23 Relativehumidity% Ambient 50 Ambient Ambient Tolerancecode Nocode See6.2.1and 6.2.2 See6.2.1 Nocode Durationh 168 a 2 2 Remarks Ascured condition (see3.2) Conditiontobe usedunless otherwise specified a S
25、eetestmethodorproductstandard.EN2743:2001(E) 5 8 Procedure Theprocedureforhandlingspecimensorsamplesshallbeconductedsothatthemoistureabsorption: issufficientlylowtohaveanegligibleeffectonthecaracteristics; or remainsconstanttoallowreproducibilityofthetests. 8.1 Conditioningtype A Allpanelsandspecime
26、nsshallbestoredinthesealedcontainercontainingdesiccantsaltbags. Thetotalcumulativetimethatthepanelremainsoutsidethesealedcontainer,formachiningorother operations,shallnotexceed8h.Incaseswherewetmachiningisused,thespecimensshallbecleanedand wipeddryimmediatelyon completion. Specimensintheascuredcondi
27、tionshallbetestedwithin168hfromthedemouldingoperation.Ifthistime isexceeded,themoistureabsorptionshallbeconfirmedasbeinglessthan10%ofthemaximummoisture absorptionachievedduringexposureat85%relativehumidity. ThemaximummoistureabsorptionisobtainedatequilibriumaccordingtoEN3615. Wherethespecimenshaveex
28、ceeded10%ofthemaximummoistureabsorption,the as curedcondition shallberestored by drying in accordance with EN3615B. This operation is only allowed once. 8.2 ConditioningtypeB Seetable1. 8.3 ConditioningtypesCandD Seetable1. Thespecimensshallbesupportedinsuchawaytoensuremaximumexposureduringcondition
29、ing. 9 Designation EXAMPLE: EN2743BTH Numberofthisstandard Conditioningtype(see7) Temperaturetolerancecode(ifapplicable,seetable1) Humiditytolerancecode(ifapplicable,seetable1)EN2743:2001(E) 6 10 Report Itshallincludethefollowing: designation(see9); alldataensuringthetraceabilityofthematerial(tradem
30、ark,identificationmarking,dateofreceipt, batchnumber,etc.); conditioningtime(ifapplicable); maximummoistureabsorptionmeasuredtoEN3615,at85%ofrelativehumidity(ifapplicable); fulldescriptionofthedryinginaccordancewithEN3615B(ifapplicable)andresults; anyincidentwhichmayhaveaffectedtheresults.BS EN 2743
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