ISO 9538 2025.docx

ISOInternationalStandardISO9538Thirdedition2025-06AerospaceseriesHydraulictubingjointsandfittingsPlanarflexuretestSerieaerospatialeJointsetraccordsdestuyauterieshydrauliquesEssaideflexionplaneReferencenumberISO9538:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordivIntroductionv1 Scope12 Normativereferences13 Termsanddefinitions14 Deviceforflexuretest15 Flexuretestspecimens36 Stressdetermination37 Procedure47.1 Instrumentationandstraingauges47.2 Frequency57.2.1 Testfrequency57.2.2 Naturalfrequencyofthespecimens57.2.3 Verificationofthenaturalfrequency57.3 Bendingstresscalibrationoftestspecimen57.4 Test58 Requirements5Bibliography7ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.HoweverlImplementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT工seeWWW.iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC20,Aircraftandspacevehicles,SubcommitteeSC10,Aerospacefluidsystemsandcomponents.Thisthirdeditioncancelsandreplacesthesecondedition(ISO9538:2017),whichhasbeentechnicallyrevised.Themainchangesareasfollows:ClaUSe4andCIaUSe7wereupdated.Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheuser'snationalstandardsbody.AcompletelistingofthesebodiescanbefoundatWWW.iso.org/members.htmLIntroductionThetestproceduredescribedcanbeappliedasanalternativetotherotarytestprocedurespecifiedinISO7257.ThequalificationtestproceduresfortubefittingsarespecifiedinISO7169.Othertestmethodscanbeusedaslongastheydevelopthesameresultsastheprocedurespecifiedinthisdocument.AerospaceseriesHydraulictubingjointsandfittings一Planarflexuretest1 ScopeThisdocumentspecifiesaplanarflexuretestprocedureforreconnectableandpermanenthydraulictubejointsandfittings.Thisprocedureisintendedforconductingflexuretestsonfittingswithhigh-strengthhydraulictubesmadeofcorrosion-resistingSteeLtitaniumandaluminiumforuseoncommercialandmilitaryaircraft.2 NormativereferencesTherearenonormativereferencesinthisdocument.3 TermsanddefinitionsNotermsanddefinitionsarelistedinthisdocument.ISOandIECmaintainterminologydatabasesforuseinstandardizationatthefollowingaddresses: ISOOnlinebrowsingplatform:availableathttps:WWW.iso.org/obp IECElectropedia:availableathttps:WWW.electropedia.org/4DeviceforflexuretestThetestdeviceshouldbesimilartothatshowninFigUreLItshallconsistofavibrator,amanifoldtoreceivethetestspecimens,andahydraulicsupplyunitcapableofconstantlymaintainingthestaticoperatingpressureduringtesting,includingmonitorsinducingtheshutdownofthesystemintheeventofpressuredrop.Thenumberoftestspecimensshallbedefinedbythespecificationusedtoqualifythefitting.Key1pressuresupply2pressuregauge3testspecimenFigure 1 Set-upoftestdriveThetestsp