ASTM E647-11 Measurement of Fatigue Crack Growth Rates

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1、Designation:E64711StandardTestMethodfor1MeasurementofFatigueCrackGrowthRatesThisstandardisissuedundertheÞxeddesignationE647;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatesthey

2、earoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scopecialrequirementsfortestinginaqueousenvironments,and1.1Thistestmethod2coversthedeterminationoffatigueproceduresfornon-visualcracksizedetermination.Inaddition,crackgrowthrat

3、esfromnear-thresholdtoKcontrolledthereareappendicesthatcovertechniquesforcalculatingmaxinstability.Resultsareexpressedintermsofthecrack-tipda/dN,determiningfatiguecrackopeningforce,andguidelinesstress-intensityfactorrange(DK),deÞnedbythetheoryofformeasuringthegrowthofsmallfatigu

4、ecracks.Generallinearelasticity.informationandrequirementscommontoallspecimentypes1.2Severaldifferenttestproceduresareprovided,theopti-arelistedasfollows:mumtestprocedurebeingprimarilydependentonthemagni-SectionReferencedDocuments2tudeofthefatiguecrackgrowthratetobemeasured.Term

5、inology31.3MaterialsthatcanbetestedbythistestmethodarenotSummaryofUse4limitedbythicknessorbystrengthsolongasspecimensareofSigniÞcanceandUse5Apparatus6sufficientthicknesstoprecludebucklingandofsufficientSpecimenConÞguration,Size,andPreparation7planarsizetoremainpredominantlyelast

6、icduringtesting.Procedure81.4ArangeofspecimensizeswithproportionalplanarCalculationsandInterpretationofResults9Report10dimensionsisprovided,butsizeisvariabletobeadjustedforPrecisionandBias11yieldstrengthandappliedforce.SpecimenthicknessmaybeSpecialRequirementsforTestinginAqueous

7、EnvironmentsAnnexA4variedindependentofplanarsize.GuidelinesforUseofCompliancetoDetermineCrackSizeAnnexA5GuidelinesforElectricPotentialDifferenceDeterminationofAnnexA61.5ThedetailsofthevariousspecimensandtestconÞgu-CrackSizerationsareshowninAnnexA1-AnnexA3.SpecimenconÞgu-Recommen

8、dedDataReductionTechniquesAppendixX1rationsothe