Designation:C1331−01(Reapproved2012)StandardTestMethodforMeasuringUltrasonicVelocityinAdvancedCeramicswithBroadbandPulse-EchoCross-CorrelationMethod1ThisstandardisissuedunderthefixeddesignationC1331;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesaprocedureformeasurementofultrasonicvelocityinstructuralengineeringsolidssuchasmonolithicceramics,toughenedceramics,andceramicmatrixcomposites.1.2Thistestmethodisbasedonthebroadbandpulse-echocontactultrasonicmethod.Theprocedureinvolvesacomputer-implemented,frequency-domainmethodforprecisemeasure-mentoftimedelaysbetweenpairsofechoesreturnedbythebacksurfaceofatestsampleorpart.1.3Thistestmethoddescribesaprocedureforusingadigitalcross-correlationalgorithmforvelocitymeasurement.Thecross-correlationfunctionyieldsatimedelaybetweenanytwoechowaveforms(1).22.ReferencedDocuments2.1ASTMStandards:3B311TestMethodforDensityofPowderMetallurgy(PM)MaterialsContainingLessThanTwoPercentPorosityC373TestMethodforWaterAbsorption,BulkDensity,ApparentPorosity,andApparentSpecificGravityofFiredWhitewareProducts,CeramicTiles,andGlassTilesE494PracticeforMeasuringUltrasonicVelocityinMateri-alsE1316TerminologyforNondestructiveExaminations2.2ASNTDocument:RecommendedPracticeSNT-TC-1AforNondestructiveTestingPersonnelQualificationandCertification42.3MilitaryStandard:MIL-STD-410NondestructiveTestingPersonnelQualifica-tionandCertification52.4Additionalreferencesarecitedinthetextandatendofthisdocument.3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1backsurface—thesurfaceofatestsamplewhichisoppositetothefrontsurfaceandfromwhichbacksurfaceechoesarereturnedatnormalincidencedirectlytothetrans-ducer.3.1.2bandwidth—thefrequencyrangeofanultrasonicprobe,definedbyconventionasthedifferencebetweenthelowerandupperfr...
