Designation:E1315–93(Reapproved2002)StandardPracticeforUltrasonicExaminationofSteelwithConvexCylindricallyCurvedEntrySurfaces1ThisstandardisissuedunderthefixeddesignationE1315;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribestheselectionofsingle-elementhard-faceultrasonicsearchunitsforwhichflat-entry-surfacereferenceblockscanbeusedforexaminationofsteelwithconvexcylindricallycurvedentrysurfaces.1.2Thescopeofthispracticeincludesthedeterminationofsearchunitcharacteristicsandradiusofsurfacecurvatureofthematerialforwhichnogaincorrectionisrequired,or,ifalargersearchunitisused,thecomputationoftheadditionalgainrequiredtoallowstandardizationwithaflatreferenceblockandexaminationonacurvedsurface.1.3Thispracticeisintendedforuseduringcontactexami-nationofconvexlycurvedsteelmaterialusingroundflatface,piezoelectricsearchunitsforlongitudinalultrasonicwavegenerationinthefrequencyrangefrom1to10MHz.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:E1316TerminologyforNondestructiveExaminations23.Terminology3.1Definitions—Fordefinitionsoftermsusedinthisprac-tice,seeTerminologyE1316.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1criticalradius,Rc—Smallestradiusofcurvatureofthematerialthatcanbeexaminedwithoutacorrectionforcurvature.Thecriticalradiusiscalculatedfrompropertiesofthesearchunit,couplantandmaterialunderexamination.ValuesofRcforvariousconditionscanbedeterminedfromtheequationsinAnnexA1.3.2.2Discussion—Forcontactexaminationusingsearchunitswithflatwearfacesonconvexsurfaces,thewidth,W,referstothewidthoftheultrasoni...
