Designation:G32−16StandardTestMethodforCavitationErosionUsingVibratoryApparatus1ThisstandardisissuedunderthefixeddesignationG32;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheproductionofcavitationdamageonthefaceofaspecimenvibratedathighfrequencywhileimmersedinaliquid.Thevibrationinducestheforma-tionandcollapseofcavitiesintheliquid,andthecollapsingcavitiesproducethedamagetoanderosion(materialloss)ofthespecimen.1.2Althoughthemechanismforgeneratingfluidcavitationinthismethoddiffersfromthatoccurringinflowingsystemsandhydraulicmachines(see5.1),thenatureofthematerialdamagemechanismisbelievedtobebasicallysimilar.Themethodthereforeoffersasmall-scale,relativelysimpleandcontrollabletestthatcanbeusedtocomparethecavitationerosionresistanceofdifferentmaterials,tostudyindetailthenatureandprogressofdamageinagivenmaterial,or—byvaryingsomeofthetestconditions—tostudytheeffectoftestvariablesonthedamageproduced.1.3Thistestmethodspecifiesstandardtestconditionscoveringthediameter,vibratoryamplitudeandfrequencyofthespecimen,aswellasthetestliquidanditscontainer.Itpermitsdeviationsfromsomeoftheseconditionsifproperlydocumented,thatmaybeappropriateforsomepurposes.Itgivesguidanceonsettingupasuitableapparatusandcoverstestandreportingproceduresandprecautionstobetaken.Italsospecifiesstandardreferencematerialsthatmustbeusedtoverifytheoperationofthefacilityandtodefinethenormalizederosionresistanceofothertestmaterials.1.4AhistoryofthistestmethodisgiveninAppendixX4,followedbyacomprehensivebibliography.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappr...
