ASTM_G_73_-_10.pdf

Designation:G7310Standard Test Method forLiquid Impingement Erosion Using Rotating Apparatus1This standard is issued under the fixed designation G73;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers tests in which solid specimensare eroded or otherwise damaged by repeated discrete impactsof liquid drops or jets.Among the collateral forms of damageconsidered are degradation of optical properties of windowmaterials,and penetration,separation,or destruction of coat-ings.The objective of the tests may be to determine theresistance to erosion or other damage of the materials orcoatings under test,or to investigate the damage mechanismsand the effect of test variables.Because of the specializednature of these tests and the desire in many cases to simulate tosome degree the expected service environment,the specifica-tion of a standard apparatus is not deemed practicable.This testmethod gives guidance in setting up a test,and specifies testand analysis procedures and reporting requirements that can befollowed even with quite widely differing materials,testfacilities,and test conditions.It also provides a standardizedscale of erosion resistance numbers applicable to metals andother structural materials.It serves,to some degree,as atutorial on liquid impingement erosion.1.2 The values stated in SI units are to be regarded asstandard.The inch-pound units in parentheses are provided forinformation.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1003 Test Method for Haze and Luminous Transmittanceof Transparent PlasticsE92 Test Method for Vickers Hardness of Metallic Materials(Withdrawn 2010)3E140 Hardness Conversion Tables for Metals RelationshipAmong Brinell Hardness,Vickers Hardness,RockwellHardness,Superficial Hardness,Knoop Hardness,Sclero-scope Hardness,and Leeb HardnessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE179 Guide for Selection of Geometric Conditions forMeasurement of Reflection and Transmission Propertiesof MaterialsG1 Practice for Preparing,Cleaning,and Evaluating Corro-sion Test SpecimensG32 Test Method for Cavitation Erosion Using VibratoryApparatusG40 Terminology Relating to Wear and ErosionG134 Test Method for Erosion of Solid Materials by Cavi-tating Liquid Jet2.2 Military Standards:4MIL-C-83231 Coatings,Polyurethane,Rain Erosion Resis-tance for Exterior Aircraft and Missile Plastic PartsMIL-P-8184 Plastic Sheet,Acrylic,Modified3.Terminology3.1 See Terminology G40 for definitions of terms that arenot defined below in either 3.2 or 3.3.Definitions appear in 3.2that are taken from Terminology G40 for important termsrelated to the title,Scope,or Summary of this test method.Definitions of Terms Specific to this Test Method are given in3.3 that are not in Terminology G40.3.2 Definitions:3.2.1 All definitions listed below are quoted from Terminol-ogy G4005(some modified).3.2.2 cumulative erosion-time curve,nin cavitation andimpingement erosion,a plot of cumulative erosion versuscumulative exposure duration,usually determined by periodicinterruption of the test and weighing of the specimen.This istheprimaryrecordofanerosiontest.Mostother1This test method is under the jurisdiction of ASTM Committee G02 on Wearand Erosion and is the direct responsibility of Subcommittee G02.10 on Erosion bySolids and Liquids.Current edition approved April 1,2010.Published May 2010.Originallyapproved in 1982.Last previous edition approved in 2004 as G7304.DOI:10.1520/G0073-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 characteristics,such as the incubation period,maximum ero-sion rate,terminal erosion rate,and erosion rate-time curve,arederived from it.3.2.3 damage,nin cavitation or impingement,any effecton a solid body resulting from its exposure to these phenom-ena.This may include loss of material,surface deformation,orany other changes in microstructure,properties,or appearance.3.2.3.1 DiscussionThis term as here defined should no