1、Designation:D602219Standard Practice forCalculation of Permanent Shear Stability Index1This standard is issued under the fixed designation D6022;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice specifies the procedure for the calculationof Permanent Shear Stability Index(PSSI)of an additive usingviscosities before and after a sh
3、earing procedure.1.2 PSSI is calculated for a single blend component and canthen be used to estimate the effects of that component onfinished lubricant blends.1.3 This practice is applicable to many products and mayuse data from many different test methods.The calculation ispresented in its most gen
4、eral form in order not to restrict itsuse.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the Worl
5、d Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D2603 Test Method for Sonic Shear Stability of Polymer-Containing OilsD4485 Specification for Performance of Active API ServiceCategory Engine OilsD5275 Test Method for Fuel Injector Shear Stabili
6、ty Test(FISST)for Polymer Containing FluidsD5621 Test Method for Sonic Shear Stability of HydraulicFluidsD6278 Test Method for Shear Stability of Polymer Contain-ing Fluids Using a European Diesel Injector ApparatusD6709 Test Method for Evaluation of Automotive EngineOils in the Sequence VIII Spark-
7、Ignition Engine(CLR OilTest Engine)D7109 Test Method for Shear Stability of Polymer-Containing Fluids Using a European Diesel Injector Ap-paratus at 30 Cycles and 90 Cycles2.2 CEC Standards:3CEC L-14-93 Evaluation of the Mechanical Shear Stabilityof Lubricating Oils Containing PolymersCEC L-45-99 Vi
8、scosity Shear Stability of TransmissionLubricants(KRL)3.Terminology3.1 Definitions:3.1.1 degree of thickening(DT),nthe ratio of an oilsviscosity with an additive to that oils viscosity without theadditive.A measure of the amount by which an additiveincreases the base fluid viscosity.3.1.2 permanent
9、shear stability index(PSSI),na measureof the irreversible decrease,resulting from shear,in an oilsviscosity contributed by an additive.3.1.2.1 DiscussionPSSI is a property calculated for asingle component.Viscosity Loss(q.v.)is a property measuredfor a finished oil.3.1.3 shear,adja relative movement
10、 of molecules ormolecular aggregates that occurs in flowing liquids.A shearflow is one in which the spatial velocity gradient is perpen-dicular to the direction of flow.3.1.3.1 DiscussionNot all flow geometries meet this defi-nition.3.1.4 shear,vto subject a liquid to a shear flow.3.1.4.1 Discussion
11、Shearing an oil can sometimes causescission of certain molecular species,resulting in a decrease inviscosity.Not all oils exhibit this response.Common ways ofshearing oils to elicit this effect include injection through asmall orifice and flow through gears or bearings.Irradiationwith sonic energy c
12、an also decrease the viscosity of some oils.3.1.5 Viscosity Loss(VL),na measure of the decrease inan oils viscosity.3.1.5.1 DiscussionViscosity Loss is a property measuredfor a finished oil.Permanent Shear Stability Index(q.v.)is aproperty calculated for a single component.Some test methodsreport VL
13、 as a relative change,which is dimensionless(for1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.07 on Flow Properties.Current edition approved Dec.1,2019.Published January 2020.Origi
14、nallyapproved in 1996.Last previous edition approved in 2012 as D6022 06(2012).DOI:10.1520/D6022-19.2For 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 Documen
15、t Summary page onthe ASTM website.3Available from Organization for Economic Cooperation and Development,Madou Plaza,Place Madou 1,B-1030 Brussels,Belgium.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,
16、PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.example,Test Methods D2603,D5275,D6278,and D7109).Some test methods and specifications report VL as an absolutechange,which has the same dimensions as the visc
