1、Designation:D468313Standard Test Method forMeasuring Viscosity of New and Used Engine Oils at HighShear Rate and High Temperature by Tapered BearingSimulator Viscometer at 150 C1This standard is issued under the fixed designation D4683;the number immediately following the designation indicates the y
2、ear oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Departme
3、nt of Defense.1.Scope*1.1 This test method covers the laboratory determination ofthe viscosity of engine oils at 150 C and 1.0106s1using aviscometer having a slightly tapered rotor and stator called theTapered Bearing Simulator(TBS)Viscometer.21.2 The Newtonian calibration oils used to establish thi
4、s testmethod range from approximately 1.2 mPas to 7.7 mPas at150 C.The precision has only been determined for theviscosity range 1.47 mPas to 5.09 mPas at 150 C for thematerials listed in the precision section.1.3 The non-Newtonian reference oil used to establish theshear rate of 1.0106s1for this te
5、st method has a viscosityclosely held to 3.55 mPas at 150 C by using the absoluteviscometry of the TBS.1.4 Manual,semi-automated,and fully automated TBSviscometers were used in developing the precision statementfor this test method.1.5 Application to petroleum products such as base oils andformulate
6、d engine oils was determined in preparing the visco-metric information for this test method.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6.1 This test method uses the milliPascalsecond(mPas)as the unit of viscosity.This
7、unit is equivalent to the centipoise(cP).1.7 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 li
8、mitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D4741 Test Method for Measuring Viscosity at High Tem-perature and High Shear Rate by Tapered-Plug ViscometerD5481 Test Method for Measuring Apparent Viscosity atHigh-Temperature and High-Shear Rate by Multicell Cap-illary ViscometerD6
9、300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material3.Terminology3.1 Definiti
10、ons:3.1.1 apparent viscosity,nviscosity of a non-Newtonianliquid determined by this test method at a particular shear rateand shear stress.3.1.2 Newtonian oil or liquid,noil or liquid that at a giventemperature exhibits a constant viscosity at all shear rates andshear stresses.3.1.3 non-Newtonian oi
11、l or liquid,noil or liquid thatexhibits a viscosity that varies with changing shear stress andshear rate.3.1.4 shear rate,nvelocity gradient in liquid flow inmillimetres per second per millimetre(mm/s per mm)resultingfrom applied shear stress.The System International(SI)unitfor shear rate is recipro
12、cal seconds,s-1.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved Oct.1,2013.Published November 2013.Originallyapproved in 1987.Last pre
13、vious edition approved in 2010 as D4683 10.DOI:10.1520/D4683-13.2The sole source of supply of the apparatus known to the committee at this timeis Tannas Co.,4800 James Savage Rd.,Midland,MI 48642.If you are aware ofalternative suppliers,please provide this information to ASTM InternationalHeadquarte
14、rs.Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.3For 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
15、 to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.4.1 DiscussionThe velocity gradient in the taperedbearing simu
16、lator viscometer is constant at any chosen rotor-stator gap and rotor speed.3.1.5 shear stress,nforce per unit area causing liquid flowover the area where viscous shear is being caused;in SI,theunit of shear stress is the Pascal(Pa).3.1.6 viscosity,nratio of applied shear stress and theresulting rate of shear.It is sometimes called dynamic orabsolute viscosity.Viscosity is a measure of the resistance toflow of the liquid at a given temperature.In SI,the unit ofviscosity is the Pascalsecond(Pas),
