1、Designation:D620412Standard Test Method forRubberMeasurement of Unvulcanized RheologicalProperties Using Rotorless Shear Rheometers1This standard is issued under the fixed designation D6204;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,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.1.Scope1.1 This test method covers the use of a rotorless oscillatingshear rheometer for the measurement of the flow
3、properties ofraw rubber and unvulcanized rubber compounds.These flowproperties are related to factory processing.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety conc
4、erns,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:2D1485 Practice for Rubber from Natural Sour
5、cesSampling and Sample PreparationD1646 TestMethodsforRubberViscosity,StressRelaxation,andPre-VulcanizationCharacteristics(Mooney Viscometer)D3896 Practice for Rubber From Synthetic SourcesSamplingD5289 Test Method for Rubber PropertyVulcanizationUsing Rotorless Cure MetersD6601 Test Method for Rubb
6、er PropertiesMeasurementof Cure and After-Cure Dynamic Properties Using aRotorless Shear Rheometer3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 complex shear modulus,G*,nthe ratio of peakamplitude shear stress to peak amplitude shear strain;mathematically,G*=(S*/Area)/Strain=
7、(G2+G”2)1/2.3.1.2 complex torque,S*,nthe peak amplitude torqueresponse measured by a reaction torque transducer for asinusoidally applied strain;mathematically,S*is computed byS*=(S2+S”2)1/2.3.1.3 dynamic complex viscosity*,nthe ratio of thecomplex shear modulus,G*to the oscillation frequency,inradi
8、ans per second.3.1.4 elastic torque,S,nthe peak amplitude torque com-ponent that is in phase with a sinusoidally applied strain.3.1.5 loss angle,nthe phase angle by which thecomplex torque(S*)leads a sinusoidally applied strain.3.1.6 loss factor,tan,nthe ratio of loss modulus tostorage modulus,or th
9、e ratio of viscous torque to elastictorque;mathematically,tan =G”/G=S”/S.3.1.7 loss shear modulus G”,nthe ratio of(viscous)peakamplitude shear stress to peak amplitude shear strain for thetorque component 90 out of phase with a sinusoidally appliedstrain;mathematically,G”=(S”/Area)/Peak Strain.3.1.8
10、 real dynamic viscosity,nthe ratio of the loss shearmodulus,G”to the oscillation frequency,in radians persecond.3.1.9 storage shear modulus,G,nthe ratio of(elastic)peak amplitude shear stress to peak amplitude shear strain forthe torque component in phase with a sinusoidally appliedstrain;mathematic
11、ally,G=(S/Area)/Peak Strain.3.1.10 viscous torque,S”,nthe peak amplitude torquecomponent,which is 90 out of phase with a sinusoidallyapplied strain.4.Summary of Test Method4.1 A rubber test specimen is contained in a die cavity thatis closed and maintained at an elevated temperature.The cavityis for
12、med by two dies,one of which is oscillated through arotary amplitude.This action produces a sinusoidal torsionalstrain in the test specimen,resulting in a sinusoidal torque,which measures a viscoelastic quality of the test specimen.The1This test method is under the jurisdiction of ASTM Committee D11
13、 on Rubberand is the direct responsibility of Subcommittee D11.12 on Processability Tests.Current edition approved Dec.15,2012.Published January 2013.Originallyapproved in 1997.Last previous edition approved in 2007 as D6204 07.DOI:10.1520/D6204-12.2For referenced ASTM standards,visit the ASTM websi
14、te,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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 test sp
15、ecimen can be either a raw natural or synthetic rubber oran uncured rubber compound.4.2 These viscoelastic measurements can be made based on(1)a frequency sweep,in which the frequency is programmedto change in steps under constant strain amplitude and tem-perature conditions,(2)a strain sweep,in whi
16、ch the strainamplitude is programmed to change in steps under constantfrequency and temperature conditions,or(3)a temperaturesweep,in which the temperature is programmed to eitherincrease or decrease under constant strain amplitude andfrequency conditions.A timed test may also be performed inwhich a sinusoidal strain is applied for a given time periodunder constant strain amplitude,frequency,and temperatureconditions.4.2.1 For a frequency sweep test,the instrument is typicallyprogrammed to incre
