【astm標(biāo)準(zhǔn)】d 1894 - 14_第1頁
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1、Designation:D1894?14StardTestMethodfStaticKiicCoefficientsofFrictionofPlasticFilmSheeting1ThisstardisissuedunderthefixeddesignationD1894thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecase

2、ofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheU.S.DepartmentofDefens

3、e.1.Scope1.1Thistestmethodcoversdeterminationofthecoefficientsofstartingslidingfrictionofplasticfilmsheetingwhenslidingoveritselfothersubstancesatspecifiedtestconditions.Theprocedurepermitstheuseofastationarysledwithamov

4、ingplaneamovingsledwithastationaryplane.Bothproceduresyieldthesamecoefficientsoffrictionvaluesfagivensample.NOTE1—FthefrictionalacteristicsofplasticfilmspartiallywrappedaroundacylindercapstanseeTestMethodG143underthejuri

5、sdictionofASTMSubcommitteeG02.50.1.2Testdataobtainedbythistestmethodisrelevantappropriatefuseinengineeringdesign.1.2.1Asanoptiontothistestcoefficientoffrictionmayberunattemperaturesotherthan23Cbyheatingonlytheplanewhilet

6、hesledisatambienttemperature.1.3ThevaluesstatedinSIunitsaretoberegardedasstard.Thevaluesgiveninparenthesesarefinfmationonly.1.4Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsi

7、bilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.Faspecificprecautionarystatementseetheendof6.5.NOTE2—ThistestmethodisnotequivalenttoISO8295–1995

8、resultscannotbedirectlycomparedbetweenthetwomethods.2.ReferencedDocuments2.1ASTMStards:2D618PracticefConditioningPlasticsfTestingD883TerminologyRelatingtoPlasticsD1894TestMethodfStaticKiicCoefficientsofFrictionofPlasticF

9、ilmSheetingD3574TestMethodsfFlexibleCellularMaterials—SlabBondedMoldedUrethaneFoamsD4000ClassificationSystemfSpecifyingPlasticMaterialsE177PracticefUseoftheTermsPrecisionBiasinASTMTestMethodsE691PracticefConductinganInte

10、rlabatyStudytoDeterminethePrecisionofaTestMethodG143TestMethodfMeasurementofWebRollerFrictionacteristics2.2ISOStard:ISO8295–199533.Terminology3.1Definitions:3.1.1frictionn—resistancetorelativemotionbetweentwobodiesincont

11、act.3.1.1.1coeff?cientoffriction—theratioofthefcerequiredtomoveonesurfaceoveranothertothetotalfceappliednmaltothosesurfaces.3.1.1.2kiiccoeff?cientoffriction—theratioofthefcerequiredtomoveonesurfaceoveranothertothetotalfc

12、eappliednmaltothosesurfacesoncethatmotionisinprogress.3.1.1.3staticcoeff?cientoffriction—theratioofthefcerequiredtomoveonesurfaceoveranothertothetotalfceappliednmaltothosesurfacesattheinstantmotionstarts.3.2Definitionsof

13、TermsSpecifictoThisStard:3.2.1slip—inplasticfilmslubricityoftwosurfacesslidingincontactwitheachother.4.SignificanceUse4.1Measurementsoffrictionalpropertiesmaybemadeonafilmsheetingspecimenwhenslidingoveritselfover1Thistes

14、tmethodisunderthejurisdictionofASTMCommitteeD20onPlasticsisthedirectresponsibilityofSubcommitteeD20.19onFilmSheetingMoldedProducts.CurrenteditionapprovedMarch12014.PublishedMarch2014.iginallyapprovedin1961.Lastprevioused

15、itionapprovedin2011asD189411ε1.DOI:10.1520D189414.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite

16、.3AvailablefromAmericanNationalStardsInstitute(ANSI)25W.43rdSt.4thFloNewYkNY10036:www.ansi.g.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA1942829

17、59.UnitedStates1capacitygaugewith10gsmallersubdivisionswillbesatisfacty.Thisspringwillmeasurecoefficientsoffrictionuptoincluding2.5.5.10SupptingBase—Asmoothwoodmetalbaseapproximately200by380mm(8by15in.)isnecessarytosuppt

18、theplane.Thesupptingbasemaybeasimplerectangularbox.Ifauniversaltestingmachineisusedtopullamovingplaneasupptingbaseofsufficientstructuralstrengthrigiditytomaintainafirmpositionbetweenthemovingcrossheadthefcemeasuringdevic

19、ewillbenecessary.5.11DrivingPullingDevicefSledPlane—Theplanemaybepulledbyadrivenpairofrubbercoatedrollsnotlessthan200mm(8in.)longcapableofmaintainingaunifmsurfacespeed150630mmmin(0.560.1ftmin)(Fig.1(b))bythecrossheadofau

20、niversaltestingmachine(Fig.1(d))(seeNote6)awmdrivedrivenwithasynchronousmot(Fig.1(e)).Aconstantspeedchaindrivesystemhasalsobeenfoundsatisfacty(Fig.1(a)).Apoweroperatedsourcemaybeusedfpullingthesledoverthehizontallymounte

21、dspecimenataunifmspeedof150630mmmin(0.560.1ftmin).Auniversaltestingmachineequippedwithaloadcellinitsuppercrossheadaconstantrateofmotionlowercrossheadhasbeenfoundsatisfacty(seeFig.1(c)).NOTE6—Wherethemovingcrossheadofauni

22、versaltestingmachineisusedtopullthemovingplanethroughapulleysystem(Fig.1(d))thestraingaugeloadcellotherloadsensinginstrumentinthetestingmachineactsasthefcemeasuringdevice.6.TestSpecimens6.1Thetestspecimenthatistobeattach

23、edtotheplaneshallbecutapproximately250mm(10in.)inthemachinedirection130mm(5in.)inthetransversedirectionwhensuchextrusiondirectionsexistareidentifiable.6.2Afilmspecimenthatistobeattachedtothesledshallbecutapproximately120

24、mm(41?2in.)square.FilmisdefinedasA.SledH.ConstantspeeddriverollsB.PlaneI.NylonmonofilamentC.SupptingbaseJ.LowfrictionpulleyD.GaugeK.WmscrewE.SpringgaugeL.HalfnutF.ConstantspeedchaindriveM.HysteresissynchronousmotG.Consta

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