2024年4月24日发(作者：诸葛闵)
Designation:D6272–02
StandardTestMethodfor
FlexuralPropertiesofUnreinforcedandReinforcedPlastics
andElectricalInsulatingMaterialsbyFour-PointBending
1
ThisstandardisissuedunderthefixeddesignationD6272;thenumberimmediatelyfollowingthedesignationindicatestheyearof
originaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflastreapproval.A
superscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.
*
1.1Thistestmethodcoversthedeterminationofflexural
propertiesofunreinforcedandreinforcedplastics,including
high-moduluscompositesandelectricalinsulatingmaterialsin
theformofrectangularbarsmoldeddirectlyorcutfromsheets,
plates,estmethodsaregenerally
r,flexural
strengthcannotbedeterminedforthosematerialsthatdonot
breakorthatdonotfailintheouterfistmethod
utilizesafourpointloadingsystemappliedtoasimply
supportedbeam.
1.2Thistestmethodmaybeusedwithtwoprocedures:
1.2.1ProcedureA,designedprincipallyformaterialsthat
breakatcomparativelysmalldeflections.
1.2.2ProcedureB,designedparticularlyforthosematerials
thatundergolargedeflectionsduringtesting.
1.2.3ProcedureAshallbeusedformeasurementofflexural
properties,particularlyflexuralmodulus,unlessthematerial
specifiureBmaybeusedfor
measurementofflexuralstrength.
1.3Comparativetestsmayberunaccordingtoeither
procedure,providedthattheprocedureisfoundsatisfactoryfor
thematerialbeingtested.
1.4ThevaluesstatedinSIunitsaretoberegardedasthe
uesprovidedinparenthesesareforinforma-
tiononly.
1.5Thisstandarddoesnotpurporttoaddressallofthe
safetyconcerns,ifany,e
responsibilityoftheuserofthisstandardtoestablishappro-
priatesafetyandhealthpracticesanddeterminetheapplica-
bilityofregulatorylimitationspriortouse.
N
OTE
1—Thistestmethodisequivalentto,butnotidenticaltoISO
14125(MethodB).
D638TestMethodforTensilePropertiesofPlastics
2
D790TestMethodforFlexuralPropertiesofUnreinforced
andReinforcedPlasticsandElectricalInsulatingMateri-
als
2
D883TerminologyRelatingtoPlastics
2
D4000ClassificationSystemforSpecifyingPlasticMate-
rials
3
D4066ClassificationSystemforNylonInjectionandEx-
trusionMaterials(PA)
3
D5947TestMethodsforPhysicalDimensionsofSolid
PlasticSpecimens
2
E4PracticesforForceVerificationofTestingMachines
4
E83PracticeforVerificationandClassificationofExten-
someters
4
E691PracticeforConductinganInterlaboratoryStudyto
DeterminethePrecisionofaTestMethod
5
2.2ISOStandard:
6
ISO14125(MethodB)
ology
3.1Definitions:
3.1.1Definitionsoftermsapplyingtothesetestmethods
appearinTerminologyD883andAnnexA2ofTestMethod
D638.
yofTestMethod
4.1Abarofrectangularcrosssectionrestsontwosupports
andisloadedattwopoints(bymeansoftwoloadingnoses),
distancebetweentheloadingnoses(theloadspan)iseitherone
thirdoronehalfofthesupportspan(seeFig.1).Asupport
span-to-depthratioof16:1shallbeusedunlessthereisreason
tosuspectthatalargerspan-to-depthratiomayberequired,as
maybethecaseforcertainlaminatedmaterials(seeSection7
andNote8forguidance).
4.2Thespecimenisdeflecteduntilruptureoccursinthe
outerfibersoruntilthemaximumfiberstrain(see12.7)of5%
isreached,whicheveroccursfirst.
AnnualBookofASTMStandards,Vol08.02.
AnnualBookofASTMStandards,Vol03.01.
5
AnnualBookofASTMStandards,Vol14.02.
6
AvailablefromAmericanNationalStandardsInstitute,25W.43rdSt.,4th
Floor,NewYork,NY10036.
4
3
ncedDocuments
2.1ASTMStandards:
D618PracticeforConditioningPlasticsforTesting
2
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
andisthedirectresponsibilityofSubcommitteeD20.10onMechanicalProperties.
CurrenteditionapprovedApril10,ally
publishedasD6272–eviouseditionD6272–00.
2
AnnualBookofASTMStandards,Vol08.01.
1
*ASummaryofChangessectionappearsattheendofthisstandard.
Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.
1
FIG.1LoadingDiagram
ficanceandUse
5.1Flexuralpropertiesdeterminedbythistestmethodare
especiallyusefulforqualitycontrolandspecificationpurposes.
5.2Thistestmethodmaybemoresuitedforthosematerials
thatdonotfailwithinthestrainlimitsimposedbyTestMethod
ordifferencebetweenfourpointandthreepoint
bendingmodesisthelocationofthemaximumbending
momentandmaximumaxialfipointbending
themaximumaxialfiberstressisuniformlydistributedbe-
epointbendingthemaximum
axialfiberstressislocatedimmediatelyundertheloadingnose.
5.3Flexuralpropertiesmayvarywithspecimendepth,
temperature,atmosphericconditions,andthedifferenceinrate
ofstrainingspecifiedinProceduresAandB.
5.4Beforeproceedingwiththistestmethod,reference
shouldbemadetothespecificationofthematerialbeingtested.
Anytestspecimenpreparation,conditioning,dimensions,or
testingparameterscoveredinthematerialspecification,or
both,shalltakeprecedenceoverthosementionedinthistest
earenomaterialspecifications,thenthese
1inClassificationD4000lists
theASTMmaterialsstandardsthatcurrentlyexist.
tus
6.1TestingMachine—Aproperlycalibratedtestingma-
chinethatcanbeoperatedatconstantratesofcrossheadmotion
overtherangeindicated,andinwhichtheerrorintheload
measuringsystemshallnotexceed61%ofmaximumload
lbeequippedwithadeflection
ffnessofthetestingmachineshallbe
suchthatthetotalelasticdeformationofthesystemdoesnot
exceed1%ofthetotaldeflectionofthetestspecimenduring
testing,d
indicatingmechanismshallbeessentiallyfreefrominertiallag
uracyofthetestingmachine
shallbeverifiedinaccordancewithPracticesE4.
6.2LoadingNosesandSupports—Theloadingnosesand
rtoavoid
excessiveindentation,orfailureduetostressconcentration
directlyundertheloadingnoses,theradiioftheloadingnoses
andsupportsshallbe5.060.1mm(0.19760.004in.)unless
otherwisespecifiedoragreeduponbetweentheinterested
herloadingnosesandsupportsareusedthey
mustcomplywiththefollowingrequirements:theyshallbeat
least3.2mm(
1
⁄
8
in.)forallspecimens,andforspecimens3.2
mm(
1
⁄
8
in.)orgreaterindepth,theradiusofthesupportsmay
allbethislarge
ifsignifi
oftheloadingnosesincontactwiththespecimenshallbe
sufficientlylargetopreventcontactofthespecimenwiththe
sidesofthenoses(seeFig.2).
N
OTE
2—Testdatahaveshownthattheloadingnosesandsupport
dimensionscaninfluencetheflexuralmodulusandflexuralstrength
dingnosesdimensionhasthegreaterinfl-
sionsofloadingnosesandsupportsmustbespecifiedformaterial
specifications.
6.3DeflectionMeasuringDevice—Aproperlycalibrated
devicetomeasurethedeflectionofthebeamatthecommon
centeroftheloadingspan,thatmeetsorexceedsPracticeE83,
ClassC,iceshallautomaticallyand
continuouslyrecordthedeflectionduringthetest.
6.4Micrometers—Suitablemicrometersformeasuringthe
widthandthicknessofthetestspecimentoanincremental
discriminationofatleast0.025mm(0.001in.)shouldbeused.
Allwidthandthicknessmeasurementsofrigidandsemi-rigid
plasticsmaybemeasuredwithahandmicrometerwithratchet.
Asuitableinstrumentformeasuringthethicknessofnon-rigid
testspecimensshallhave:acontactmeasuringpressureof25
62.5kPa(3.660.036psi),amovablecircularcontactfoot
6.3560,025mm(0.25060.001in.)indiameterandafixed
anvil6.3560,025mm(0.25060.001in.)indiameterand
beingparalleltothecontactfootwithin0.005mm(0.0002in.)
ssoffootandanvilshall
conformtotheportionofthecalibrationsectionofTest
MethodD5947.
N
OTE
1—Defaultradii5.0mm;see6.2.
FIG.2LoadingNosesandSupports(ExampleofOneThird
SupportSpan)
2024年4月24日发(作者：诸葛闵)
Designation:D6272–02
StandardTestMethodfor
FlexuralPropertiesofUnreinforcedandReinforcedPlastics
andElectricalInsulatingMaterialsbyFour-PointBending
1
ThisstandardisissuedunderthefixeddesignationD6272;thenumberimmediatelyfollowingthedesignationindicatestheyearof
originaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflastreapproval.A
superscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.
*
1.1Thistestmethodcoversthedeterminationofflexural
propertiesofunreinforcedandreinforcedplastics,including
high-moduluscompositesandelectricalinsulatingmaterialsin
theformofrectangularbarsmoldeddirectlyorcutfromsheets,
plates,estmethodsaregenerally
r,flexural
strengthcannotbedeterminedforthosematerialsthatdonot
breakorthatdonotfailintheouterfistmethod
utilizesafourpointloadingsystemappliedtoasimply
supportedbeam.
1.2Thistestmethodmaybeusedwithtwoprocedures:
1.2.1ProcedureA,designedprincipallyformaterialsthat
breakatcomparativelysmalldeflections.
1.2.2ProcedureB,designedparticularlyforthosematerials
thatundergolargedeflectionsduringtesting.
1.2.3ProcedureAshallbeusedformeasurementofflexural
properties,particularlyflexuralmodulus,unlessthematerial
specifiureBmaybeusedfor
measurementofflexuralstrength.
1.3Comparativetestsmayberunaccordingtoeither
procedure,providedthattheprocedureisfoundsatisfactoryfor
thematerialbeingtested.
1.4ThevaluesstatedinSIunitsaretoberegardedasthe
uesprovidedinparenthesesareforinforma-
tiononly.
1.5Thisstandarddoesnotpurporttoaddressallofthe
safetyconcerns,ifany,e
responsibilityoftheuserofthisstandardtoestablishappro-
priatesafetyandhealthpracticesanddeterminetheapplica-
bilityofregulatorylimitationspriortouse.
N
OTE
1—Thistestmethodisequivalentto,butnotidenticaltoISO
14125(MethodB).
D638TestMethodforTensilePropertiesofPlastics
2
D790TestMethodforFlexuralPropertiesofUnreinforced
andReinforcedPlasticsandElectricalInsulatingMateri-
als
2
D883TerminologyRelatingtoPlastics
2
D4000ClassificationSystemforSpecifyingPlasticMate-
rials
3
D4066ClassificationSystemforNylonInjectionandEx-
trusionMaterials(PA)
3
D5947TestMethodsforPhysicalDimensionsofSolid
PlasticSpecimens
2
E4PracticesforForceVerificationofTestingMachines
4
E83PracticeforVerificationandClassificationofExten-
someters
4
E691PracticeforConductinganInterlaboratoryStudyto
DeterminethePrecisionofaTestMethod
5
2.2ISOStandard:
6
ISO14125(MethodB)
ology
3.1Definitions:
3.1.1Definitionsoftermsapplyingtothesetestmethods
appearinTerminologyD883andAnnexA2ofTestMethod
D638.
yofTestMethod
4.1Abarofrectangularcrosssectionrestsontwosupports
andisloadedattwopoints(bymeansoftwoloadingnoses),
distancebetweentheloadingnoses(theloadspan)iseitherone
thirdoronehalfofthesupportspan(seeFig.1).Asupport
span-to-depthratioof16:1shallbeusedunlessthereisreason
tosuspectthatalargerspan-to-depthratiomayberequired,as
maybethecaseforcertainlaminatedmaterials(seeSection7
andNote8forguidance).
4.2Thespecimenisdeflecteduntilruptureoccursinthe
outerfibersoruntilthemaximumfiberstrain(see12.7)of5%
isreached,whicheveroccursfirst.
AnnualBookofASTMStandards,Vol08.02.
AnnualBookofASTMStandards,Vol03.01.
5
AnnualBookofASTMStandards,Vol14.02.
6
AvailablefromAmericanNationalStandardsInstitute,25W.43rdSt.,4th
Floor,NewYork,NY10036.
4
3
ncedDocuments
2.1ASTMStandards:
D618PracticeforConditioningPlasticsforTesting
2
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
andisthedirectresponsibilityofSubcommitteeD20.10onMechanicalProperties.
CurrenteditionapprovedApril10,ally
publishedasD6272–eviouseditionD6272–00.
2
AnnualBookofASTMStandards,Vol08.01.
1
*ASummaryofChangessectionappearsattheendofthisstandard.
Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.
1
FIG.1LoadingDiagram
ficanceandUse
5.1Flexuralpropertiesdeterminedbythistestmethodare
especiallyusefulforqualitycontrolandspecificationpurposes.
5.2Thistestmethodmaybemoresuitedforthosematerials
thatdonotfailwithinthestrainlimitsimposedbyTestMethod
ordifferencebetweenfourpointandthreepoint
bendingmodesisthelocationofthemaximumbending
momentandmaximumaxialfipointbending
themaximumaxialfiberstressisuniformlydistributedbe-
epointbendingthemaximum
axialfiberstressislocatedimmediatelyundertheloadingnose.
5.3Flexuralpropertiesmayvarywithspecimendepth,
temperature,atmosphericconditions,andthedifferenceinrate
ofstrainingspecifiedinProceduresAandB.
5.4Beforeproceedingwiththistestmethod,reference
shouldbemadetothespecificationofthematerialbeingtested.
Anytestspecimenpreparation,conditioning,dimensions,or
testingparameterscoveredinthematerialspecification,or
both,shalltakeprecedenceoverthosementionedinthistest
earenomaterialspecifications,thenthese
1inClassificationD4000lists
theASTMmaterialsstandardsthatcurrentlyexist.
tus
6.1TestingMachine—Aproperlycalibratedtestingma-
chinethatcanbeoperatedatconstantratesofcrossheadmotion
overtherangeindicated,andinwhichtheerrorintheload
measuringsystemshallnotexceed61%ofmaximumload
lbeequippedwithadeflection
ffnessofthetestingmachineshallbe
suchthatthetotalelasticdeformationofthesystemdoesnot
exceed1%ofthetotaldeflectionofthetestspecimenduring
testing,d
indicatingmechanismshallbeessentiallyfreefrominertiallag
uracyofthetestingmachine
shallbeverifiedinaccordancewithPracticesE4.
6.2LoadingNosesandSupports—Theloadingnosesand
rtoavoid
excessiveindentation,orfailureduetostressconcentration
directlyundertheloadingnoses,theradiioftheloadingnoses
andsupportsshallbe5.060.1mm(0.19760.004in.)unless
otherwisespecifiedoragreeduponbetweentheinterested
herloadingnosesandsupportsareusedthey
mustcomplywiththefollowingrequirements:theyshallbeat
least3.2mm(
1
⁄
8
in.)forallspecimens,andforspecimens3.2
mm(
1
⁄
8
in.)orgreaterindepth,theradiusofthesupportsmay
allbethislarge
ifsignifi
oftheloadingnosesincontactwiththespecimenshallbe
sufficientlylargetopreventcontactofthespecimenwiththe
sidesofthenoses(seeFig.2).
N
OTE
2—Testdatahaveshownthattheloadingnosesandsupport
dimensionscaninfluencetheflexuralmodulusandflexuralstrength
dingnosesdimensionhasthegreaterinfl-
sionsofloadingnosesandsupportsmustbespecifiedformaterial
specifications.
6.3DeflectionMeasuringDevice—Aproperlycalibrated
devicetomeasurethedeflectionofthebeamatthecommon
centeroftheloadingspan,thatmeetsorexceedsPracticeE83,
ClassC,iceshallautomaticallyand
continuouslyrecordthedeflectionduringthetest.
6.4Micrometers—Suitablemicrometersformeasuringthe
widthandthicknessofthetestspecimentoanincremental
discriminationofatleast0.025mm(0.001in.)shouldbeused.
Allwidthandthicknessmeasurementsofrigidandsemi-rigid
plasticsmaybemeasuredwithahandmicrometerwithratchet.
Asuitableinstrumentformeasuringthethicknessofnon-rigid
testspecimensshallhave:acontactmeasuringpressureof25
62.5kPa(3.660.036psi),amovablecircularcontactfoot
6.3560,025mm(0.25060.001in.)indiameterandafixed
anvil6.3560,025mm(0.25060.001in.)indiameterand
beingparalleltothecontactfootwithin0.005mm(0.0002in.)
ssoffootandanvilshall
conformtotheportionofthecalibrationsectionofTest
MethodD5947.
N
OTE
1—Defaultradii5.0mm;see6.2.
FIG.2LoadingNosesandSupports(ExampleofOneThird
SupportSpan)