ASTM D882-2010 Standard Test Method for Tensile Properties of Thin Plastic Sheeting《薄塑料板的抗拉特性的标准试验方法》.pdf

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1、Designation: D882 10Standard Test Method forTensile Properties of Thin Plastic Sheeting1This standard is issued under the fixed designation D882; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i

2、n parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.These test methods have been approved for use by agencies of the Department of Defense to replace Method 1013 of Federal TestMethod Standard 406.1. Scope*1

3、.1 This test method covers the determination of tensileproperties of plastics in the form of thin sheeting and films (lessthan 1.0 mm (0.04 in.) in thickness).NOTE 1Film is defined in Terminology D883 as an optional term forsheeting having a nominal thickness no greater than 0.25 mm (0.010 in.).NOTE

4、 2Tensile properties of plastics 1.0 mm (0.04 in.) or greater inthickness shall be determined according to Test Method D638.1.2 This test method can be used to test all plastics withinthe thickness range described and the capacity of the machineemployed.1.3 Specimen extension can be measured by grip

5、 separation,extension indicators, or displacement of gage marks.1.4 The procedure for determining the tensile modulus ofelasticity is included at one strain rate.NOTE 3The modulus determination is generally based on the use ofgrip separation as a measure of extension; however, the desirability ofusi

6、ng extensometers, as described in 5.2, is recognized and provision forthe use of such instrumentation is incorporated in the procedure.1.5 Test data obtained by this test method is relevant andappropriate for use in engineering design.1.6 The values stated in SI units are to be regarded as thestanda

7、rd. The values in parentheses are provided for informa-tion only.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 appl

8、ica-bility of regulatory limitations prior to use.NOTE 4This test method is similar to ISO 527-3, but is not consideredtechnically equivalent. ISO 527-3 allows for additional specimen configu-rations, specifies different test speeds, and requires an extensometer orgage marks on the specimen.2. Refer

9、enced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD883 Terminology Relating to PlasticsD4000 Classification System for Specifying Plastic Materi-alsD5947 Test Methods for Physical Dimensions of SolidPlastics Speci

10、mensD6287 Practice for Cutting Film and Sheeting Test Speci-mensD6988 Guide for Determination of Thickness of PlasticFilm Test SpecimensE4 Practices for Force Verification of Testing MachinesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Stand

11、ard:ISO 527-3 PlasticsDetermination of Tensile PropertiesPart 3: Test Conditions for Films and Sheets33. Terminology3.1 DefinitionsDefinitions of terms and symbols relatingto tension testing of plastics appear in the Annex to TestMethod D638.3.1.1 line gripsgrips having faces designed to concentrate

12、the entire gripping force along a single line perpendicular to thedirection of testing stress. This is usually done by combiningone standard flat face and an opposing face from whichprotrudes a half-round.3.1.2 flat gripsgrips having flat faces and lined with thinrubber, crocus-cloth, emery cloth, o

13、r pressure-sensitive tape.3.1.3 tear failurea tensile failure characterized by fractureinitiating at one edge of the specimen and progressing across1These test methods are under the jurisdiction of ASTM Committee D20 onPlastics and are the direct responsibility of Subcommittee D20.19 on Molded andEx

14、truded Products.Current edition approved April 1, 2010. Published June 2010. Originallyapproved in 1946. Last previous edition approved in 2009 as D882 - 09. DOI:10.1520/D0882-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org.

15、 For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.1*A Summary of Changes section appears at the end of th

16、is standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.the specimen at a rate slow enough to produce an anomalousload-deformation curve.4. Significance and Use4.1 Tensile properties determined by this test method are ofvalue for

17、the identification and characterization of materials forcontrol and specification purposes. Tensile properties can varywith specimen thickness, method of preparation, speed oftesting, type of grips used, and manner of measuring extension.Consequently, where precise comparative results are desired,th

18、ese factors must be carefully controlled. This test methodshall be used for referee purposes, unless otherwise indicatedin particular material specifications. For many materials, therecan be a specification that requires the use of this test method,but with some procedural modifications that take pr

19、ecedencewhen adhering to the specification. Therefore, it is advisable torefer to that material specification before using this testmethod. Table 1 in Classification D4000 lists the ASTMmaterials standards that currently exist.4.2 Tensile properties can be utilized to provide data forresearch and de

20、velopment and engineering design as well asquality control and specification. However, data from suchtests cannot be considered significant for applications differingwidely from the load-time scale of the test employed.4.3 The tensile modulus of elasticity is an index of thestiffness of thin plastic

21、 sheeting. The reproducibility of testresults is good when precise control is maintained over all testconditions. When different materials are being compared forstiffness, specimens of identical dimensions must be employed.4.4 The tensile energy to break (TEB) is the total energyabsorbed per unit vo

22、lume of the specimen up to the point ofrupture. In some texts this property has been referred to astoughness. It is used to evaluate materials that are subjected toheavy abuse or that can stall web transport equipment in theevent of a machine malfunction in end-use applications.However, the rate of

23、strain, specimen parameters, and espe-cially flaws can cause large variations in the results. In thatsense, caution is advised in utilizing TEB test results forend-use design applications.4.5 Materials that fail by tearing give anomalous data whichcannot be compared with those from normal failure.5.

24、 Apparatus5.1 Testing MachineA testing machine of the constantrate-of-crosshead-movement type and comprising essentiallythe following:5.1.1 Fixed MemberA fixed or essentially stationarymember carrying one grip.5.1.2 Movable MemberA movable member carrying asecond grip.5.1.3 GripsA set of grips for h

25、olding the test specimenbetween the fixed member and the movable member of thetesting machine; grips can be either the fixed or self-aligningtype. In either case, the gripping system must minimize bothslippage and uneven stress distribution.5.1.3.1 Fixed grips are rigidly attached to the fixed andmo

26、vable members of the testing machine. When this type ofgrip is used, care must be taken to ensure that the test specimenis inserted and clamped so that the long axis of the testspecimen coincides with the direction of pull through thecenter line of the grip assembly.5.1.3.2 Self-aligning grips are a

27、ttached to the fixed andmovable members of the testing machine in such a manner thatthey will move freely into alignment as soon as a load isapplied so that the long axis of the test specimen will coincidewith the direction of the applied pull through the center line ofthe grip assembly. The specime

28、ns must be aligned as perfectlyas possible with the direction of pull so that no rotary motionwill cause slippage to occur in the grips; there is a limit to theamount of misalignment self-aligning grips will accommodate.5.1.3.3 The test specimen shall be held in such a way thatslippage relative to t

29、he grips is prevented insofar as possible.Grips lined with thin rubber, crocus-cloth, emery cloth, orpressure-sensitive tape as well as file-faced or serrated gripshave been successfully used for many materials. The choice ofgrip surface will depend on the material tested, thickness, etc.Line grips

30、padded on the round face with 0.75-1.00 mm(0.030-0.040 in.) blotting paper or filter paper have been foundsuperior. Air-actuated grips have been found advantageous,particularly in the case of materials that tend to “neck” into thegrips, since pressure is maintained at all times (see Notes 5-7).In ca

31、ses where samples frequently fail at the edge of the grips,it could be advantageous to slightly increase the radius ofcurvature of the edges where the grips come in contact with thetest area of the specimen.NOTE 5Caution needs to be taken when choosing the type of gripsand the type of grip surfaces

32、to use for testing specimens films composedof high strength LLDPE and VLDPE resins. Test results tend to differmore when comparing these types of specimens films tested with the gripslined with different materials.NOTE 6The gage of pressure sensitive tape, thin rubber, crocus-cloth,and emery cloth n

33、eeds to be adequate enough to prevent slipping andpremature failures of the test specimens (for example, pressure sensitivetape is used on the surface of the grips: the test specimen can may beginto tear at the edge of the grips during the test if the tape is too thin.).NOTE 7The grit size of crocus

34、-cloth and emery cloth is suggested tobe at least 800. The use of these materials helps to prevent test specimensfrom slipping in the grips. One must be cautious when using thesematerials so that premature failures of the test specimens do not occur.5.1.4 Drive MechanismA drive mechanism for imparti

35、ngto the movable member a uniform, controlled velocity withrespect to the stationary member. The velocity shall be regu-lated as specified in Section 9.5.1.5 Load IndicatorA suitable load-indicating mecha-nism capable of showing the total tensile load carried by thetest specimen held by the grips. T

36、his mechanism shall beessentially free of inertial lag at the specified rate of testing (seeNote 8). Unless a suitable extensometer is used (see 5.2), themotion of the weighing system shall not exceed 2 % of thespecimen extension within the range being measured. The loadindicator shall determine the

37、 tensile load applied to thespecimen with an accuracy of 61 % of the indicated value, orbetter. The accuracy of the testing machine shall be verified inaccordance with Practices E4.5.1.6 Crosshead Extension IndicatorAsuitable extension-indicating mechanism capable of showing the amount ofchange in t

38、he separation of the grips, that is, crossheadmovement. This mechanism shall be essentially free of inertialD882 102lag at the specified rate of testing (see Note 8) and shallindicate the crosshead movement with an accuracy of 61%ofthe indicated value, or better.5.2 Extensometer (Optional)A suitable

39、 instrument usedfor determining the distance between two designated points onthe test specimen as the specimen is stretched. The use of thistype of instrument is optional and is not required in this testmethod. This apparatus, if employed, shall be so designed as tominimize stress on the specimen at

40、 the contact points of thespecimen and the instrument (see 8.3). It is desirable that thisinstrument automatically record the distance, or any change init, as a function of the load on the test specimen or of theelapsed time from the start of the test, or both. If only the latteris obtained, load-ti

41、me data must also be taken. This instrumentmust be essentially free of inertial lag at the specified speed oftesting (see Note 8).5.2.1 Modulus of Elasticity and Low-ExtensionMeasurementsExtensometers used for modulus of elasticityand low-extension (less than 20 % elongation) measurementsshall, at a

42、 minimum, be accurate to 61 % and comply with therequirements set forth in Practice E83 for a Class C instrument.5.2.2 High-Extension MeasurementsInstrumentation andmeasuring techniques used for high-extension (20 % elonga-tion or greater) measurements shall be accurate to 610 % ofthe indicated valu

43、e, or better.NOTE 8A sufficiently high response speed in the indicating andrecording system for the load and extension data is essential. The responsespeed required of the system will depend in part on the material tested(high or low elongation) and the rate of straining.5.3 Thickness GaugeA dead-we

44、ight dial or digital mi-crometer as described in Test Methods D5947 or D6988 asappropriate for the material or specimen geometry being tested.5.4 Width-Measuring DevicesSuitable test scales or otherwidth measuring devices capable of measuring 0.25 mm (0.010in.) or less.5.5 Specimen CutterRefer to Pr

45、actice D6287 for theapparatus and techniques for cutting film and sheeting used inthis test method.5.5.1 Devices that use razor blades have proven especiallysuitable for materials having an elongation-at-fracture above10 to 20 %.5.5.2 The use of a punch press or a striking die is notrecommended beca

46、use of their tendency to produce poor andinconsistent specimen edges.5.5.3 The use of a cutting template and a single razor bladeis not recommended as it will affect the parallelism of the testspecimen.6. Test Specimens6.1 The test specimens shall consist of strips of uniformwidth and thickness at l

47、east 50 mm (2 in.) longer than the gripseparation used.6.2 The nominal width of the specimens shall be not lessthan 5.0 mm (0.20 in.) or greater than 25.4 mm (1.0 in.).6.3 A width-thickness ratio of at least eight shall be used.Narrow specimens magnify effects of edge strains or flaws, orboth.6.4 Th

48、e utmost care shall be exercised in cutting specimensto prevent nicks and tears that cause premature failures (seeNote 9). The edges shall be parallel to within 5 % of the widthover the length of the specimen between the grips.NOTE 9Microscopical examination of specimens can be used todetect flaws d

49、ue to sample or specimen preparation.6.5 Test specimens shall be selected so that thickness isuniform to within 10 % of the thickness over the length of thespecimen between the grips in the case of specimens 0.25 mm(0.010 in.) or less in thickness and to within 5 % in the case ofspecimens greater than 0.25 mm (0.010 in.) in thickness butless than 1.00 mm (0.040 in.) in thickness.NOTE 10In cases where thickness variations are in excess of thoserecommended in 6.5, results tend not to be characteristic of the materialunder test.6.6 If the material is suspect