1、Designation: D5083 101Standard Test Method forTensile Properties of Reinforced Thermosetting PlasticsUsing Straight-Sided Specimens1This standard is issued under the fixed designation D5083; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, 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.1NOTEEditorially corrected Fig. 1 in February 2015.1. Scope*1.1 This test method covers the determination of t
3、he tensileproperties of thermosetting reinforced plastics using test speci-mens of uniform nominal width when tested under definedconditions of pretreatment, temperature, humidity, and testing-machine speed.NOTE 1Experience with this test method to date has been limited toglass-reinforced thermosets
4、.Applicability to other materials remains to bedetermined.1.2 This test method can be used for testing materials of anythickness up to 14 mm (0.55 in.).NOTE 2This test method is not intended to cover precise physicalprocedures. It is recognized that the constant-rate-of-crosshead-movementtype of tes
5、t leaves much to be desired from a theoretical standpoint, thatwide differences may exist between rate-of-crosshead movement and rateof strain between gage marks on the specimen, and that the testing speedsspecified disguise important effects characteristic of materials in theplastic state. Further,
6、 it is realized that variations in the thicknesses of testspecimens that are permitted by these procedures, produce variations inthe surface-volume ratios of such specimens, and that these variations mayinfluence the test results. Hence, where directly comparable results aredesired, all samples shou
7、ld be of equal thickness. Special additional testsshould be used where more precise physical data are needed.NOTE 3Use of this test method for testing materials of thicknessesgreater than 14 mm (0.55 in.) is not recommended. Reducing the thicknessby machining may be acceptable for materials of unifo
8、rm reinforcementamount and direction, but is generally not recommended.1.3 Test data obtained by this test method is relevant andappropriate for use in engineering design.1.4 The values stated in SI units are to be regarded asstandard. The inch-pound units given in parentheses are forinformation onl
9、y.1.5 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 limitations prior to use.NOTE 4This te
10、st method is technically equivalent to ISO 527-4 exceptas noted below:(a) This test method does not include testing of the Type I dogbone shapedspecimen described in ISO 527-4. Testing of this type of specimen,primarily used for reinforced and un-reinforced thermoplastic materials, isdescribed in Te
11、st Method D638.(b) The thickness of test specimens in this test method includes the 2 mmto 10 mm thickness range of ISO 527-4, but expands the allowable testthickness to 14 mm.NOTE 5For tensile properties of resin-matrix composites reinforcedwith oriented continuous or discontinuous high modulus 20-
12、Gpa ( 3.0106-psi) fibers, tests shall be made in accordance with Test MethodD3039/D3039M or ISO 527 Part 5.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD883 Terminology Relating to PlasticsD3039/D3039
13、M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD4000 Classification System for Specifying Plastic Materi-alsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensE4 Practices for Force Verification of Testing MachinesE83 Practice for Verification and Classi
14、fication of Exten-someter SystemsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:3ISO 527 PlasticsDetermination of Tensile PropertiesPart 1: General Principles1This test method is under the jurisdiction ofASTM Committee D20 on Plastics
15、and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved April 1, 2010. Published April 2010. Originallyapproved in 1990. Last previous edition approved in 2008 as D5083 08. DOI:10.1520/D5083-10E01.2For referenced ASTM standards, visit the ASTM websit
16、e, 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.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/
17、www.ansi.org.*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 States1ISO 527 Part 4 PlasticsDetermination of TensilePropertiesTest Conditions for Isotropic and OrthotropicFiber-
18、Reinforced Plastic CompositesISO 527 PlasticsDetermination of Tensile PropertiesPart 5: Test Conditions for Unidirectional Fiber-Reinforced Plastic CompositesISO 1268 Fibre-Reinforced PlasticsMethods of ProducingTest Plates3. Terminology3.1 DefinitionsDefinitions of terms applying to this testmethod
19、 appear in Terminology D883.4. Significance and Use4.1 This test method is intended for tensile testing offiber-reinforced thermosetting laminates. For injection moldedthermoplastics, both reinforced and unreinforced, Test Meth-ods D638 is recommended. For most unidirectional fiberreinforced laminat
20、es, Test Methods D3039/D3039M is pre-ferred.4.2 This test method is designed to produce tensile propertydata for quality control and research and development. Factorsthat influence the tensile properties, and should therefore bereported, are: material, methods of material and specimenpreparation, sp
21、ecimen conditioning, test environment, speed oftesting, void content, and volume percent reinforcement.4.3 It is realized that a material cannot be tested without alsospecifying the method of preparation of that material. Hence,when comparative tests of materials per se are desired, thegreatest care
22、 must be exercised to ensure that all samples areprepared in exactly the same way, unless the test is to includethe effects of sample preparation. Similarly, for referee pur-poses or comparisons within any given series of specimen, careFIG. 1 Standard and End Tabbed Specimen DimensionsD5083 1012must
23、 be taken to secure the maximum degree of uniformity indetails of preparation, treatment, and handling.NOTE 6Preparation techniques for reinforced thermosetting plasticscan be found in the part of ISO 1268 appropriate to the manufacturingtechnique for the laminate.4.4 Tensile properties may provide
24、useful data for engineer-ing design purposes. However, because of the high degree ofsensitivity exhibited by many reinforced plastics to rate ofstraining and environmental conditions, data obtained by thistest method cannot be considered valid for applications involv-ing load-time scales or environm
25、ents widely different fromthose of this test method. In cases of such dissimilarity, noreliable estimation of the limit of usefulness can be made formost plastics. This sensitivity to rate of straining and environ-ment necessitates testing over a broad load-time scale (includ-ing impact and creep) a
26、nd range of environmental conditions.NOTE 7Since the existence of a true elastic limit in plastics (as inmany other organic materials and in many metals) is debatable, thepropriety of applying the term “elastic modulus” in its quoted generallyaccepted definition to describe the “stiffness” or stress
27、-strain characteris-tics of plastic materials is highly dependent on such factors as rate ofapplication of stress, temperature, previous history of specimen, etc.However, stress-strain curves for plastics, determined as described in thistest method, almost always show a linear region at low stresses
28、.Astraightline drawn tangent to this portion of the curve permits calculation of anelastic modulus of the usually defined type. Such a constant is useful if itsarbitrary nature and dependence on time, temperature, and similar factorsare realized.4.5 For many materials, there may be a specification t
29、hatrequires the use of this test method, but with some proceduralmodifications that take precedence when adhering to thespecification. Therefore, it is advisable to refer to that materialspecification before using this test method. Table 1 of Classi-fication D4000 lists the ASTM materials standards
30、that cur-rently exist.5. Apparatus5.1 Testing MachineA testing machine of the constant-rate-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
31、Grip:5.1.3.1 Grips for holding the test specimen between thefixed member and the movable member. The grips shall beself-aligning, that is, they shall be attached to the fixed andmovable member, respectively, in such a manner that they willmove freely into alignment as soon as any load is applied, so
32、that the long axis of the test specimen will coincide with thedirection of the applied load through the center line of the gripassembly. Align the specimen as perfectly as possible with thedirection of pull so that no rotary motion that may induceslippage will occur in the grips; there is a limit to
33、 the amountof misalignment self-aligning grips will accommodate.5.1.3.2 Mount the test specimen in such a way that slippagerelative to the grips is prevented insofar as possible. Gripsurfaces that are deeply scored or serrated with a patternsimilar to those of a coarse single-cut file, serrations ab
34、out 0.09in. (2.4 mm) apart and about 0.06 in. (1.6 mm) deep or finer,have been found satisfactory for most thermosetting materials.The serrations should be kept clean and sharp. Breaking in thegrips may occur at times, even when deep serrations or abradedspecimen surfaces are used; other techniques
35、must be used inthese cases. Other techniques that have been found useful,particularly with smooth-faced grips, are abrading that portionof the surface of the specimen that will be in the grips, andinterposing thin pieces of abrasive cloth, abrasive paper, orplastic or rubber-coated fabric, commonly
36、called hospitalsheeting, between the specimen and the grip surface. Number80 double-sided abrasive paper has been found effective inmany cases. An open-mesh fabric, in which the threads arecoated with abrasive, has also been effective.The use of specialtypes of grips is sometimes necessary to elimin
37、ate slippage andbreakage in the grips.5.1.4 Drive MechanismA drive mechanism for impartingto the movable member a controlled velocity with respect tothe stationary member, this velocity to be regulated as specifiedin Section 8.5.1.5 Load IndicatorA suitable load-indicating mecha-nism capable of show
38、ing the total tensile load carried by thetest specimen when held by the grips. This mechanism shall beessentially free of inertia lag at the specified rate of testing andshall indicate the load with an accuracy of 61 % of theindicated value, or better. The accuracy of the testing machineshall be ver
39、ified in accordance with Practices E4.NOTE 8Experience has shown that many testing machines now in useare incapable of maintaining accuracy for as long as the periods betweeninspection recommended in Practices E4. Hence, it is recommended thateach machine be studied individually and verified as ofte
40、n as may befound necessary. It may be necessary to perform this function daily.5.1.6 The fixed member, movable member, drivemechanism, and grips shall be constructed of such materialsand in such proportions that the total elastic longitudinal strainof the system constituted by these parts does not e
41、xceed 1 % ofthe total longitudinal strain between the two gage marks on thetest specimen at any time during the test and at any load up tothe rated capacity of the machine.5.2 StrainStrain may be determined by means of anextension indicator or strain indicator. If Poissons ratio is to bedetermined,
42、the specimen must be instrumented to measurestrain in both longitudinal and lateral directions.5.2.1 Extension Indicator (Extensometer)A suitable in-strument for determining the distance between two designatedfixed points within the gage length of the test specimen as thespecimen is stretched. It is
43、 desirable, but not essential, that thisinstrument automatically record the distance, or any change init, or of the elapsed time from the start of the test, or both. Ifonly the latter is obtained, load-time data must also be taken.This instrument shall be essentially free of inertia at thespecified
44、speed of testing. Extensometers shall be classifiedand calibration periodically verified in accordance with Prac-tice E83.5.2.2 Modulus MeasurementsFor modulus measurement,an extensometer with a maximum strain error of 0.0002mm/mm or 0.0002 in./in. that automatically and continuouslyD5083 1013record
45、s strain shall be used. A Class B-2 extensometer (seePractice E83) meets this requirement.5.2.3 Low-Extension MeasurementsFor low-extensionmeasurements beyond the modulus range but below 20 %extension, the extensometer system must meet, at least, Prac-tice E83 Class C requirements.This requires a fi
46、xed strain errorof .0025 mm (.001 in.) or less, or the capability of reading to61 % of the indicated strain, whichever is greater.5.2.4 High-Extension MeasurementsFor measurementsgreater than 20 %, and beyond the yield point of the material,strain-measuring techniques with error no greater than 610
47、%of the measured value are acceptable.5.2.5 When desired, the specimen may be instrumented withstrain gages. Proper preparation of the specimen surface andgage as well as mounting of the gage to the specimen surface,is mandatory to ensure reliable and accurate strain measure-ments.NOTE 9Bonded strai
48、n gages can accurately measure strain directlybelow the gage. Reinforced or discontinuous laminates may producelocalized strain fields directly under the gage that are not identified bystandard averaging extensometers. For strain gages whose lengths are tooshort, localized strain fields under the ga
49、ge may cause misleading results.5.3 Micrometers:5.3.1 Suitable micrometers for measuring the width andthickness of the test specimen to an incremental discriminationof at least 0.025 mm (0.001 in.) should be used. All width andthickness measurements of rigid and semirigid plastics may bemeasured with a hand micrometer with ratchet. A suitableinstrument for measuring the thickness of non-rigid test speci-mens shall have: a contact measuring pressure of 25 6 2.5 kPa(3.6 6 0.36 psi); a movable circular contact foot 6.35 6 0.025mm (0.250 6 0.001 in.)
