ASTM_D_638M_-_96_scan.pdf

ASTM Db38M 9b m 0759530 0592545 919 m Designation:D 6 3 8 1 1 1 1 -96 AMERICAN SOCIETY FOR TESTING AND MATERIALS 100 Barr Harbor Dr.,West Conshohod(en,PA 19428 An Amefkan Natlonal Standard If not listed in the current combined index,wll appear in the next edii.Reprinted han the Annual Book of A S T M Standards.CopyrQht ASTM Standard Test Method for Tensile Properties of Plastics(Metric)This standard is issued under the fixed designation D 638M:the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(6)indicates an editorial change since the last revision or reapproval.1.Scope 1.I This test method covers the determination of the tensile properties of unreinforced and reinforced plastics in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment,tempera-ture,humidity,and testing machine speed.1.2 This test method can be used for testing materials of any thickness up to 10 mm.However,for testing specimens in the form of thin sheeting,including film less than 1.O mm,Test Methods D 882 is the preferred test method.Materials with a thickness greater than 1 0 mm must be reduced by machining.1.3 This test method includes the option of determining Poissons ratio at room temperature.NOTE 1-This test method and IS0 527-1966 are technically equiv-alent.NOTE 2-This test method is the companion to inch-pound Test Method D 638.NOTE 3-This test method may be used for testing phenolic resin molded or laminated materials.However,where these materials are used as electrical insulation,such materials should be tested in accordance with Test Methods D 229 and Test Method D 65 1.NOTE 4-This test method is not intended to cover precise physical procedures.It is recognized that the constant-rate-of-crosshead-movement type of test leaves much to be desired from a theoretical standpoint,that wide differences may exist between rate of crosshead movement and rate of strain between gage marks on the specimen,and that the testing speeds specified disguise important effects characteristic of materials in the plastic state.Further,it is realized that variations in the thicknesses of test specimens,which are permitted by these proce-dures,produce variations in the surface-volume ratios of such speci-mens,and that these variations may influence the test results.Hence,where directly comparable results are desired,all samples should be of equal thickness.Special additional tests should be used where more precise physical data are needed.NOTE 5-For tensile properties of resin-matrix composites reinforced with oriented continuous or discontinuous high modulus 20 GPa fibers,tests shall be made in accordance with Test Method D 30391 D 3039M.1.4 The values stated in SI units are to be regarded as the standard.The values given in parentheses are for informa-tion only.1.5 This standard does nol purport to address all o f the safety concerns,if any,associated with its use.It is the responsibility ofthe user o f this standard to establish appro-priate safety and health practices and determine the applica-bility o f regulatory limitations prior to use.I This test method is under the jurisdiction of ASTM Committee D-20 on Plastics and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved March 10.1996.Published May 1996.Originally published as D 638M-81.Last previous edition D 638M-93.2.Referenced Documents 2.1 ASTM Standards:D229 Test Methods for Rigid Sheet and Plate Materials D 618 Practice for Conditioning Plastics and Electrical D 638 Test Method for Tensile Properties of Plastics3 D651 Test Method for Tensile Strength of Molded Elec-D 882 Test Methods for Tensile Properties of Thin Plastic D 883 Terminology Relating to Plastics3 D 3039/D 3039M Test Method for Tensile Properties of Polymer Matrix Composite MaterialsS D4000 Classification System for Specifying Plastic Materials6 D4066 Specification for Nylon Injection and Extrusion Materials6 E 4 Practices for Load Verification of Testing Machines E 83 Practice for Verification and Classification of Exten-someters E 132 Test Method for Poissons Ratio at Room Temperature 2.2 IS0 Standard:IS0 527-1966 Determination of Tensile Properties*Used for Electrical Insulation2 Insulating Materials for Testing3 trical Insulating Materials4 Sheeting3 3.Terminology method appear in Terminology D 883 and Annex A1.4.Significance and Use 4.1 This test method is designed to produce tensile property data for the control and specification of plastic materials.These data are also useful for qualitative charac-terization purposes and for research and development.For many materials,there may be a specification that requires the use of this test method,but with some procedural modifications that take precedence when adhering to the specification.Therefore,it is