TensileTest_plastics - Designation: D638 10 Standard Test...

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Designation: D638 – 10 Standard Test Method for Tensile Properties of Plastics 1 This standard is issued under the fxed designation D638; 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 ( ´ ) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope* 1.1 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 defned conditions oF pretreatment, temperature, humidity, and testing machine speed. 1.2 This test method can be used For testing materials oF any thickness up to 14 mm (0.55 in.). However, For testing specimens in the Form oF thin sheeting, including flm less than 1.0 mm (0.04 in.) in thickness, Test Methods D882 is the preFerred test method. Materials with a thickness greater than 14 mm (0.55 in.) must be reduced by machining. 1.3 This test method includes the option oF determining Poisson’s ratio at room temperature. N OTE 1—This test method and ISO 527-1 are technically equivalent. N OTE 2—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 specifed disguise important eFFects characteristic oF materials in the plastic state. ±urther, it is realized that variations in the thicknesses oF test specimens, which are permitted by these procedures, produce variations in the surFace-volume ratios oF such specimens, and that these variations may in²uence 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. N OTE 3—This test method may be used For testing phenolic molded resin or laminated materials. However, where these materials are used as electrical insulation, such materials should be tested in accordance with Test Methods D229 and Test Method D651 . N OTE 4—±or tensile properties oF resin-matrix composites reinForced with oriented continuous or discontinuous high modulus >20-GPa [>3.0 3 10 6 -psi) fbers, tests shall be made in accordance with Test Method D3039/D3039M . 1.4 Test data obtained by this test method are relevant and appropriate For use in engineering design. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are For inFormation only.
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This note was uploaded on 12/05/2011 for the course MSE 4020 at Cornell.

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TensileTest_plastics - Designation: D638 10 Standard Test...

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