ASTM E8-04

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ASTM E8-04Standard Test Methods for
Tension Testing of Metallic Materials1
This standard is issued under the fixed designation E 8; 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 (e) 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 These test methods cover the tension testing of metallic
materials in any form at room temperature， specifically， the
methods of determination of yield strength， yield point elon-
gation， tensile strength， elongation， and reduction of area.
NOTE 1-A complete metric companion to Test Methods E 8 has been
developed， therefore， no metric equivalents are shown in these test
methods. Committee E28 was granted an exception in 1997 by the
Committee on Standards to maintain E8 and E8M as separate companion
standards rather than combining standards as recommended by the Form
and Style Manual.
NOTE 2-Gage lengths in these test methods are required to be 4D for
most round specimens. Test specimens made from powder metallurgy
(P/M) materials are exempt from this requirement by industry-wide
agreement to keep the pressing of the material to a specific projected area
and density.
NOTE 3-Exceptions to the provisions of these test methods may need
to be made in individual specifications or test methods for a particular
material. For examples， see Test Methods and Definitions A 370 and Test
Methods B 557.
NOTE 4-Room temperature shall be considered to be 50 to 100°F
unless otherwise specified.
1.2 This standard does not purport to address all of the
safety concerns， if any， associated with its use. It is the
responsibility 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.
2. Referenced Documents
2.1 ASTM Standards:
2
A 356/A 356M Specification for Steel Castings， Carbon，
A 370 Test Methods and Definitions for Mechanical Testin
of Steel Products
B 557 Test Methods of Tension Testing Wrought and Ca
Aluminum- and Magnesium-Alloy Products
E 4 Practices for Force Verification of Testing Machines
E 6 Terminology Relating to Methods of Mechanical Tes
ing
E 8M Test Methods for Tension Testing of Metallic Mate
rials [Metric]
E 29 Practice for Using Significant Digits in Test Data t
Determine Conformance with Specifications
E 83 Practice for Verification and Classification of Exten
someters
E 208 Test Method for Conducting Drop-Weight Test t
Determine Nil-Ductility Transition Temperature of Ferriti
Steels
E 345 Test Methods of Tension Testing of Metallic Foil
E 691 Practice for Conducting an Interlaboratory Study t
Determine the Precision of a Test Method
E 1012 Practice for Verification of Specimen Alignmen
Under Tensile Loading
3. Terminology
3.1 Definitions-The definitions of terms relating to tensio
testing appearing in Terminology E 6 shall be considered a
applying to the terms used in these test methods of tensio
testing. Additional terms being defined are as follows:
3.1.1 discontinuous yielding-in a uniaxial test， a hesitatio
or fluctuation of force observed at the onset of plastic defo
mation， due to localized yielding. (The stress-strain curve nee