ASTM E8M-01e2

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Designation: E 8M – 01
METRIC
Standard Test Methods for
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Tension Testing of Metallic Materials [Metric]
This standard is issued under the fixed designation E8M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
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ε NOTE—Sections 3.1.5, 7.2.2, 7.9.2, 7.9.3.2 and the caption of Fig. 27 were editorially revised in April 2002.
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ε NOTE—The terms Discontinuous Yielding,Lower Yield Strength, Upper Yield Strength,and Yield Point Elongation were
editorially revised in October 2002.
1. Scope * A356/A356M Specification for Steel Castings, Carbon,
Low Alloy, and Stainless Steel, Heavy-Walled for Steam
1.1 These test methods cover the tension testing of metallic
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Turbines
materials in any form at room temperature, specifically, the
A370 TestMethodsandDefinitionsforMechanicalTesting
methods of determination of yield strength, yield point elon-
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of Steel Products
gation, tensile strength, elongation, and reduction of area.
B557M TestMethodsofTensionTestingWroughtandCast
NOTE 1—ThesetestmethodsarethemetriccompanionofTestMethods 4
Aluminum- and Magnesium-Alloy Products [Metric]
E8. Committee E28 was granted an exception in 1997 by the Committee
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E4 Practices for Force Verification of Testing Machines
on Standards to maintain E8 and E8M as separate companion standards
E6 Terminology Relating to Methods of Mechanical Test-
rather than combining standards as recommended by the Form and Style
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ing
manual.
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NOTE 2—Thesemetrictestmethodsareessentiallythesameasthosein E8 TestMethodsforTensionTestingofMetallicMaterials
TestMethodsE8,andarecompatibleintechnicalcontentexceptthatgage
E29 Practice for Using Significant Digits in Test Data to
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lengths are required to be 5D for most round specimens rather than 4D as
Determine Conformance with Specifications
specified in Test Methods E8. Test specimens made from powder
E83 Practice for Verification and Classification of Exten-
metallurgy(P/M)materialsareexemptfromthisrequirementbyindustry-
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someters
wideagreementtokeepthepressingofthematerialtoaspecificprojected
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E 345 Test Methods of Tension Testing of Metallic Foil
area and density.
E691 Practice for Conducting an Interlaboratory Study to
NOTE 3—Exceptions to the provisions of these test methods may need
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to be made in individual specifications or test methods for a particular Determine the Precision of a Test Method
material. For examples, see Test Methods and DefinitionsA370 and Test
E1012 Practice for Verification of Specimen Alignment
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Methods B557M.
Under Tensile Loading
NOTE 4—Roomtemperatureshallbeconsideredtobe10to38°Cunless
otherwise specified.
3. Terminology
1.2 This standard does not purport to address all of the
3.1 Definitions—The definitions of terms relating to tension
safety concerns, if any, associated with its use. It is the
testing appearing in Terminology E6 shall be considered as
responsibility of the user of this standard to establish appro-
applying to the terms used in these test methods of tension
priate safety and health practices and determine the applica-
testing. Additional terms being defined are as follows:
bility of regulatory limitations prior to use.
3.1.1 discontinuous yielding—in a uniaxial test, a hesitation
or fluctuation of force observed at the onset of plastic defor-
2. Referenced Documents
mation, due to localized yielding. (The stress-strain curve need
2.1 ASTM Standards:
not appear to be discontinuous.)
1 2
These test methods are under the jurisdiction of ASTM Committee E28 on Annual Book of ASTM Standards, Vol 01.02.
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Mechanical Testing and are the direct responsibility of Subcommittee E28.04 on Annual Book of ASTM Standards, Vol 01.03.
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Uniaxial Testing. Annual Book of ASTM Standards, Vol 02.02.
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Current edition approved Oct. 10, 2001. Published December 2001. Originally Annual Book of ASTM Standards, Vol 03.01.
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published as E8M–84. Last previous edition E8M–00b. Annual Book of ASTM Standards, Vol 14.02.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E8M–01
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NOTE 6—Alignment methods are given in Practice E1012.
3.1.2 lower yield strength, LYS [FL ]—in a uniaxial test,
the minimum stress recorded during discontinuous yielding,
5.2.2 Wedge Grips—Testing machines usually are equipped
ignoring transient effects.
with wedge grips. These wedge grips generally furnish a
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3.1.3 upper yield strength, UYS [FL ]—in
...