ASTM C749-15

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C749 − 15 An American National Standard
Standard Test Method for
1
Tensile Stress-Strain of Carbon and Graphite
This standard is issued under the fixed designation C749; 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.
1. Scope* Determine the Precision of a Test Method
1.1 This test method covers the testing of carbon and
3. Terminology
graphite in tension to obtain the tensile stress-strain behavior,
to failure, from which the ultimate strength, the strain to 3.1 Definitions:
3.1.1 The terms as related to tension testing as given in
failure, and the elastic moduli may be calculated as may be
required for engineering applications. Table 2 lists suggested Terminology E6 shall be considered as applying to the terms
used in this test method.
sizes of specimens that can be used in the tests.
3.1.2 modulus of elasticity, n—the ratio of a force applied to
NOTE 1—The results of about 400 tests, on file at ASTM as a research
a material to the increment of dimensional change along the
report, show the ranges of materials that have been tested, the ranges of
force axis, commonly defined as the ratio of tensile stress to
specimen configurations, and the agreement between the testers. See
Section 11. tensile strain.
NOTE 2—For safety considerations, it is recommended that the chains
3.1.3 tensile strength, n—property of solid material that
be surrounded by suitable members so that at failure all parts of the load
indicates its ability to withstand a uniaxial tensile load,
train behave predictably and do not constitute a hazard for the operator.
converted to unit stress based on the original cross-section area
1.2 The values stated in inch-pound units are to be regarded
of the tensile test specimen.
as standard. The values given in parentheses are mathematical
3.1.4 ultimate tensile strength, n—the maximum tensile
conversions to SI units that are provided for information only
stress applied in stretching a specimen to rupture.
and are not considered standard. Conversions are not provided
in the tables and figures.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 Atensile specimen (Fig. 1) is placed within a load train
safety concerns, if any, associated with its use. It is the
assembly made up of precision chains and other machined
responsibility of the user of this standard to establish appro-
parts (Fig. 2).Aload is applied to the specimen provided with
priate safety and health practices and determine the applica-
means of measuring strain until it is caused to fracture. This
bility of regulatory limitations prior to use.
test yields the tensile strength, elastic constants, and strain to
2. Referenced Documents failure of carbons and graphites.
2
2.1 ASTM Standards:
5. Significance and Use
C565 Test Methods for Tension Testing of Carbon and
5.1 The round robin testing on which the precision and bias
Graphite Mechanical Materials
E4 Practices for Force Verification of Testing Machines for this test method have been determined employed a range of
graphites (see Table 2) whose grain sizes were of the order of
E6 Terminology Relating to Methods of Mechanical Testing
1
E177 Practice for Use of the Terms Precision and Bias in 1 mil to ⁄4 in. (0.0254 mm to 6.4 mm) and larger. This wide
range of carbons and graphites can be tested with uniform
ASTM Test Methods
gauge diameters with minimum parasitic stresses to provide
E691 Practice for Conducting an Interlaboratory Study to
quality data for use in engineering applications rather than
simply for quality control. This test method can be easily
1
This test method is under the jurisdiction of ASTM Committee D02 on
adapted to elevated temperature testing of carbons and graphi-
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
tes without changing the specimen size or configuration by
Subcommittee D02.F0 on Manufactured Carbon and Graphite Products.
simply utilizing elevated temperature materials for the load
Current edition approved Oct. 1, 2015. Published November 2015. Originally
train. This test method has been utilized for temperatures as
approved in 1973. Last previous edition approved in 2013 as C749 – 13. DOI:
10.1520/C0749-15.
highas4352 °F(2400 °C).Thedesignofthefixtures(Figs.2-9
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Table 1) and description of the procedures are intended to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
bring about, on the average, parasitic stresses of less than 5 %.
Standards volume information, refer
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