ASTM C565-93(1998)

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An American National Standard
Designation:C 565–93 (Reapproved 1998)
Standard Test Methods for
Tension Testing of Carbon and Graphite Mechanical
Materials
This standard is issued under the fixed designation C 565; 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.
1. Scope interest. This test method may be applicable only if the ratio of
specimen diameter to grain size, or flaw size, is greater than 5.
1.1 These test methods, and the figures that are part of the
4.2 These test methods do not substitute for that described
test methods, cover the apparatus, specimen, and procedures
in Test Method C 749, but are useful where less sophisticated
for the tension testing of carbon and graphite mechanical
1 data and less expensive techniques are sufficient.
materials with a grain size smaller than 0.79 mm ( ⁄32 in.).
4.3 Carbon and graphite materials exhibit significant physi-
1.2 This standard does not purport to address all of the
cal property differences within parent materials. Exact sam-
safety concerns, if any, associated with its use. It is the
pling patterns and grain orientations must be specified in order
responsibility of the user of this standard to establish appro-
to make meaningful tensile strength comparisons.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
2. Referenced Documents 5.1 Testing Machine—The machine used for tension testing
shall conform to the requirements of Practices E 4. The testing
2.1 ASTM Standards:
machine shall have a capacity that the breaking load of the test
C 709 Terminology Relating to Manufactured Carbon and
specimen falls between 10 and 90 % of the scale capacity.
Graphite
5.2 Gripping Devices— Gripping devices that conform to
C 749 Test Method for Tensile Stress-Strain of Carbon and
those illustrated in Fig. 1 shall be used. These gripping devices
Graphite
shall be attached to the heads of the testing machine through
E 4 Practices for Force Verification of Testing Machines
chain connectors. Fig. 2 shows the gripping device connected
E 6 Terminology Relating to Methods of Mechanical Test-
to the heads. Extreme care shall be taken that the axis of the
ing
test specimen is located on the center line of the head of the
3. Terminology testing machine.
3.1 Definitions: For definitions of terms relating to manu-
6. Test Specimens
factured carbon and graphite, see Terminology C 709. The
6.1 Test specimens shall be produced to the configuration
definitions of terms relating to tension testing in Definitions
shown in Fig. 3.
E 6 shall be considered as applying to the terms used in these
6.2 Improperly prepared test specimens often cause unsat-
test methods.
isfactory test results. It is important, therefore, that care be
4. Significance and Use exercised in the preparation of specimens, particularly in the
machining and polishing.
4.1 These test methods may be used for quality control
6.3 The specimen shall be hand polished with No. 000 dry
testing of established grades of carbon and graphite materials,
paper until no circular grooves are visible to the naked eye.
in the development of new grades, and for other purposes
6.4 Theacceptablefracturezoneofthespecimenshallbe19
where relative strength levels are the primary quantities of
mm ( ⁄4 in.) long with the center of the zone at the point of
minimum diameter. Marks indicating fracture zone limits may
These test methods are under the jurisdiction of ASTM Committee D02 on
be applied with ink or layout dope, but no scratching, punch-
Petroleum Products and Lubricants and are the direct responsibility of Subcommit-
ing, or notching of the specimen is permissible.
tee D02.F on Manufactured Carbon and Graphite Products.
6.5 To determine the cross-sectional area, the diameter of
Current edition approved Jan. 15, 1993. Published March 1993. Originally
the specimen at the narrowest point shall be used. The
published as C 565 – 65 T. Last previous edition C 565 – 91.
Annual Book of ASTM Standards, Vol 05.05.
dimension shall be recorded to the nearest 0.02 mm (0.001 in.).
Annual Book of ASTM Standards, Vol 03.01.
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C 565
FIG. 2 Test Setup
NOTE 1—All dimensions are in inches.
NOTE 2—Material is stainless steel.
NOTE 3—Surface finish of working surfaces, 11 microinches AA or
bette
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