ASTM B279-04
(Test Method)Standard Test Method for Stiffness of Bare Soft Square and Rectangular Copper and Aluminum Wire for Magnet Wire Fabrication (Withdrawn 2004)
Standard Test Method for Stiffness of Bare Soft Square and Rectangular Copper and Aluminum Wire for Magnet Wire Fabrication (Withdrawn 2004)
SIGNIFICANCE AND USE
This test method is designed as an inspection or acceptance test of new bare soft square and rectangular wire intended for subsequent fabrication into magnet wire.
Note 1—Since the applied unit stress and the time of application are constant for all wire sizes, the test enables comparisons of stiffness to be made between wires of the same or different size on the basis of the permanent elongation resulting from the application of a low unit stress.
SCOPE
1.1 This test method, known as the low-stress elongation (LSE) test, covers the procedure for determining the stiffness of bare soft square and rectangular copper and aluminum wire in terms of the permanent elongation resulting from the application of a tensile stress.
1.2 The SI values for the mass of the specimen are regarded as the standard. For all other properties, the inch-pound values are to be regarded as standard and the SI units may be approximate.
WITHDRAWN RATIONALE
This test method, known as the low-stress elongation (LSE) test, covers the procedure for determining the stiffness of bare soft square and rectangular copper and aluminum wire in terms of the permanent elongation resulting from the application of a tensile stress.
Formerly under the jurisdiction of Committee B01 on Electrical Conductors and Subcommittee B01.02 on Methods of Test and Sampling Procedure, this test method was withdrawn without replacement in January 2013. This standard is being withdrawn without replacement due to its limited use by industry.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: B279 − 04
StandardTest Method for
Stiffness of Bare Soft Square and Rectangular Copper and
1
Aluminum Wire for Magnet Wire Fabrication
This standard is issued under the fixed designation B279; 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 retaining the original curvature of the package to the greatest
extent possible. Test specimens having the full cross-sectional
1.1 This test method, known as the low-stress elongation
area of the wire shall be used. The standard gage length for the
(LSE) test, covers the procedure for determining the stiffness
measurement of elongation of wire shall be 10 in. (254 mm).
of bare soft square and rectangular copper and aluminum wire
The total length of the specimens shall be at least equal to the
in terms of the permanent elongation resulting from the
gage length plus the length of wire required for the full use of
application of a tensile stress.
the grips employed.
1.2 The SI values for the mass of the specimen are regarded
as the standard. For all other properties, the inch-pound values
6. Procedure
are to be regarded as standard and the SI units may be
approximate. 6.1 Straighten the test specimens carefully by hand with a
minimum amount of distortion or cold work. Improperly
2. Referenced Document
prepared test specimens often cause unsatisfactory test results.
2.1 Thefollowingdocumentformsapartofthistestmethod
6.2 Cut off a test specimen of sufficient length as described
to the extent referenced herein:
in 5.1. Measure the length to the nearest 0.01 in. (0.25 mm)
2
2.2 ASTM Standards:
with any measuring device accurate to 0.1 % (Note 2). Mea-
E4 Practices for Force Verification of Testing Machines
sure the mass of this specimen to the nearest 0.01 g on a
balance accurate to 0.1 %. The load required to apply a stress
3. Significance and Use
to the specimen equal to 15 000 psi (103 MPa) for copper, and
3.1 This test method is designed as an inspection or accep-
8 000 psi (55 MPa) for aluminum shall be obtained from the
tancetestofnewbaresoftsquareandrectangularwireintended
following:
for subsequent fabrication into magnet wire.
KW
P 5
NOTE 1—Since the applied unit stress and the time of application are
L
constant for all wire sizes, the test enables comparisons of stiffness to be
made between wires of the same or different size on the basis of the
where:
permanent elongation resulting from the application of a low unit stress.
P = Required load, lbs (N),
W = mass of specimen, g,
4. Apparatus
L = length of specimen, in., and
4.1 Tensile testing machines used for the low-stress elonga-
K = 102.74 for copper specimens, length in in., required
tion test shall conform to the requirements of Practices E4.
load in lb, or
K = 11 612.7 for copper specimens, length in mm, required
5. Test Specimens
load in N, or
5.1 The test specimens shall be taken from the finished reel
K = 180.5 for aluminum specimens, length in in., required
or coil with a minimum amount of handling and distortion,
load in lb, or
K = 20 401.9 for aluminum specimens, length in mm,
1
This test method is under the jurisdiction of ASTM Committee B01 on
required load in N.
Electrical Conductorsand is the direct responsibility of Subcommittee B01.02 on
NOTE 2—Where a large number of specimens are to be tested, the
Methods of Test and Sampling Procedure.
calculation of the required load (P) can be simplified by careful cutting of
Current edition approved April 1, 2004. Published May 2004. Originally
all test specimens to equal lengths. The use of a jig or a pair of vices with
approved in 1953. Last previous edition approved in 1998 as B279 – 98. DOI:
jaws set at a predetermined length apart can facilitate the cutting of equal
10.1520/B0279-04.
2 length specimens. With all specimens having an equal length, the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
specimen mass becomes the only variable and the required load (P) will
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on vary proportionately specimen to specimen with the specimen mass.
the ASTM website. Where the mass of the test specimen exceeds the capacity of the
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B279 − 04
available balance, a shorter length specimen may be used to determine the
7. Low-Stress Elongation
mass of the test specimen. The shorter specimen shall be cut from
...
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