ASTM B976-11
(Specification)Standard Specification for Fiber Reinforced Aluminum Matrix Composite (AMC) Core Wire for Aluminum Conductors, Composite Reinforced (ACCR)
Standard Specification for Fiber Reinforced Aluminum Matrix Composite (AMC) Core Wire for Aluminum Conductors, Composite Reinforced (ACCR)
ABSTRACT
This specification covers fiber reinforced, aluminum matrix composite wire used for mechanical reinforcement in the manufacture of aluminum conductor, composite reinforced (ACCR). This wire consists of continuous filament fibers of aluminum oxide in a matrix of aluminum. The fiber reinforcement shall be continuous tows of aluminum oxide. Before stranding, the composite core wire of any diameter shall conform to the tensile breaking load requirements.
SCOPE
1.1 This specification covers fiber reinforced, aluminum matrix composite core wire used for mechanical reinforcement in the manufacture of aluminum conductor, composite reinforced (ACCR). This wire consists of continuous filament fibers of aluminum oxide in a matrix of aluminum.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.2.1 Exception—Some non-standard SI units provided for information only do not appear in brackets.
1.3 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B976 −11
StandardSpecification for
Fiber Reinforced Aluminum Matrix Composite (AMC) Core
Wire for Aluminum Conductors, Composite Reinforced
(ACCR)
This standard is issued under the fixed designation B976; 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 3.1.1 fiber reinforced aluminum matrix composite wire, n—a
wire consisting of two constituents: the first a number of
1.1 This specification covers fiber reinforced, aluminum
continuousfibersofaluminumoxidealongtheaxisofthewire,
matrix composite core wire used for mechanical reinforcement
which is embedded in the second constituent of aluminum
in the manufacture of aluminum conductor, composite rein-
metal, as shown in Fig. 1.
forced (ACCR). This wire consists of continuous filament
fibers of aluminum oxide in a matrix of aluminum. 3.1.2 lot, n—unless otherwise specified in the contract or
order, a lot shall consist of all coils of wire of the same
1.2 The values stated in inch-pound units are to be regarded
diameter submitted for inspection at the same time.
as standard. The values given in parentheses are mathematical
3.1.3 production unit, n—a reel, spool, or other package of
conversions to SI units that are provided for information only
and are not considered standard. wire that represents a single usable length.
1.2.1 Exception—Some non-standard SI units provided for
3.1.4 sample, n—the production unit(s) from which a test
information only do not appear in brackets.
specimen(s) has been removed, and which is considered to
have properties representative of the lot.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1.5 specimen, n—a length of wire removed for test pur-
responsibility of the user of this standard to establish appro-
poses.
priate safety and health practices and determine the applica-
3.1.6 tow, n—a bundle, containing multiple fibers.
bility of regulatory limitations prior to use.
3.1.7 AMC, n—Aluminum Matrix Composite, a material
2. Referenced Documents
consisting of two constituents: the first a series of continuous
2.1 The following documents of the issue in effect on date fibers of aluminum oxide which is embedded in the second
of material purchase form a part of this specification to the constituent of aluminum metal.
extent referenced herein.
3.1.8 ACCR, n—Aluminum Conductor Composite
2.2 ASTM Standards: Reinforced, a concentric-lay-stranded conductor made up of
B193 Test Method for Resistivity of Electrical Conductor outer aluminum strands of hard, heat resistant aluminum wires
Materials and a core of round, aluminum matrix composite wire(s), for
use as overhead electrical conductors.
B830 Specification for Uniform Test Methods and Fre-
quency
D3552 Test Method for Tensile Properties of Fiber Rein- 4. Ordering Information
forced Metal Matrix Composites
4.1 Orders for material under this specification shall include
the following information:
3. Terminology
4.1.1 Quantity of each size,
3.1 Definitions of Terms Specific to This Standard:
4.1.2 Wire size (see 8.1),
4.1.3 Place of inspection (see 11.1),
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on 4.1.4 Package size and type (see 12.1)
Conductors of Light Metals.
4.1.5 Special package marking
Current edition approved April 1, 2011. Published May 2011. DOI: 10.1520/
B0976-11.
5. Materials and Manufacture
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 The fiber reinforcement shall be continuous tows of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. aluminum oxide.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B976−11
NOTE 1—Dark Phases are fiber viewed end-on and the light phase is aluminum matrix. The equivalent diameter of the fibers is approximately 470 µin.
(12 µm).
FIG. 1Polished Cross-section of an Aluminum Matrix Composite Wire.
5.2 The core wires shall be of such quality and purity that 7. Density and Resistivity
the finished product shall have the approximate properties and
7.1 For the purposes of calculating mass per unit length,
characteristics prescribed in this specification, including break-
cross-sections, and so forth, the density of the composite wire
ing load, elongation, modulus properties, and electrical resis- 3 3
at 20°C shall be taken as 0.122 lb/in. (3370 kg/m ).
tivity requirements set forth in Table 1.
7.2 Electrical resistivity, determined on samples selected
and tested in accordance with Test Method B193, shall not
6. Tensile Test
exceed 43.2Ω·cmil/ft (0.0718Ω·mm /m) at 68°F (20°C).
6.1 Before stranding, the composite core wire of any diam-
7.3 Equivalent conductivity; the wire shall meet or exceed
eter shall conform to the tensile breaking load requirements set
24.0 % IACS at 68°F (20°C).
forth in Table 2 (see Explanatory Note 1).
7.4 The temperature coefficient of resistance at 20°C is
6.2 Test Method—Tensile testing of metal matrix composite
taken as 0.00404.
materials is covered by D3552, including the need for stringent
test frame alignment. However, this standard does not specify
8. Dimensions and Permissible Variations
testing of round metal matrix composite wire samples. Thus,
for AMC core wire samples, the tensile test shall use a 8.1 The specified diameter shall be expressed in inches to
minimum gauge length of 24 in. (610 mm) (see Explanatory
four decimal places or in millimeters to two decimal places.
Note 2). Each end of the wire shall be adhesively bonded to a
8.2 Measure the diameter of each specimen with a microm-
depth of 4 in. (100 mm) into a 6 in. (150 mm) long steel
eter caliper to the nearest 0.0005 in. or 0.01 mm. Take two
gripping tube. A Hi-flex epoxy is suggested such as Scotch-
measurements at one location, the second 90° from the first.
Weld DP-810 Hi-flex epoxy adhesive. The test machine grip-
Average the two measurements to obtain the specimen diam-
ping jaws shall grip the end section of the tube that contains no
eter. The specimen diameter shall not vary from the specified
wire. Direct gripping of the core wire in the test machine jaws
diameter by more than 6 0.0035 in. (6 0.09 mm) for all wire
without end tubes is not permitted, unless the tester can
diameters.
demonstrate the effect of direct gripping on the wire does not
8.3 Continuous process control using an optical diameter
cause failure of the wire within the gripping length. The
measurement device, or other methods, may be substituted in
cross-head speed shall provide a strain rate of 0.002in./in./min
accordance with section 8.2 if the teste
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