ASTM A900-91(1996)e1
(Test Method)Standard Test Method for Lamination Factor of Amorphous Magnetic Strip (Withdrawn)
Standard Test Method for Lamination Factor of Amorphous Magnetic Strip (Withdrawn)
SCOPE
1.1 This test method covers measurements of lamination factor (Note 1) of a specimen composed of strips cut from amorphous magnetic material. It is suitable for the determination of lamination factor for thin, flat case, metallic strip ranging in width from 0.25 to 8.00 in. [6.35 mm to 203 mm] and in thickness from 0.0005 to 0.005 in. [12.7 to 127 [mu]m]. Note-Lamination factor is also termed space factor or stacking factor.
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.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values in brackets are provided for information only.
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Standards Content (Sample)
e1
Designation: A 900 – 91 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Lamination Factor of Amorphous Magnetic Strip
This standard is issued under the fixed designation A 900; 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.
e NOTE—Editorial corrections were made throughout in April 1996.
1. Scope 4.2 This test method is used to predict the fraction of metal
that is included in the volume of the firm coil wound from the
1.1 This test method covers measurements of lamination
specimen tape.
factor (Note 1) of a specimen composed of strips cut from
amorphous magnetic material. It is suitable for the determina-
5. Interferences
tion of lamination factor for thin, flat case, metallic strip
5.1 This test method is predicated on correctly aligned test
ranging in width from 0.25 to 8.00 in. [6.35 mm to 203 mm]
strips and uniform compression during test. Both of these
and in thickness from 0.0005 to 0.005 in. [12.7 to 127 μm].
conditions are difficult to meet whenever the test specimens
NOTE 1—Lamination factor is also termed space factor or stacking
have one or more elevated ridges running lengthwise along the
factor.
surface of the strip.
1.2 This standard does not purport to address all of the
5.2 This test method also presupposes that the test speci-
safety concerns, if any, associated with its use. It is the
mens are free from other defects, such as camber and waviness,
responsibility of the user of this standard to establish appro-
that may affect the lamination factor.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 6. Apparatus
1.3 The values stated in inch-pound units are to be regarded
6.1 Micrometers—Two types of micrometers are included
as the standard. The values in brackets are provided for
for use in this test method as follows:
information only.
6.1.1 Motor-Operated, Dead-Weight (not spring) Actuated
Micrometer, conforming to the following requirements:
2. Referenced Documents
6.1.1.1 The micrometer shall be a dead-weight digital or
2.1 ASTM Standards: dial-type micrometer, having two ground and lapped circular
A 34 Practice for Procurement Testing, and Sampling of
surfaces with a capacity of not less than 0.030 in. [0.75 mm].
Magnetic Materials The movable face or presser foot shall have an area of 0.25 to
2 2 2
0.33 in. . [200 mm +15,−40 mm ] and corresponding to a
3. Summary of Test Method
diameter of approximately 0.56 to 0.65 in. [14.2 to 16.5 mm].
3.1 The laminated test specimen is oriented and aligned, The fixed face or anvil shall be of such size that the whole area
of the presser foot is in contact with the anvil in the zero
then subjected to pressure in a compression device. The
resulting volume is then determined from the measured speci- position.
6.1.1.2 The surface shall be parallel to within 0.00005 in.
men height, width, and length. An equivalent solid volume is
calculated from the specimen mass and the true density of the [0.0012 mm] and the presser foot shall move on an axis
perpendicular to the anvil.
specimen material. The ratio of the calculated (equivalent
solid) volume to the measured volume is the lamination factor. 6.1.1.3 The presser foot shall exert a steady pressure on the
specimen of 7.0 to 8.0 psi [48 to 55 kPa].
4. Significance and Use
6.1.1.4 A digital read-out is preferred. If an analog gage is
used, the dial shall be at least 2 in. [51 mm] in diameter. It shall
4.1 Lamination factor S indicates the deficiency of effective
be continuously graduated to read directly to 0.0001 in.
material volume which is due to the presence of oxides,
[0.0025 mm] and shall be required with a tell-tale hand, if
roughness, insulating coatings, and other conditions affecting
necessary, recording the number of complete revolutions of the
the strip surface.
large hand.
6.1.1.5 The micrometer shall be capable of repeating its
This test method is under the jurisdiction of ASTM Committee A-6 on
readings to 0.00005 in. [0.0012 mm] at zero setting or on a
Magnetic Properties and is the direct responsibility of Subcommittee A06.01 on Test
steel gage block.
Methods.
6.1.1.6 The deviations for the parts of the scale correspond-
Current edition approved Feb. 19, 1991. Published April 1991.
Annual Book of ASTM Standards, Vol 03.04. ing to the specimen thickness measured shall be applied as
A 900
corrections to the thickness reading. 8. Procedure
6.1.1.7 The frame of the micrometer shall be of such rigidity
8.1 Select a representative segment from each sample of
that a load of 3 lb [1.5 kg] applied to the dial housing, out of
material to be tested and cut the required number of strips as
contact with either the weight or the presser foot spindle, will
specified in 7.5 to a length as specified in 7.2.
produce a deflection of the frame not greater than 0.0001 in.
8.2 Stack the test strips directly on top of one another in the
[0.0025 mm], as indicated on the micrometer dial.
aligning fixture. Maintain the proper directionally as in Fig. 2.
6.2 Manually-Operated Dead-Weight (not spring) Actuated
8.3 Align the edges of the strips and secure the stack by
Dial-Type Micrometer, conforming to the general requirements
cl
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