ASTM A900-01(R2018) pdf free download

ASTM A900-01(R2018) pdf free download.Standard Test Method for Lamination Factor of Amorphous Magnetic Strip
1. 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 determina- tion 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 µm]. N OTE 1—Lamination factor is also termed space factor or stacking factor. 1.2 The values and equations stated in customary (egs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently ofthe other. Combining values from the two systems may result in noncon- formance with this standard. 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Summary of Test Method
2.1 The laminated test specimen is oriented and aligned, then subjected to pressure in a compression device. The resulting volume is then determined from the measured speci- men height, width, and length. An equivalent solid volume is calculated from the specimen mass and the true density of the specimen material. The ratio of the calculated (equivalent solid) volume to the measured volume is the lamination factor.
3. Significance and Use
3.1 Lamination factor S indicates the deficiency of effective material volume which is due to the presence of oxides, roughness, insulating coatings, and other conditions affecting the strip surface. 3.2 This test method is used to predict the fraction of metal that is included in the volume of the firm coil wound from the specimen tape.
4. Interferences
4.1 This test method is predicated on correctly aligned test strips and uniform compression during test. Both of these conditions are difficult to meet whenever the test specimens have one or more elevated ridges running lengthwise along the surface of the strip. 4.2 This test method also presupposes that the test speci- mens are free from other defects, such as camber and waviness, that may affect the lamination factor.
5. Apparatus
5.1 Micrometers—Two types of micrometers are included for use in this test method as follows: 5.1.1 Motor-Operated, Deadweight (Not Spring) Actuated Micrometer, conforming to the following requirements: 5.1.1.1 The micrometer shall be a deadweight digital- or dial-type micrometer, having two ground and lapped circular surfaces with a capacity of not less than 0.030 in. [0.75 mm]. The movable face or presser foot shall have an area of 0.25 to 0.33 in. 2 [160 to 215 mm 2 ] and corresponding to a diameter of approximately 0.56 to 0.65 in. [14.2 to 16.5 mm]. 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 position. 5.1.1.2 The surface shall be parallel to within 0.000 05 in. [0.0012 mm] and the presser foot shall move on an axis perpendicular to the anvil. 5.1.1.3 The presser foot shall exert a steady pressure on the specimen of 7.0 to 8.0 psi [48 to 55 kPa]. 5.1.1.4 A digital readout is preferred. If an analog gauge is used, the dial shall be at least 2 in. [51 mm] in diameter. It shall be continuously graduated to read directly to 0.0001 in. [0.0025 mm] and shall be required with a telltale hand, if necessary, recording the number ofcomplete revolutions ofthe large hand.