ASTM B566-04a(R2021) pdf free download

ASTM B566-04a(R2021) pdf free download.Standard Specification for Copper-Clad Aluminum Wire
6. General Requirements
6.1 Tensile Strength and Elongation—The copper-clad alu- minum wire shall conform to the tensile strength and elonga- tion requirements of Table 1. For intermediate diameters not listed in Table 1, the elongation requirements of the next smaller size shall apply; in the case of tensile strength the requirements of the next larger size shall apply. 6.2 Resistivity—The electrical resistivity at a temperature of 20 °C shall not exceed the values prescribed in Table 2. See Note 1 for calculating electrical resistance. N OTE 1—Relationships which may be useful in connection with the values of electrical resistivity prescribed in this specification are shown in Table 3. Resistivity units are based on the International Annealed Copper Standard (IACS) adopted by IEC in 1913, which is 1 ⁄ 58 Ω·mm 2 /m and the value of 0.15328 Ω·g/m 2 at 20 °C are, respectively, the international equivalent of volume and weight resistivity of annealed copper equal to 100 % conductivity. The later term means that a copper wire 1 m in length and weighing 1 g would have a resistance of0.15328 Ω. This is equivalent to a resistivity value of875.20 Ω·lb/mile 2 , which signifies the resistance of a copper wire 1 mile in length weighing 1 lb. It is also equivalent, for example, to 1.7241 µΩ/cm oflength ofa copper bar 1 cm 2 in cross section. A complete discussion of this subject is contained in NBS Handbook 100. The use of five significant figures in expressing resistivity does not imply the need for greater accuracy of measurement than that specified in Test Method B193. The use of five significant figures is required for complete reversible conversion from one set of resistivity units to another. 6.3 Cohesion—The copper-clad aluminum wire, when tested in accordance with 10.4, shall be free from seams or splits. Examination ofthe wire shall be made at a magnification not to exceed 10×. 6.4 Adhesion—The copper-clad aluminum wire, when tested in accordance with 10.5, shall be free from cladding delamination. Examination of the wire shall be made at a magnification not to exceed 10×. 6.5 Joints—The finished wire shall contain no joints or splices.
10. Test Methods
10.1 Tensile Strength and Elongation—The tensile strength, expressed in pounds-force per square inch (or megapascals), shall be obtained by dividing the maximum load attained by the specimen during the tension test, by the original cross-sectional area of the specimen. Tensile strength and elongation may be determined simultaneously on the same specimen. 10.1.1 The elongation of wire may be determined as the permanent increase in length, expressed in percent of the original length, due to the breaking of the wire in tension, measured between gage marks placed originally 10 in. (250 mm) apart upon the test specimen (Note 3). The elonga- tion of wire shall be determined as described preceding or by measurements made between the jaws of the testing machine. When the latter method is used, the zero length shall be the distance between the jaws at the start of the tension test when approximately 10 % of the specified tensile strength has been applied and be as near 10 in. as practicable and the final length shall be the distance between the jaws at the time of rupture.
The fracture shall be between gage marks in the case of specimens so marked or between the jaws of the testing machine and not closer than 1 in. (25 mm) to either gage mark or either jaw. N OTE 3—It is known that the rate of loading during tension testing affects the performance of the sample to a greater or lesser extent depending upon many factors. In general, tested values of tensile strength are increased and tested values of elongation are reduced with increase of speed of the moving head of the testing machine. In case of tests on soft or annealed wire, however, the effects of speed of testing are not pronounced. Tests of soft wire made at speeds of moving head which under no-load conditions are not greater than 12 in./min (300 mm/min) do not alter the final results of tensile strength and elongation determinations to any practical extent. In the case of hard-drawn wire, these effects are pronounced when the speed of the moving head is excessive. It is suggested that tests be made at speeds of moving head which, under no-load conditions, are not greater than 3 in./min (76 mm/min), but in no case at a speed greater than that at which correct readings can be made.