82 



TABLES 57-59 



MECHANICAL PROPERTIES. 

 TABLE 57. Copper. 



* Wire drawn cold from 3.18 mm (0.125 in.) to 0.64 mm (0.025 in.) Bull. Am. Inst. Min. Eng., Feb., 1919. 

 t Wire drawn at 150 C from 0.79 mm (0.031 in.) to 0.64 mm (0.025 in.) (Jeffries, loc. cit.). 

 Compression, cast copper, Ann. 15.9 mm (0.625 in.) diam. by 50.8 mm (2 in.) long cylinders. 

 Shortened 5 per cent at 22.0 kg/mm 2 or 31,300 lb/in 2 load. 

 10 " " 29.0 kg/mm 2 " 41,200 lb/in 2 



20 " " 39.0 kg/ mm 2 " 55,400 lb/in 2 ' 



Shearing strength, cast copper 21.0 kg/mm 2 or 30,000 lb/in 2 



Modulus of elasticity, electrolytic 12,200 kg/mm 2 or 17,400,000 lb/in 2 



cast 7,700 kg/ mm 2 or 11,000,000 lb/in 2 

 " " drawn, hard 12,400 kg/mm 2 or 17,600,000 lb/in 2 



TABLE 58. Rolled Copper Specification Value. 



Specification values: U. S. Navy Dept., 4?C2, minimums for rolled copper, Cu min. 99.5 



TABLE 59. Copper Wire Specification Values. 



Specific Gravity 8.89 at 20 C (68 F). 



Copper wire : Hard Drawn (and Hard-rolled flat copper of thicknesses corresponding to diameters of wire) 

 Specification values. (A. S. T. M. BI-IS, and U. S. Navy Dept., 22\V3, Mar. i, 1915-) 



P-limit of hard-drawn copper wire must average 55 per cent of ultimate 

 in table, and 60 per cent of tensile strength for smaller sizes. 



tensile strength for four largest sized wires 



SMITHSONIAN TABLES. 



