82 



Tables 67-69 



MECHANICAL PROPERTIES. 



TABLE 57. — Copper. 



* Wire drawn cold from 3.18 mm (.0.125 m.) to 0.04 mm vo.o^s lu.; xjih.. r^ni. ^..ol. ^.^u.. ^..b-, - ^•.. 

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

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

 Shortened 5 per cent at 22.0 kg/mm^ or 31,300 Ib/in- load. 

 " 10 " " " 29.0 kg/mm^ " 41,200 lb/in2 



" 20 " " " 39.0 kg/mm2 " 55,400 Ib/in^ " 



Shearing strength, cast copper 21.0 kg/mm2 or 30,000 lb/in2 



Modulus of elasticity, electrolytic 12,200 kg/mm' or 17,400,000 Ib/m' 

 '< " " cast 7,700 kg/mm^ or 11,000,000 lb/ in'' 



" « " drawn, hard 12,400 kg/mm^ or 17,600,000 lb/in' 

 TABLE 58. — Rolled Copper — Specification Value. 

 Specification values: U. S. Navy Dept, 47C2, minimums for roUed copper, — Cu min. 99.5 



Description, temper and thickness. 



Rods, bars, and shapes: 



Soft 



Hard: to 9. 5 mm (i in.) incl. ..... 



Hard: 9.5 mm to 25.4 mm (i in.). 



Hard: 25.4 mm to 50.8 mm (2 in.) 



Hard: over 50.8 mm (2 in.) 



Sheets and plates: 



Soft 



Hard 



Tensile strength. 



kg/mm2 



21.0 

 33.0 

 31-5 

 28. o 

 24. S 



21.0 to 28.0 

 24-3 



lb/in2 



30,000 

 50,000 

 45,000 

 40,000 

 35>ooo 



30,000 to 40,000 

 35, 000 



Elong. in 50.8 

 or 2 in. — per cent. 



25 to 2S 



TABLE 59. — Copper Wire — Specification Values. 



SpecificGravity 8.89at 20° C (68°F). ... c • > 



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, 22W3, Mar, i, 1915) 



P-limit of hard-drawn copper wire must average 53 per cent of ultimate tensile strength for four largest sized wire* 

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

 Smithsonian Tables. 



