CIVE 2700 Lecture Notes - Lecture 5: Rockwell Scale, Brazing, Shear Modulus

• School: Carleton University
• Department: Civil Engineering
• Course: CIVE 2700
• Professor: John Gales

Document Summary

Aluminum: alu(cid:373)i(cid:374)u(cid:373) (cid:396)ep(cid:396)ese(cid:374)ts 8% of ea(cid:396)th(cid:859)s (cid:272)(cid:396)ust, very difficult to produce! High temp and energy required to make the metal: production to aluminum second only to steel, alloy 6061-t6 is most popular for structural applications. Low melting point (660 c with steel at around 1370 c)(issue in high rise buildings) 5x more expensive than steel (except stainless steel which is more expensive than al: aluminum best used in weight critical applications such as: bridge deck replacements (dead load reduction), cranes and booms, remote locations, etc. In buildings/construction, the initial high cost of al is offset by its lightweight-ness, resistance to corrosion, reduced maintenance and appearance: aluminum instantly forms a protective oxide layer (aluminum-oxide in this case) when exposed to the atmosphere. The aluminum-oxide layer is transparent (extremely thin), a(cid:374)d does(cid:374)(cid:859)t (cid:396)e(cid:395)ui(cid:396)e (cid:272)oati(cid:374)g (cid:449)hi(cid:272)h sa(cid:448)es 133391333913339. Name proposed by sir humphrey davy in 1808, also 1886 by charles hall (usa) and paul.