Question

At a temperature of 60°F, a 0.04-in. gap exists-between the ends of the two bars shown. Bar (1) is an aluminum alloy [E = 10,000 ksi; v = 0.32; a =13.9 x 10-6/°F] bar with a width of 3 in. and a thickness of 0.75 in. Bar (2) is a stainless steel [E =28,000 ksi; v = 0.12; a = 8.3 x 106/°F] bar with a width of 2 in. and a thickness of 0.75 in. The supports at A and Care rigid. Determine the lowest temperature at which the two bars contact each other.

Fig: 1

Fig: 2