Mechanics of Materials Question?

Posted on 2015-09-30 06:55:00 in Engineering by JON

I've been attempting this problem for awhile now and can't get the answer. Please help! 



The pin-connected structure shown in the figure consists of a rigid beam ABCD and two supporting bars. Bar (1) is a bronze alloy [E = 91 GPa] with a cross-sectional area of A1 = 210 mm2. Bar (2) is an aluminum alloy [E = 73 GPa] with a cross-sectional area of A2 = 590 mm2. All bars are unstressed before the load P is applied; however, there is a 3-mm clearance in the pin connection at A. If a load of P = 111 kN is applied at B, determine 



(a) the normal stresses in both bars (1) and (2). 

(b) the downward deflection of point A on the rigid bar.

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