2. An axial rod made of three different materials is fixed between two walls. (You can do this problem without a calculator.) EI = E = 10 Msi E2 = 2E = 20 Msi E3 = 3E = 30 Msi M = 0=10 x 10-6/F 02 = 20= 20 x 10-6/F () =30= 30 x 106/F A1 = A2 = A3 = A = 2 in LI = L2 = L; = L = 10 in. The temperature is decreased by 110 F. a) Determine the stress in material 1, 1. Specify tension or compression. b) Determine the deflection of point B. Specify + or -. Hint: It may be easier to solve the problem symbolically, in terms of E, o, A, L, AT, and then substitute the numbers at the end. Ans: 01 = 36 ksi (T), & = 2.5 x 102 in (-) B C D 2 3 L L L