Question

Problèm GIVEN b 2) Three rod elements shown above are stress free when they are assembled together and attached to the rigid walls A and D. Element (1) is steel with E1 30 x 103ksi, cross - sectional area Ai - 2.0 in, length L1-80 in and coefficient of thermal expansion α1=7x10-6/0F; the corresponding values for the aluminum element (2) are: E2 10 x 103ksi, A2-3.6 in, L,- 60 in, a2 13 x 10-6/oF; the corresponding values for the bronze element (3) are: Es 15 x 103ksi, A3 4.8 in2, L3 80 in, a 10 x 10-6/°F. The applied force P at point B is 40 ksi. EIND a) Determine the support reactions if the temperature is raised by AT 85°F. b) Determine the axial stresses ơ, ơ2 and ơ3 in the rods (1), (2) and (3). c) Determine the displacement uc of the joint at C

Answer 1