Q1) In the given figure, a hexagonal bolt-and nut assembly that is made of steel is given. This assembly joins two members. The thread crest diameter is 14 mm and the root diameter is 12 mm. Use dw 1:5dc, but assume washers are thin enough that their contribution to joint stiffness can be neglected. Determine the member spring rate if a) Both members are made of aluminum b) The 15-mm thick member is made of aluminum and the 10-mm thick member is made of steel. 3/2 d- d 15 30 10 9 2 2 12.5 25 25