$2\mathrm{.}7$ Design Problem

Member AB in the structure shown consists of a rod made of the same grade of aluminum that you tested in this laboratory. The link EF is made of steel of the same grade as the steel specimen tested. Using a factor of safety of $2\mathrm{.}5$ on ultimate stress, determine:

a$)$ the required diameter of the rodAB

b$)$ the required cross$-$sectional area of Link EF

Assume that the tensile and compressive strengths are the same.