(Solved):   Pictured below is a cobalt chrome hip stem (elastic modulus is \( 200 \mathrm{GPa} \) ) wi ...

 

Pictured below is a cobalt chrome hip stem (elastic modulus is \( 200 \mathrm{GPa} \) ) with a stem diameter of \( 15 \mathrm{~mm} \). For testing, the bottom end of the stem is cemented and held fixed, while the top of the stem is loaded with a vertical, F, of \( 3000 \mathrm{~N} \). a) Draw the freebody diagram of the stem from the load point to the section \( 50 \mathrm{~mm} \) below the load point. b) What is the total normal stress at each point: \( \mathrm{A}, \mathrm{B}, \mathrm{C} \) and \( \mathrm{D} \) ? c) If the material fails due to the most tensile normal stress which of the points will be the point of fracture initiation?