The implant material is CoCr alloy with an UTS = 800MPa and E = 230GPa.
i. Will the neck ever fracture if the endurance limit is 350MPa? (The endurance limit is the stress at which the material will not break even under repeated cyclic loading.)
ii. What is the stress at the base of the neck during the stance phase of gait when the joint reaction force is 2400 N ?
iii. What is the stress in the neck if the implant is made out of a material with a modulus equal to that of cortical bone (E = 20 GPa)?