A part has been designed for kinematic function and its dime

A part has been designed for kinematic function and its dimensions cannot be changed. To minimize deflections under the same loading in all directions irrespective of stress levels, which of these materials would you choose: polyethylene polymer, silicon nitride ceramic, aluminum metal, titanium metal, stainless steel metal, carbon-fibre reinforced expoxy composite. Why?

Solution

the material with the highest specific stiffness will give the smallest deflection