Chapter 6.4, Problem 6.65P

A shaft is made of a polymer having an elliptical cross section. If it resists an internal moment of M = 50 N · m, determine the maximum bending stress in the material (a) using the flexure formula, where l_z = $\frac{1}{4}$ π(0.08 m)(0.04 m)³, (b) using integration. Sketch a three-dimensional view of the stress distribution acting over the cross-sectional area. Here I_x = $\frac{1}{4}$ π(0.08m)(0.04m)^3.