A rectangular section of 150 x 300 mm is subjected to a positive bending moment of 240,000N•m with respect to the “strong” axis. The material of the
beam is not isotropic and is such that the modulus of elasticity in tension is 1 ½ times that in compression (see figure). If the efforts do not exceed the limit proportional, find the maximum stresses of tension and compression in the beam.