Carbon fiber profile and polyurethane foam were bonded as shown in Figure 1a. Elastic modulus of carbon fiber is 30 GPa and elastic modulus of polyurethane foam is 5 GPa. Both materials have square cross section. Carbon fiber's dimensions are 40 x 40 mm, and polyurethane foam's dimensions are 30 x 30 mm. These materials were tested in three-point bending conditions as shown in Figure 1b. The support distance was 130 mm and maximum force was recorded as 20 kN and applied at the middle of the support span. Find the maximum bending stresses in carbon fiber and polyurethane foam. (50 points) Figure 1a Cross section view of Figure 1b (it was cut from plane a-a) 130 Figure 1b