The composite beam shown is formed by bonding together a brass rod and an aluminum rod of semicircular cross sections. The modulus of elasticity is 105 GPa for the brass and 70 GPa for the aluminum. Knowing that the composite beam is bent about a horizontal axis by couples of moment 900 N·m, determine the maximum stress (a) in the brass, (b) in the aluminum.
Fig. P11.47

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