The figure shows a beam firmly fixed to a rigid wall at the left end, A....

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The figure shows a beam firmly fixed to a rigid wall at the left end, A. The beam is a composite with an aluminum core with polar moment of the area, Ipa, and a cylindrical steel sheath with polar moment of the area Ips. The diameters of the two sections are Da and Ds, respectively, as shown in the cross section view, below. The composite beam has a total length, L. On the right end, the beam is fixed to a rigid plate, such that the two materials are forced to rotate together. A concentrated torque is applied at B, To, as shown. The steel has shear modulus, Gs, while the aluminum has a shear modulus, Ga. Rigid Wall A Gs Steel SIDE VIEW Ga Aluminu Rigid Plate → To CROSS SECTION VIEW Ds Find an expression for the maximum shear stress in the entire structure. The figure shows a beam firmly fixed to a rigid wall at the left end, A. The beam is a composite with an aluminum core with polar moment of the area, Ipa, and a cylindrical steel sheath with polar moment of the area Ips. The diameters of the two sections are Da and Ds, respectively, as shown in the cross section view, below. The composite beam has a total length, L. On the right end, the beam is fixed to a rigid plate, such that the two materials are forced to rotate together. A concentrated torque is applied at B, To, as shown. The steel has shear modulus, Gs, while the aluminum has a shear modulus, Ga. Rigid Wall A Gs Steel SIDE VIEW Ga Aluminu Rigid Plate → To CROSS SECTION VIEW Ds Find an expression for the maximum shear stress in the entire structure.