A short post is made by filling a standard 6x6x- steel tube with concrete, as shown in Figure P3-67. The steel has an allowable stress of 21 600 psi. The concrete has a rated strength of 6000 psi, but, in this application, the stress is to be limited to 500 psi. See Section 2-10 for the modulus of elasticity for the concrete. Compute the allowable load on the post.

The composite shaft shown consists of a solid brass segment (1) and a solid aluminum segment (2) that are connected at flange B and securely attached to rigid walls at A and C. Brass segment (1) has a diameter of 18 mm, a length of L₁ 235 mm, and a shear modulus of 39 GPa. Aluminum segment (2) has a diameter of 24 mm, a length of L₂ = 165 mm, and a shear modulus of 28 GPa. If a concentrated torque of 270 N-m is applied to flange B, determine (a) the maximum shear stress magnitudes in segments (1) and (2). (b) the rotation angle of flange B relative to support A. N 235 mm (1) B 165 mm Partial Ans: Max shear stress in Member 1 is 55.7 MPa 270 N-m (2)