The cross section of a sandwich beam consisting of aluminum alloy faces and a foam core is shown in the figure. The width b of the beam is 8.0 in., the thickness t of the faces is 0.25 in., and the height hc of the core is 5.5 in. (total height h = 6.0 in.). The moduli of elasticity are 10.5 x 106 psi for the aluminum faces and 12,000 psi for the foam core. A bending moment M = 40 k-in. acts about the z axis
Determine the maximum stresses in the faces and the core using (a) the general theory for composite beams, and (b) the approximate theory for sand which beams.

Transcribed Image Text:

h C