An aluminum alloy beam of hollow circular cross section is subjected to a bending moment...

An aluminum alloy beam of hollow circular cross section is subjected to a bending moment M about the z axis (Fig. 5.16). Determine (a) the normal stress at point A; (b) the normal stress at point B; (c) the radius of curvature of the beam of a transverse cross section. Given: M = 600 N . m,D = 60 mm, d = 40 mm, E = 70 GPa, and = 0.29.