.P 4 Ans: Tθa = 245.8kN-m. To = 145.3kN-m In the cross-section (a) build from two segments the thickness of the outer skin is 12mm and the thickness of the inner web is 6mm. Consider: shear flow directions in (b), allowable shear stress of tal = 60MPa, allowable angle of twist θall = 3° for a beam with length of 4m, as well as G = 28GPa and calculate the allowable torque T for this structure.