A laminate that consists of pairs of layers with identical thickness and elastic properties, but oriented in opposite directions (such as +θ and –θ) with respect to the laminate reference, is defined as a Balanced laminate. This specific configuration ensures that the laminate remains balanced by counteracting the anisotropic stresses and strains induced by the angular orientation, achieving stability and minimizing deformation under load.
A two-cell wing box has wall thickness 1.5 mm and shear modulus \(G = 27\ \text{GPa}\). A torque of 12 kNm is applied. Determine the shear stress in wall AD (round off to one decimal place). 