P6 The thin walled section shown in the figure is symmetrical about the x-

axis. The thickness to of the center web 34 is constant, while the

thickness of the other walls varies linearly from to at points 3 and 4 to

zero at the open ends 1, 6, 7, and 8. Determine the torsion constant / for

the section and also the maximum value of the shear stress due to an

arbitrary torque T. Do not determine the warping displacements of the

section.