channel with lipped flanges. The lips are of constant thickness 1.27mm, while
the flanges increase linearly in thickness from 1.27mm where they meet the
lips to 2.54mm at their junctions with the web. The web has a constant
thickness of 2.54mm. The shear modulus G 26700MPa throughout. The
beam has an enforced axis of twist RR and is supported in such a way that
warping occurs freely but is zero at the mid-point of the web. If the beam
carries a torque of 100Nm, calculate the maximum shear stress according to
the theory of torsion for thin-walled sections. Ignore any effects of stress
concentration at the corners. Skip the distribution of warping.
Fig: 1