When a torque is applied to a twisted channel section, the primary stresses present on the side face are normal stress and shear stress. The specific distribution and magnitude of these stresses depend on the location of the applied torque and the geometry of the channel. A twisted channel section may experience a combination of these stresses due to its unique shape, which can influence how the material behaves under load. Understanding these stress types is crucial for predicting potential failure modes in structural applications. The discussion emphasizes the importance of analyzing both normal and shear stresses in engineering design.