This lesson covers the concept of torsion of non-circular shafts, focusing on the application of torsion and the resulting warping. It explains how shear stress acts parallel to the outer boundary of the section and introduces Prandtl’s stress function. The lesson further elaborates on how to calculate shear stress at a point and how it acts parallel to the boundary. It also discusses the relationship between the angle of twist per unit length, the cross-sectional dimensions, and the applied torque. The lesson concludes with examples of elliptical and triangular sections, demonstrating how to calculate the maximum stress and its direction.

- Torsion of non-circular shafts results in warping, which is a solution of the Laplace equation.
- Shear stress acts parallel to the outer boundary of the section and cannot act normal to the boundary.
- Prandtl’s stress function helps in calculating the shear stress at a point.
- The angle of twist per unit length is related to the cross-sectional dimensions and the applied torque.
- The maximum stress and its direction can be calculated using the given cross-sectional dimensions and the applied torque.

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