Torsion (mechanics)

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In solid mechanics, torsion is the twisting of an object caused by an applied torque. It may be described as an angular deformation, measured by the rotation of a cross-section from its undeformed position. Torque is commonly expressed in newton metres (N·m) or foot-pound force (ft·lbf), while the resulting torsional shear stress is expressed in pascals (Pa) or pounds per square inch (psi). In a circular shaft, the shear stress is tangent to circles centred on the shaft axis. In non-circular cross-sections, twisting is accompanied by warping, so transverse sections do not generally remain plane. Under uniform, unrestrained Saint-Venant torsion, torque and twist are related by T = G J T Θ = G J T...

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