### Shaft Torsion Stress Calculator and Equations

Mechanics of Materials Table of Content

In solid mechanics , torsion is the twisting of an object due to an applied torque . It is expressed in newton meters(N·m) or foot-pound force (ft·lbf). In sections perpendicular to the torque axis, the resultant shear stress in this section is perpendicular to the radius.

Shear stress is zero on the axis passing through the center of a shaft and maximum at the outside surface of a shaft. On an element where shear stress is maximum, normal stress is 0. This element where maximum shear stress occursis oriented in such a way that its faces are either parallel or perpendicular to the axis of the shaft as shown in the figure. To obtain stress in other orientations, plane stress transformation is needed for shear stresses found with this calculator. ALL calculators require a Premium Membership

List of Equations:
 Description Symbol Equation Shear stress τ Angle of twist θ Maximum shear stress τ max Polar moment of inertia of solid shaft J Polar moment of inertia of hollow shaft J Power P P = [(T/12) x w]/5252

 Symbol Description T Torque to be transmitted J Polar moment of inertia p Radial distance to center of shaft c1 Hollow shaft inner radius c2 Shaft outer radius L Length of the shaft G Modulus of rigidity w Rotation speed P Power K Stress concentration factor