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 footpound 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.
Related:
Structural Beam Deflection and Stress Formula and Calculation
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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 
c_{1} 
Hollow shaft inner radius 
c_{2} 
Shaft outer radius 
L 
Length of the shaft 
G 
Modulus of rigidity 
w 
Rotation speed 
P 
Power 
K 
Stress concentration factor 