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elongated section with axis of symmetry

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Shear Stress Maximum

Angle of Twist under applied Torque Moment

θ = ( T L ) / ( K G )

Shear Stress Maximum

For all solid sections of irregular form the maximum shear stress occurs at or very near one of the points where the largest inscribed circle touches the boundary,* and of these, at the one where the curvature of the boundary is algebraically least. (Convexity represents positive and concavity negative curvature of the boundary.) At a point where the curvature is positive (boundary of section straight or convex) this maximum stress is given approximately by:

Shear Stress Maximum


Shear Stress Maximum

* Unless at some point on the boundary there is a sharp reentant angle, causing high local stress.


θ = angle of twist (radians),
α = degrees,
T = Twisting or torque moment force-length, (in-lbs, N-mm),
L = Length (in, mm),
D = Diameter of largest inscribed circle (in, mm),
A = area of section (in2, mm2)
Ix = moment of inertia about axis of symmetry (in4, mm4),
U = Center Line Length (in, mm),
τ = Unit shear stress force / area (lbs/in2, N/mm2),
G = Modulus of rigidity force / area (lbs/in2, N/mm2),
K = Polar Moment of Inertia (in4, mm4) for section


Roark's Formulas for Stress and Strain

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