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### Circular Section Deformation and Stress Torsional Deformation Stress Equation and Calculator

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Torsional Deformation and Stress Circular Section Equations and Calculator.

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Torsional Deformation and Stress Solid Circular Sector Calculator

K = Cr^{4} where C varies with α / π as follows:

For 0 ≤ α / π ≤ 2.0

C = 0.0034 - 0.0697 (α / π) + 0.5825 (α / π)^{2} - 0.2950 (α / π)^{3} + 0.0874 (α / π)^{4} - 0.0111 (α / π)^{5}

Angle of Twist under applied Torque Moment

θ = ( T L ) / ( K G )

Shear Stress

For 0 ≤ α / π ≤ 1.0

B = 0.0117 - 0.2137 (α / π) + 2.2475 (α / π)^{2} - 4.6709 (α / π)^{3} + 5.1764 (α / π)^{4} - 2.2000 (α / π)^{5}

τ_{max} = T / B r^{3} on a radial boundary

Where:

θ = angle of twist (radians)

α = degrees

T = Twisting or torque moment force-length, (in-lbs, N-mm)

L = Length (in, mm)

r = Radius (in, mm)

τ = Unit shear stress force / area (lbs/in^{2}, N/mm^{2})

G = Modulus of rigidity force / area (lbs/in^{2}, N/mm^{2})

K = Polar Moment of Inertia (in^{4}, mm^{4}) for section

Reference:

Roarks Formulas for Stress and Strain, 7th Edition, Table 10.1 Formulas for torsional deformation and stress.