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### Shaft with Four Keyways Torque Applied Deformation and Stress Equations and Calculator

**Beam Deflection and Stress Equation and Calculators**

Torque Applied Deformation and Stress of a Shaft with Four Keyways Equations and Calculator

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Torque Applied Deformation and Stress of a Shaft with Four Keyway Section Calculator

K = 2Cr^{4}

Varies with b / r as follows

For:

0 ≤ b / r ≤ 0.4

Where 0.3 ≤ a / b ≤ 1.2

Angle of Twist under applied Torque Moment

θ = ( T L ) / ( K G )

Shear Stress Maximum

At M:

Where B varies with b / r as follows:

for 0.2≤ b / r ≤ 0.4

for 0.5 ≤ a / b ≤ 1.2

Where:

θ = angle of twist (radians),

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

L = Length of Section (in, mm),

h = Length as Indicated (in, mm),

r = radius (in, mm),

a,b = Distance as shown (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.

Related:

The Shaft Design Book (Design Charts and Calculations for Torsional Properties of Non-Circular Shafts)