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The Equations
𝐾=𝑃 (𝐿1+2𝐿2 )
tan−1( ∆𝐴
𝐿𝐴)𝑜𝑟 tan−1( ∆𝐵𝐿𝐵
)𝑜𝑟 tan−1( ∆𝐶𝐿𝐶)𝑜𝑟 tan−1( ∆𝐷
𝐿𝐷)
L
θΔ
Torsional Stiffness = Torque per degree
𝐾=𝑃 (𝐿1+2𝐿2 )
tan−1( ∆𝐴
𝐿𝐴)𝑜𝑟 tan−1( ∆𝐵𝐿𝐵
)𝑜𝑟 tan−1( ∆𝐶𝐿𝐶)𝑜𝑟 tan−1( ∆𝐷
𝐿𝐷)
𝐾=500 (33 )
tan−1( .1148.25 )
𝐾=1736𝑙𝑏∗ 𝑓𝑡𝑑𝑒𝑔
Torsional Stiffness