Torsion Equation Derivation in Hindi || Torsion equation in hindi || torsion derivation in hindi

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where:

T = torque or twisting moment, [N×m, lb×in]
J = polar moment of inertia or polar second moment of area about shaft axis, [m4, in4]
τ = shear stress at outer fibre, [Pa, psi]
r = radius of the shaft, [m, in]
G = modulus of rigidity (PanGlobal and Reed’s) or shear modulus (everybody else), [Pa, psi]
θ = angle of twist, [rad]
L = length of the shaft, [m, in]
The nomenclature above follows the same convention as PanGlobal Power Engineering Training System.

Most common torsion problems will indicate the transmitted power (kW) at a certain rotational speed (rad/s or RPM). The equivalent torque can be found with:



where n[rad/s] = N[rev/min]×2π/60.

Polar moment of inertia
Similar to the moments of inertia that you learned before in rotational kinetics and bending of beams, the polar moment of inertia represents a resistance to twisting deformation in the shaft. General formulas for polar moment of inertia are given in Textbook Appendix C.

Note the difference between bending moments of inertia Ic and polar moments of inertia J, and use them appropriately. For instance, if you are dealing with a circular bar:

Ic = π d4 / 64, if the bar is used as a beam
J = π d4 / 32, if the bar is used as a shaft
Shear modulus
Called Modulus of Rigidity in PanGlobal and Reed’s, the shear modulus is defined (similarly as E) as ratio of shear stress to the shear strain. It is expressed in GPa or psi and typical values are given in Textbook Appendix B. Typical values are lower than Young’s Modulus E, for instance ASTM A36 steel has EA36 = 207 GPa and GA36 = 83 GPa.

Angle of twist
The torque deformation of a shaft due is measured by the twist angle at the end of the shaft. This angle of twist depends on the length of the shaft, as shown in the following figure:

by Barry Dupen [1]

The angle of twist, [radians] is used in the general torsion equation and in estimating the shear strain, γ (gamma), non-dimensional.



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Strength of Materials | Module 5 | TORSION EQUATION | (Lecture 49)











T = torque
r = radius
F = force
theta = angle between F and the lever arm
From the web
General torsion equation
T = torque or twisting moment, [N×m, lb×in] J = polar moment of inertia or polar second moment of area about shaft axis, [m4, in4] τ = shear stress at outer fibre, [Pa, psi] r = radius of the shaft, [m, in]

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