torsionˈtɔr ʃən
English Definitions:
tortuosity, tortuousness, torsion, contortion, crookedness (noun)
a tortuous and twisted shape or position
"they built a tree house in the tortuosities of its boughs"; "the acrobat performed incredible contortions"
torsion, torque (noun)
a twisting force
torsion (Noun)
The act of turning or twisting, or the state of being twisted; the twisting or wrenching of a body by the exertion of a lateral force tending to turn one end or part of it about a longitudinal axis, while the other is held fast or turned in the opposite direction.
torsion (Noun)
That force with which a thread, wire, or rod of any material, returns, or tends to return, to a state of rest after it has been twisted; torsibility.
Torsion
In solid mechanics, torsion is the twisting of an object due to an applied torque, therefore is expressed in N·m or ft·lbf. In sections perpendicular to the torque axis, the resultant shear stress in this section is perpendicular to the radius. For shafts of uniform cross-section the torsion is: where: ⁕ is the maximum shear stress at the outer surface ⁕JT is the torsion constant for the section. It is identical to the second moment of area Jzz for concentric circular tube, or round solid shafts only. For other shapes J must be determined by other means. For solid shafts the membrane analogy is useful, and for thin walled tubes of arbitrary shape the shear flow approximation is fairly good, if the section is not re-entrant. For thick walled tubes of arbitrary shape there is no simple solution, and finite element analysis may be the best method. ⁕r is the distance between the rotational axis and the furthest point in the section. ⁕ℓ is the length of the object the torque is being applied to or over. ⁕θ is the angle of twist in radians. ⁕G is the shear modulus or more commonly the modulus of rigidity and is usually given in gigapascals, lbf/in², or lbf/ft².
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