torsion (redirected from extorsion)

torsion, stress on a body when external forces tend to twist it about an axis. See strength of materials.

---

torsion

a. the twisting of a part by application of equal and opposite torques at either end

b. the condition of twist and shear stress produced by a torque on a part or component

---

torsion [′tȯr·shən]

(mathematics)

The rate of change of the positive direction of the binormal of a space curve with respect to arc length along the curve; its sign is defined as positive if it is in the same direction as the principal normal, and negative if it is in the opposite direction. Also known as second curvature.

(mechanics)

A twisting deformation of a solid body about an axis in which lines that were initially parallel to the axis become helices.