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a. The act of twisting or turning.
b. The condition of being twisted or turned.
2. The stress or deformation caused when one end of an object is twisted in one direction and the other end is held motionless or twisted in the opposite direction.

[Middle English torcion, wringing pain in the bowels, from Old French torsion, from Late Latin torsiō, torsiōn-, a wringing pain, variant of Latin tortiō, from tortus, past particple of torquēre, to twist; see torsade.]

tor′sion·al adj.
tor′sion·al·ly adv.
References in periodicals archive ?
Rabeih and Crolla (1996) developed a torsional vibration model for a manual transmission truck coupled with a vehicle body longitudinal model and a vertical vibration model.
As the guideline developed, a need for better reciprocating compressor torsional vibration analysis guidelines was also identified.
All sawbones were subjected to horizontal torsional fatigue tests, horizontal torsional and axial compressive fatigue tests, four-point bending fatigue tests in anteroposterior (AP) and mediolateral (ML) directions and horizontal torsional destructive tests.
Contract notice for complete test torsional hydraulic cylinder - hydraulic swinging with the appropriate torque sensor.
Many factors affect the NVH performance of a vehicle, and among these torsional vibration of the drivetrain is one of the most crucial [1].
It is also compact and can filter torsional vibrations from the engine, eliminating the need for torsional dampers.
Finally, a modified stress-based fatigue life model is presented to predict the fatigue life of ABS under pure torsional and multiaxial loadings.
Calculates and shows cross section torsional displacement
6) To avoid the handicaps of the jackhammer effect, a new torsional emulsification motion which emulsifies the lens by shearing action was developed.
The team's research paper titled "Powerful, Multifunctional Torsional Micromuscles Activated by Phase Transition," was published in the journal Advanced Materials on Dec.
20 ( ANI ): Researchers have developed a micro-sized robotic torsional muscle/motor made from vanadium dioxide that for its size is a thousand times more powerful than a human muscle, able to catapult objects 50 times heavier than itself over a distance five times its length within 60 milliseconds.
But it can he estimated by assuming that just the root diameter carries the torque load, even though the flight adds to the screw's torsional strength.