rotational stress

rotational stress

      physiological changes that occur in the body when it is subjected to intense gyrational or centrifugal forces, as in tumbling and spinning. Tumbling and spinning are a hazard to pilots who have been ejected from a moving aircraft.

      Tolerance levels to rotational stress depend somewhat upon which part of the body is acting as the centre of rotation and how long the stress is endured. When the heart is the centre of rotation, unconsciousness can occur at 169 revolutions per minute for only a 3- to 10-second exposure, and the results can be fatal if such rotation is sustained for two minutes. At 150 revolutions per minute the blood pressure is drastically lowered so that output from the heart is almost stopped. Hemorrhages can occur in the eyes, brain tissue, skin, sinus cavities, and middle ears; pain and severe headaches can be produced and may last for several days after the exposure. Other complications that can arise are nausea, vomiting, pooling of blood in the extremities, disorientation, and blurring of vision.

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Rotational molding — or moulding is a versatile process for creating many kinds of mostly hollow plastic parts. The phrase is often shortened to rotomolding or rotomoulding.The process was developed in the 1940s but in early years was used little because it was a… …   Wikipedia

  • Managed intensive rotational grazing — Management Intensive Rotational Grazing (MIRG) is a system of grazing in which ruminant and non ruminant herds are regularly and systematically moved to fresh pasture with the intent to maximize the quality and quantity of forage growth. MIRG can …   Wikipedia

  • Cyclic stress — in engineering refers to an internal distribution of forces (a stress) that changes over time in a repetitive fashion. As an example, consider one of the large wheels used to drive an aerial lift such as a ski lift. The wire cable wrapped around… …   Wikipedia

  • solids, mechanics of — ▪ physics Introduction       science concerned with the stressing (stress), deformation (deformation and flow), and failure of solid materials and structures.       What, then, is a solid? Any material, fluid or solid, can support normal forces.… …   Universalium

  • Marsh rice rat — Temporal range: Rancholabrean (300,000 years before present) – present Conservation status …   Wikipedia

  • Rotation around a fixed axis — Rotational motion can occur around more than one axis at once, and can involve phenomena such as wobbling and precession. Rotation around a fixed axis is a special case of rotational motion, which does not involve those phenomena. The kinematics… …   Wikipedia

  • Post-glacial rebound — A model of present day mass change due to post glacial rebound and the reloading of the ocean basins with seawater. Blue and purple areas indicate rising due to the removal of the ice sheets. Yellow and red areas indicate falling as mantle… …   Wikipedia

  • Einstein–Cartan theory — in theoretical physics extends general relativity to correctly handle spin angular momentum. As the master theory of classical physics general relativity has one known flaw: it cannot describe spin orbit coupling , i.e., exchange of intrinsic… …   Wikipedia

  • Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate …   Wikipedia

  • Rheometer — Today, a rheometer is a laboratory device used to measure the way in which a liquid, suspension or slurry flows in response to applied forces. It is used for those fluids which cannot be defined by a single value of viscosity and therefore… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”