stress (stres)

1. Reactions of the body to forces of a deleterious nature, infections, and various abnormal states that tend to disturb its normal physiologic equilibrium (homeostasis). 2. In dentistry, the forces set up in teeth, their supporting structures, and structures restoring or replacing teeth as a result of the force of mastication. 3. The force or pressure applied or exerted between portions of a body or bodies, generally expressed in pounds per square inch. 4. In rheology, the force in a material transmitted per unit area to adjacent layers. 5. In psychology, a physical or psychological stimulus such as very high heat, public criticism, or another noxious agent or experience which, when impinging upon an individual, produces psychological strain or disequilibrium. [L. strictus, tight, fr. stringo, to draw together]
life or experiences that produce severe strain, e.g., failure on the job, marital separation, loss of a love object.
shear s.the force acting in shear flow expressed per unit area; units in the CGS system: dynes/cm2.
tensile s.a s. acting on a body per unit cross-sectional area so as to elongate the body.
yield s.the critical s. that must be applied to a material before it begins to flow, as in a Bingham plastic.


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