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Stress resulting from uneven contraction during cooling of metals and ceramics due to uneven temperature distribution.



Related Terms

BRITTLE TEMPERATURE

The temperature point below which a material, especially metal, is brittle; that is, the critical normal stress for fracture is reached before the critical shear stress for plastic deformation.

LOAD CALCULATIONS

Determine the amount of heat or cooling that is required to maintain a constant temperature in a building.

COOLING POWER

A parameter devised to measure the air's cooling effect upon a human body; it is determined by the amount of heat required by a device to maintain the device at a constant temperature (usually 34 C); the entire system should be made to correspond, as closely as possible, to the external heat exchange mechanism of the human body.

THERMAL SHOCK

The development of a steep temperature gradient and accompanying high stress within a material or structure.

MEAN STRESS

  1. The algebraic mean of mean stress mean temperature difference the maximum and minimum values of a periodically varying stress. 2. See octahedral normal stress.

APPROACH

The difference between the temperature of the water leaving a cooling tower and the wet-bulb temperature of the surrounding air.

RADIATION FOG

A major type of fog, produced over land when radiational cooling reduces the temperature to or below its dew point. Radiation fog is a nighttime occurrence although it may begin to form by evening twilight and often does not dissipate until aft sunrise.

WET-BULB TEMPERATURE

The lowest temperature to which air can be cooled at any given time by evaporating water into it at constant pressure, when the heat required for evaporation is supplied by the cooling of the air. This temperature is indicated by a well-ventilated wet-bulb thermometer. See also FREE-AIR TEMPERATURE.

COOLING CURVE COOLING CURVE

A curve obtained by plotting time against temperature for a solidliquid mixture cooling under constant conditions.

SUBCOOLING

The process of cooling a liquid to a temperature below its saturation temperature for any given saturation pressure.

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