Thermal Stress


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thermal stress

[′thər·məl ′stres]
(mechanics)
Mechanical stress induced in a body when some or all of its parts are not free to expand or contract in response to changes in temperature.

Thermal stress

A stress produced by thermal movement that is resisted by the building; if the thermal stresses are higher than the capacity of the materials to resist them, expansion or contraction joints are required.

Thermal Stress

 

(Russian, temperaturnoe napriazhenie), a stress produced in a body as a result of a nonuniform distribution of temperature in different parts of the body and some restriction on the possibility of thermal expansion or contraction imposed by adjacent parts of the body or by other bodies surrounding the body in question. An example of thermal stresses is the tensile stresses produced in a wire stretched between fixed supports as the wire is cooled. Thermal stresses can cause the failure of machine components, buildings, and structural members. Expansion joints and other means, including gaps between successive lengths of rails, gaps between the blocks of a dam, and rollers on bridge supports, are used to prevent such failures.

thermal stress, temperature stress

Stress introduced by uniform or nonuniform temperature change in a structure or material which is constrained against expansion or contraction.
References in periodicals archive ?
Schramek developed an algorithm to apply the accepted coral stress algorithms to depths that included the deeper mesophotic, typically thought to be a refuge from thermal stress.
The safety factor was approximately 2 by proportioning the yield strength to the value (400MPa) at which thermal stress intensified at 200[degrees]C.
This behaviour allowed us to establish a time interval following application of the thermal stress in which the temperature difference between the teeth with and without irrigation was greatest, thereby providing a clear evidence of the different thermal behaviours of the two types of teeth.
To test the effects of oxidative stress induced by [H.sub.2][O.sub.2] on Symbiodinium cells, a similar experimental design was used as in the thermal stress experiment, except that all tubes were kept at room temperature (26 [degrees]C [+ or -] 1 [degrees]C) in low light (50 [micro]mol photons [m.sup.-1] [s.sup.-1]) (n = 3 per treatment).
[[sigma].sup.th.sub.i] and [[sigma].sup.ch.sub.i] represent the thermal stress caused by temperature gradient and the chemical shrinkage stress induced by the curing reaction, respectively.
The coefficient of friction during progressive debonding is estimated by the ratio of tail force Fb tested by the results of microbond test (Figure 2) and the radial force caused by the residual thermal stress.
associated with the fire deck of cylinder heads: the deck should be as thin as possible to avoid critical thermal stresses during the low frequency thermal transients but sufficiently thick to avoid failures due to the high frequency combustion pressure.
In order to estimate stresses on the hole edges, the thermal stress concentration factor is calculated.
Figures 6 and 7 present the temperature profile and thermal stress analysis results, respectively.
Mathematical Description of Thermal Stress. A body will change its shape and/or volume when exposed to a temperature change [DELTA]T.
They discuss such aspects as thermal stress in ruminants: responses and strategies for alleviation, adaptive responses of rangeland livestock to manage water balance, impacts of toxic plants on the welfare of grazing livestock, neonatal mortality of farm livestock in extensive management systems, and the transport of livestock from extensive production systems.