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Temperature Stress

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thermal stress, temperature stress
Stress introduced by uniform or nonuniform temperature change in a structure or material which is constrained against expansion or contraction.

Temperature Stress 

(Russian, termicheskoe napriazhenie), a stress caused by a change in the thermal state of a body upon heating, cooling, or prolonged exposure to elevated or low temperatures. For example, the hardening of steel parts produces temperature stresses. In this case the temperature stresses are a combination of the stresses resulting from the change in the specific volume of steel that has undergone martensitic transformation during hardening and the thermal stresses caused by quenching. The effect of temperature stresses—for example, fracture or cracking during hardening—may not be apparent during quenching but may take some time, even several days, to develop as a result of a gradual stress buildup caused by changes in the specific volumes of structural members.



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[FIGURE 1 OMITTED] The output of this machine combination is based on screen fineness and maximum possible temperature stress of the compound.
As a consequence of the temperature stress, the cross-linking degree and the tear resistance and adhesion of the ink increase; if the temperature stress is too high a very strong adhesion results, leading to a loss in peelability and in extreme cases even to a kind of charring of the ink as seen in FIGURE 4.
Therefore, it is possible to set low oven temperatures, which reduces temperature stress on components, especially for Pb-free soldering.
 
 
 
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