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Elastocaloric effect in rubber

Keywords:

V.V. Koledov – Dr.Sc. (Phys.-Math.), Leading Researcher, Kotelnikov IRE RAS E.V. Morozov – Leading Engineer, Kotelnikov IRE RAS V.G. Shavrov – Dr.Sc. (Phys.-Math.), Head of Laboratory, Kotelnikov IRE RAS


This paper is devoted to the experimental study of the elastocaloric effect (ECE) in rubber at the periodic action of the tensile force. The magnitude of ECE at an initial temperature of 30 °C, elongation of 550 % and a frequency of 0.2 Hz cycles was found to be 10 °C. With increasing frequency from 0.2 Hz to 4 Hz ECE falls by an order of magnitude, and the average temperature of the sample is rapidly increased to 45 °C. ECE arises because the stretched rubber has a smaller heat capacity than in the initial state, due to breaking of cross-links between polymer molecules coils under tension. The observed effects of self-heating and reduce of ECE are explained by the fact that at high frequency of stress-strain in the rubber polymer chains do not have time to restore the cross-links, in addition it increases the internal friction, which causes self-heating.
References:

 

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  3. Guyomar D., Li Y. et al. Elastocaloric modeling of natural rubber // Applied Thermal Engineering. 2013. V. 57. R. 33–38.

 

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