Comparison of direct and indirect measurement of the elastocaloric effect in natural rubber

Abstract : The directly measured temperature change Δ T upon deformation (elastocaloric effect) of natural rubber was compared with indirect method, which is deduced from the Clausius-Clapeyron factor (σ / T) ε, where σ is the stress and ε is the strain. The factor (σ / T) ε can be measured by two different methods. One is to measure the stress vs. strain behavior at different static temperatures. It is found that the Δ T deduction is underestimated or even of opposite sign compared with the directly measured one. These behaviors are different from elastocaloric effect of shape memory alloys. An interpretation based on strain-induced crystallite is proposed. The other characterization is to measure the stress vs. temperature at constant strain. It results in a prediction, which is in good quantitative agreement with the directly measured one. The stress appears then to be a non-state variable, thus questioning the ergodicity of the material. © 2016 AIP Publishing LLC.
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Z. Xie, G. Sebald, D. Guyomar. Comparison of direct and indirect measurement of the elastocaloric effect in natural rubber. Applied Physics Letters, American Institute of Physics, 2016, 108 (4), ⟨10.1063/1.4940378⟩. ⟨hal-01769140⟩

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