Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 116, Issue -, Pages 350-369Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2018.04.003
Keywords
Natural rubber; Analytical network-averaging; Phase transition; Crystallization kinetics; Gough Joule effect; Calorimetric effect
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In this contribution, we extend the analytical network-averaging concept (Khiem and Itskov, 2016) to phase transition during strain-induced crystallization of natural rubber. To this end, a physically-based constitutive model describing the nonisothermal strain-induced crystallization is proposed. Accordingly, the spatial arrangement of polymer sub networks is driven by crystallization nucleation and consequently alters the mesoscopic deformation measures. The crystallization growth is elucidated by diffusion of chain segments into crystal nuclei. The crystallization results in a change of temperature and an evolution of heat source. By this means, not only the crystallization kinetics but also the Gough-Joule effect are thoroughly described. The predictive capability of the constitutive model is illustrated by comparison with experimental data for natural rubbers undergoing strain-induced crystallization. All measurable values such as stress, crystallinity and heat source are utilized for the comparison. (C) 2018 Elsevier Ltd. All rights reserved.
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