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Article

Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation

1
Institut P’, CNRS—Université de Poitiers—ISAE-ENSMA, 11 bd Marie et Pierre Curie, TSA 41123, CEDEX 09, 86073 Poitiers, France
2
Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SA2I/LIE, Cadarache, 13115 St Paul Lez Durance, France
*
Author to whom correspondence should be addressed.
Materials 2020, 13(22), 5258; https://doi.org/10.3390/ma13225258
Received: 5 November 2020 / Revised: 16 November 2020 / Accepted: 17 November 2020 / Published: 20 November 2020
Reliable predictions from numerical simulations in fire safety applications require knowledge of the combustible materials’ properties in their initial and thermally degraded states. The thermal conductivity of the sheath material of electrical cables, present in massive amounts in industrial plants, is addressed here. An evolutive conceptual model is proposed for the morphology of this intumescent polymer composite during its thermal degradation. It accounts for the multiscale structure and anisotropy observed during a thorough characterization based on tomographic images of samples at representative stages of the degradation. The evolution of the geometrical characteristics during the process is linked to chemical advancement parameters according to a reasoned scenario based on physical arguments and balance considerations. The anisotropic thermal conductivity tensor can be deduced from the geometry by a nested application of classical models. Ultimately, the conductivity is obtained as an analytic function of the chemical advancement and temperature. The model predictions were validated by comparisons with direct numerical solutions of thermal problems in the fully described geometry provided by the tomographies, and with measurements from the literature. The methodology and conceptual tools can be of interest for the treatment of other materials and in other contexts of application. View Full-Text
Keywords: intumescent polymer; composite; thermal degradation; morphology; thermal conductivity; conceptual modeling; tomography; upscaling intumescent polymer; composite; thermal degradation; morphology; thermal conductivity; conceptual modeling; tomography; upscaling
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MDPI and ACS Style

Shi, J.; Boyer, G.; Mourzenko, V.; Thovert, J.-F. Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation. Materials 2020, 13, 5258. https://doi.org/10.3390/ma13225258

AMA Style

Shi J, Boyer G, Mourzenko V, Thovert J-F. Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation. Materials. 2020; 13(22):5258. https://doi.org/10.3390/ma13225258

Chicago/Turabian Style

Shi, Jianwei, Germain Boyer, Valeri Mourzenko, and Jean-François Thovert. 2020. "Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation" Materials 13, no. 22: 5258. https://doi.org/10.3390/ma13225258

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