Thermal conductivity and Young's modulus of cubic-cell metamaterials

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43919519" target="_blank" >RIV/60461373:22310/19:43919519 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/journal/ceramics-international/vol/45/issue/1?page=2" target="_blank" >https://www.sciencedirect.com/journal/ceramics-international/vol/45/issue/1?page=2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ceramint.2018.09.271" target="_blank" >10.1016/j.ceramint.2018.09.271</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal conductivity and Young's modulus of cubic-cell metamaterials

Popis výsledku v původním jazyce

It is shown that the popular quasi-laminate solutions for the relative (thermal) conductivity of cellular materials with cubic cells (closed or open) are in conflict with the upper Hashin-Shtrikman bound and thus inadmissible. However, numerical modeling can be used to estimate the porosity dependence of conductivity and leads to results that are below the upper Hashin-Shtrikman bound, as required for cubic and isotropic materials. The numerical results predict differences of up to 0.073 relative property units (RPU) between closed- and open-cell materials. For porosities approaching 100%, i.e. infinitely thin walls, both the analytical and the numerical solution for closed cubic cells approach the upper Hashin-Shtrikman bound. Moreover, the porosity dependence of the relative conductivity for closed cubic cells is very close to the upper Hashin-Shtrikman bound in the whole range of porosities and is correlated to the relative Young modulus via a cross-property relation based on the Hashin-Shtrikman bounds.

Název v anglickém jazyce

Thermal conductivity and Young's modulus of cubic-cell metamaterials

Popis výsledku anglicky

It is shown that the popular quasi-laminate solutions for the relative (thermal) conductivity of cellular materials with cubic cells (closed or open) are in conflict with the upper Hashin-Shtrikman bound and thus inadmissible. However, numerical modeling can be used to estimate the porosity dependence of conductivity and leads to results that are below the upper Hashin-Shtrikman bound, as required for cubic and isotropic materials. The numerical results predict differences of up to 0.073 relative property units (RPU) between closed- and open-cell materials. For porosities approaching 100%, i.e. infinitely thin walls, both the analytical and the numerical solution for closed cubic cells approach the upper Hashin-Shtrikman bound. Moreover, the porosity dependence of the relative conductivity for closed cubic cells is very close to the upper Hashin-Shtrikman bound in the whole range of porosities and is correlated to the relative Young modulus via a cross-property relation based on the Hashin-Shtrikman bounds.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GA18-17899S" target="_blank" >GA18-17899S: Částečně a plně slinutá keramika - příprava, mikrostruktura, vlastnosti, modelování a teorie slinování</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ceramics International

ISSN

0272-8842

e-ISSN

—

Svazek periodika

45

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

954-962

Kód UT WoS článku

000452570300120

EID výsledku v databázi Scopus

—