Young's modulus and thermal conductivity of model materials with convex or concave pores - from analytical predictions to numerical results

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916700" target="_blank" >RIV/60461373:22310/18:43916700 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0955221918300682" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0955221918300682</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2018.01.040" target="_blank" >10.1016/j.jeurceramsoc.2018.01.040</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Young's modulus and thermal conductivity of model materials with convex or concave pores - from analytical predictions to numerical results

Popis výsledku v původním jazyce

The effective Young&apos;s modulus and thermal conductivity of porous materials can be rigorously bounded from above via micromechanical bounds (upper Wiener Paul bounds and upper Hashin Shtrikman bounds), and several model relations are commonly used as tentative approximate predictions (Maxwell-type, Coble-Kingery-type, power-law and exponential relations). Based on numerical calculations on computer-generated digital model microstructures, both periodic and random, it is shown that these model relations provide rough approximations that are more or less appropriate for microstructures with essentially convex pores, but are not suitable for microstructures with concave pores. On the other hand, the Pabst Gregorova cross-property relation provides a very accurate (better than 0.04 relative property units) analytical prediction for the relative Young&apos;s modulus of isotropic porous materials with isometric pores, both convex and concave, when the relative thermal conductivity is known. It is shown that this cross-property relation is the best prediction currently available for isotropic porous materials with isometric pores.

Název v anglickém jazyce

Young's modulus and thermal conductivity of model materials with convex or concave pores - from analytical predictions to numerical results

Popis výsledku anglicky

The effective Young&apos;s modulus and thermal conductivity of porous materials can be rigorously bounded from above via micromechanical bounds (upper Wiener Paul bounds and upper Hashin Shtrikman bounds), and several model relations are commonly used as tentative approximate predictions (Maxwell-type, Coble-Kingery-type, power-law and exponential relations). Based on numerical calculations on computer-generated digital model microstructures, both periodic and random, it is shown that these model relations provide rough approximations that are more or less appropriate for microstructures with essentially convex pores, but are not suitable for microstructures with concave pores. On the other hand, the Pabst Gregorova cross-property relation provides a very accurate (better than 0.04 relative property units) analytical prediction for the relative Young&apos;s modulus of isotropic porous materials with isometric pores, both convex and concave, when the relative thermal conductivity is known. It is shown that this cross-property relation is the best prediction currently available for isotropic porous materials with isometric pores.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GA15-18513S" target="_blank" >GA15-18513S: Příprava a charakterizace oxidové a silikátové keramiky s řízenou mikrostrukturou a modelování souvislostí mezi mikrostrukturou a vlastnostmi</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of the European Ceramic Society

ISSN

0955-2219

e-ISSN

—

Svazek periodika

38

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

2694-2707

Kód UT WoS článku

000430647800003

EID výsledku v databázi Scopus

2-s2.0-85041607958