Numerical simulation on effects of pore characteristics on strength in porous ceramics

Porous ceramics are expected to be applied as filters, catalysts, etc. in energy related structures, because they have higher heat-resistance and larger specific surface area. Even for such functional applications, their strength should be adequately evaluated to guarantee long-term durability with...

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Autores principales:	Natsumi MIYAZAKI, Yusuke OMOTO, Toshihiko HOSHIDE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	ceramics porosity bending strength pore characteristics fracture mechanics numerical simulation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/86e9a1bfcc1e486a8a55fcada3eeea6d
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spelling	oai:doaj.org-article:86e9a1bfcc1e486a8a55fcada3eeea6d2021-11-29T05:47:04ZNumerical simulation on effects of pore characteristics on strength in porous ceramics2187-974510.1299/mej.19-00234https://doaj.org/article/86e9a1bfcc1e486a8a55fcada3eeea6d2019-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/5/6_19-00234/_pdf/-char/enhttps://doaj.org/toc/2187-9745Porous ceramics are expected to be applied as filters, catalysts, etc. in energy related structures, because they have higher heat-resistance and larger specific surface area. Even for such functional applications, their strength should be adequately evaluated to guarantee long-term durability with fulfilling the required functions. However, it is very difficult to investigate strength for porous ceramics with various pore characteristics experimentally. In this work, an analytical procedure was proposed for estimating strength in porous ceramics by taking account of the pore characteristics, such as porosity, pore density and pore radius. In the procedure, porous ceramics were assumed to have the same characteristics of crack distribution as those of pore distribution, and pores were presumed to be surrounded by virtual cracks. For several materials with different pore characteristics, numerical simulations based on the proposed procedure were carried out to estimate their strength and to clarify effects of pore characteristics on strength. It was reconfirmed that the strength of porous ceramics had a general tendency to decrease drastically as increasing porosity. It was also revealed that the strength of porous ceramics were affected by porosity, pore density and average pore radius, respectively. Based on the simulated results, it was suggested that porous ceramics with higher strength can be obtained by including many small pores in producing porous ceramics with a predetermined bulk porosity. In other words, for porous ceramics with the same bulk porosity, various strength characteristics can be attained by controlling the pore size.Natsumi MIYAZAKIYusuke OMOTOToshihiko HOSHIDEThe Japan Society of Mechanical Engineersarticleceramicsporositybending strengthpore characteristicsfracture mechanicsnumerical simulationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 5, Pp 19-00234-19-00234 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	ceramics porosity bending strength pore characteristics fracture mechanics numerical simulation Mechanical engineering and machinery TJ1-1570
spellingShingle	ceramics porosity bending strength pore characteristics fracture mechanics numerical simulation Mechanical engineering and machinery TJ1-1570 Natsumi MIYAZAKI Yusuke OMOTO Toshihiko HOSHIDE Numerical simulation on effects of pore characteristics on strength in porous ceramics
description	Porous ceramics are expected to be applied as filters, catalysts, etc. in energy related structures, because they have higher heat-resistance and larger specific surface area. Even for such functional applications, their strength should be adequately evaluated to guarantee long-term durability with fulfilling the required functions. However, it is very difficult to investigate strength for porous ceramics with various pore characteristics experimentally. In this work, an analytical procedure was proposed for estimating strength in porous ceramics by taking account of the pore characteristics, such as porosity, pore density and pore radius. In the procedure, porous ceramics were assumed to have the same characteristics of crack distribution as those of pore distribution, and pores were presumed to be surrounded by virtual cracks. For several materials with different pore characteristics, numerical simulations based on the proposed procedure were carried out to estimate their strength and to clarify effects of pore characteristics on strength. It was reconfirmed that the strength of porous ceramics had a general tendency to decrease drastically as increasing porosity. It was also revealed that the strength of porous ceramics were affected by porosity, pore density and average pore radius, respectively. Based on the simulated results, it was suggested that porous ceramics with higher strength can be obtained by including many small pores in producing porous ceramics with a predetermined bulk porosity. In other words, for porous ceramics with the same bulk porosity, various strength characteristics can be attained by controlling the pore size.
format	article
author	Natsumi MIYAZAKI Yusuke OMOTO Toshihiko HOSHIDE
author_facet	Natsumi MIYAZAKI Yusuke OMOTO Toshihiko HOSHIDE
author_sort	Natsumi MIYAZAKI
title	Numerical simulation on effects of pore characteristics on strength in porous ceramics
title_short	Numerical simulation on effects of pore characteristics on strength in porous ceramics
title_full	Numerical simulation on effects of pore characteristics on strength in porous ceramics
title_fullStr	Numerical simulation on effects of pore characteristics on strength in porous ceramics
title_full_unstemmed	Numerical simulation on effects of pore characteristics on strength in porous ceramics
title_sort	numerical simulation on effects of pore characteristics on strength in porous ceramics
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/86e9a1bfcc1e486a8a55fcada3eeea6d
work_keys_str_mv	AT natsumimiyazaki numericalsimulationoneffectsofporecharacteristicsonstrengthinporousceramics AT yusukeomoto numericalsimulationoneffectsofporecharacteristicsonstrengthinporousceramics AT toshihikohoshide numericalsimulationoneffectsofporecharacteristicsonstrengthinporousceramics
_version_	1718407597964394496

Numerical simulation on effects of pore characteristics on strength in porous ceramics

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