Publication detail
Prediction of the ceramic foam structure failure using a detailed finite element model
ŠEVEČEK, O. HANÁK, J. MAJER, Z. DRDLÍK, D. CHLUP, Z. KOTOUL, M.
English title
Prediction of the ceramic foam structure failure using a detailed finite element model
Type
conference paper
Language
en
Original abstract
The contribution deals with modelling and prediction of failure of mechanically loaded open cell ceramic foam structures by using 3D volume FE models constructed from CT scans of real foam specimens. The condition for crack initiation in particular struts comes from the coupled stress-energy criterion which combines two fracture-mechanics parameters of the investigated material – tensile strength and its fracture toughness. By combining of both stress and energy condition one obtains information about the crack initiation length which is later used (together with the tensile strength) for determination of the strut failure in the complex 3D FE model of the ceramic foam structure. The crack onset is considered in the critical location at the moment when the (tensile) principal stress under the strut surface (in a depth corresponding to the crack initiation length) exceeded the tensile strength of the strut. Such approach enables us to define failure also on relatively coarse meshes of the FE models where potential stress concentrations are not described precisely and therefore it is not possible to decide about the failure just based upon the value of tensile stress on the strut surface.
English abstract
The contribution deals with modelling and prediction of failure of mechanically loaded open cell ceramic foam structures by using 3D volume FE models constructed from CT scans of real foam specimens. The condition for crack initiation in particular struts comes from the coupled stress-energy criterion which combines two fracture-mechanics parameters of the investigated material – tensile strength and its fracture toughness. By combining of both stress and energy condition one obtains information about the crack initiation length which is later used (together with the tensile strength) for determination of the strut failure in the complex 3D FE model of the ceramic foam structure. The crack onset is considered in the critical location at the moment when the (tensile) principal stress under the strut surface (in a depth corresponding to the crack initiation length) exceeded the tensile strength of the strut. Such approach enables us to define failure also on relatively coarse meshes of the FE models where potential stress concentrations are not described precisely and therefore it is not possible to decide about the failure just based upon the value of tensile stress on the strut surface.
Keywords in English
Ceramic foam;Coupled criterion;Crack;FE model;FEM;Finite Fracture Mechanics
Released
01.02.2020
Publisher
Trans Tech Publications Ltd
Location
Švýcarsko
ISBN
9783035715866
ISSN
1013-9826
Book
Advances in Fracture and Damage Mechanics XVIII
Volume
1
Number
827
Edition number
1
Pages from–to
222–227
Pages count
6
BIBTEX
@inproceedings{BUT163776,
author="Oldřich {Ševeček} and Jiří {Hanák} and Zdeněk {Majer} and Daniel {Drdlík} and Zdeněk {Chlup} and Michal {Kotoul},
title="Prediction of the ceramic foam structure failure using a detailed finite element model",
booktitle="Advances in Fracture and Damage Mechanics XVIII",
year="2020",
volume="1",
number="827",
month="February",
pages="222--227",
publisher="Trans Tech Publications Ltd",
address="Švýcarsko",
isbn="9783035715866",
issn="1013-9826"
}