Publication detail
An evaluation of the stress intensity factor in functionally graded materials
ŠEVČÍK, M. HUTAŘ, P. NÁHLÍK, L. KNÉSL, Z.
Czech title
Stanovení součinitele intenzity napětí ve funkčně gradientních materiálech
English title
An evaluation of the stress intensity factor in functionally graded materials
Type
journal article - other
Language
en
Original abstract
Functionally graded materials (FGM) are characterised by variations in their material properties in terms of their geometry. They are often used as a coating for interfacial zones to protect the basic material against thermally or mechanically induced stresses. FGM can be also produced by technological process for, example butt-welding of polymer pipes. This work is focused on a numerical estimation of the stress intensity factor for cracks propagat-ing through FGM structure. The main difficulty of the FE model creation is the accurate description of continual changes in mechanical properties. An analysis of the FGM layer bonded from both sides with different homoge-nous materials was performed to study the influence of material property distribution. The thickness effect of the FGM layer is also discussed. All analyses are simulated as a 2D problem of an edge crack specimen. In this pa-per, the above effects are quantified and conclusions concerning the applicability of the proposed model are dis-cussed.
Czech abstract
Tato práce je zaměřena na numerický odhad součinitele intenzity napětí pro trhliny šířící se skrze funkčně gradientní strukturu. Hlavní obtížnost numerické simulace je dobrý popis gradientní změny mechanických vlastností. V práci je modelována gradientní vrstva mezi dvěma homogenními materiály a studován charakter změny mechanických vlastností z materiálu 1 do materiálu 2. Vliv tloušťky vrstvy je zde diskutován. Simulace jsou provedeny na 2D modelu pomocí metody konečných prvků.
English abstract
Functionally graded materials (FGM) are characterised by variations in their material properties in terms of their geometry. They are often used as a coating for interfacial zones to protect the basic material against thermally or mechanically induced stresses. FGM can be also produced by technological process for, example butt-welding of polymer pipes. This work is focused on a numerical estimation of the stress intensity factor for cracks propagat-ing through FGM structure. The main difficulty of the FE model creation is the accurate description of continual changes in mechanical properties. An analysis of the FGM layer bonded from both sides with different homoge-nous materials was performed to study the influence of material property distribution. The thickness effect of the FGM layer is also discussed. All analyses are simulated as a 2D problem of an edge crack specimen. In this pa-per, the above effects are quantified and conclusions concerning the applicability of the proposed model are dis-cussed.
Keywords in Czech
funkčně gradientní materiál; lineárně elastická lomová mechanika; diskretizašní postup; mocninná změna materiálových vlastností
Keywords in English
functionally graded material; linear elastic fracture mechanics; discretization methodology; power-law material change
RIV year
2009
Released
28.12.2009
Publisher
University of West Bohemia
Location
Plzeň
ISSN
1802-680X
Journal
Applied and Computational Mechanics
Volume
3
Number
2
Pages from–to
401–410
Pages count
10
BIBTEX
@article{BUT47439,
author="Martin {Ševčík} and Pavel {Hutař} and Luboš {Náhlík} and Zdeněk {Knésl},
title="An evaluation of the stress intensity factor in functionally graded materials",
journal="Applied and Computational Mechanics",
year="2009",
volume="3",
number="2",
month="December",
pages="401--410",
publisher="University of West Bohemia",
address="Plzeň",
issn="1802-680X"
}