Project detail

Mechanical and fracture properties of multilayered ceramic/ceramic and ceramic/metal materials with graded layers

Duration: 01.01.2009 — 31.12.2012

Funding resources

Czech Science Foundation - Standardní projekty

- whole funder (2009-01-01 - 2012-12-31)

On the project

Podstata navrhovaného projektu (max. 1100 znaků) - česky Lamelární struktury vedou k významnému zvýšení houževnatosti materiálu v porovnání s jinými typy mikrostruktur. Tento efekt je způsoben tím, že lamelární struktury zvyšují účinnost mechanismů zhouževnatění a podporují vznik zbytkových napětí. Navzdory intenzivnímu výzkumu mechanických a lomových vlastností multilamelárních struktur typu keramika/keramika a keramika/kov, zbývá stále několik kritických problémů, které si zasluhují další výzkum.Stávající lomová kritéria a výpočty zbytkových napětí v multilamelárních strukturách nerespektují dostatečně materiálová rozhraní, povrchy a materiálové hrany, které vedou k singularitám ve fyzikálních polích. Jedním ze způsobů, jak zmírnit tyto efekty, je vytvoření spojitých změn v materiálovém složení jednotlivých vrstev, které odstraňují singularity ve fyzikálních polích a mohou dokonce vést ke stavu, kdy materiálové spoje nejsou podrobeny napětí.

Description in English
Lamellar structures provide significant increases in toughness over other microstructures. By layering different structural ceramic materials, the apparent fracture toughness can be increased through either enhancement of toughening mechanisms or residual stress effects. The state of knowledge regarding the mechanical and fracture properties of multilayers has increased greatly within the last decade, but there remain several critical areas in need of further research. Available residual stressesand fracture criteria refer to conditions far from surfaces or edges. This is an important distinction, since pronounced edge effects are known to exist in displacement, stress, temperature, magnetic, and electrical fields. One of the ways to reconcile the edge and/or interface effects is the introduction of gradual compositional changes into individual layers which removes large-scale interface-induced stress singularities and can even result in stress-free material joints.

Keywords
keramika, multilamelární struktury, lomová houževnatost, modelování, teplotní zbytkové napětí

Key words in English
ceramics; multilayers; fracture toughness; modelling; thermal residual stresses

Mark

GA101/09/1821

Default language

Czech

People responsible

Dlouhý Ivo, prof. Ing., CSc. - fellow researcher
Kotoul Michal, prof. RNDr., DrSc. - principal person responsible

Units

Institute of Solid Mechanics, Mechatronics and Biomechanics
- beneficiary (2009-01-01 - 2012-12-31)

Results

PROFANT, T.; KLUSÁK, J.; KOTOUL, M.; KNÉSL, Z. Application of the generalized linear elastic fracture mechanics to NiTi catheter. Brazílie: SBPMat, 2009. p. 1 (1 s.).
Detail

KLUSÁK, J.; PROFANT, T.; KNÉSL, Z.; KOTOUL, M. The influence of discontinuity and orthotropy of fracture toughness on conditions of fracture initiation in singular stress concentrators. Engineering Fracture Mechanics, 2013, vol. 110, no. 2013, p. 438-447. ISSN: 0013-7944.
Detail

ŘEHOŘEK, L.; DLOUHÝ, I.; CHLUP, Z. Vliv povlaku na lomové chování keramických pěn pří tahovém zatěžování. In KŘEHKÝ LOM 2010 sborník semináře Design a porušování materiálů. Design a porušování materiálů. Brno: Ústav fyziky materiálů AV ČR, v.v.i., 2010. s. 157-170. ISBN: 978-80-87434-01-7.
Detail

KLUSÁK, J.; PROFANT, T.; KOTOUL, M. Study of stress distribution around an orthotropic bi-material notch tip. Key Engineering Materials (print), 2009, vol. 417-418, no. 1, p. 385-388. ISSN: 1013-9826.
Detail

KOTOUL, M.; VYSLOUŽIL, T. Numerical modelling of crack propagation and R-curve behaviour in layered Al2O3/ZrO2 composites. Key Engineering Materials (print), 2009, vol. 417-418, no. 1, p. 769-772. ISSN: 1013-9826.
Detail

KOTOUL, M.; ŠEVEČEK, O.; PROFANT, T. Analysis of multiple cracks in thin coating on orthotropic substrate under mechanical and residual stresses. Engineering Fracture Mechanics, 2009, vol. 77, no. 2, p. 229-248. ISSN: 0013-7944.
Detail

ŘEHOŘEK, L.; DLOUHÝ, I.; CHLUP, Z. Tensile behaviour of open cell ceramic foams. Ceramics-Silikáty, 2009, vol. 53, no. 4, p. 237-241. ISSN: 0862-5468.
Detail

NÁHLÍK, L.; ŠESTÁKOVÁ, L.; HUTAŘ, P.; BERMEJO, R. Prediction of crack propagation in layered ceramics with strong interfaces. Engineering Fracture Mechanics, 2010, vol. 77, no. 11, p. 2192-2199. ISSN: 0013-7944.
Detail

KOTOUL, M.; VYSLOUŽIL, T. Effect of Elastic Mismatch and Anisotropy on Cracking of Brittle Films on Elastic Substrates. Key Engineering Materials (print), 2011, vol. 465, no. 1, p. 235-238. ISSN: 1013-9826.
Detail

DLOUHÝ, I.; BOCCACCINI, A.; KOCH, D.; LEE, W.; HORVATH, J.; DESIMONE, D. Optically-transparent oxide fibre-reinforced glasss matrix composites. Journal of Non-Crystaline Solids, 2010, vol. 356, no. 6, p. 2591-2597. ISSN: 0022-3093.
Detail

CHLUP, Z.; FLAŠAR, P.; DLOUHÝ, I. Response of inherently brittle materials on higher loading rates. Engineering Fracture Mechanics, 2010, vol. 77, no. 2, p. 359-366. ISSN: 0013-7944.
Detail

NÁHLÍK, L.; ŠESTÁKOVÁ, L.; HUTAŘ, P.; KNÉSL, Z. Generalized linear elastic fracture mechanics: an application to a crack touching the bimaterial interface. Key Engineering Materials (print), 2011, vol. 452-453, no. XXX, p. 445-448. ISSN: 1013-9826.
Detail

MARCIÁN, P.; MAJER, Z.; ŘEHOŘEK, L.; FLORIAN, Z.; DLOUHÝ, I. Chapter 47: Estimation of the properties porous structures by experiment and modelling. In DAAAM International Scientific Book 2011. 10. Vienna: DAAAM International Vienna, 2011. p. 573-584. ISBN: 978-3-901509-84-1.
Detail

KOTOUL, M.; ŠEVEČEK, O.; PROFANT, T. Modelling of Crack Bifurcation in Laminar Ceramics with Large Compressive Stress. Key Engineering Materials (print), 2012, vol. 488-489, no. 2012, p. 130-133. ISSN: 1013-9826.
Detail

DAMBORSKÝ, P.; PROFANT, T.; KOTOUL, M. STRESS SINGULARITY ANALYSIS OF CRACKS LYING ON THE INTERFACE BETWEEN TWO ORTHOTROPIC MATERIALS. In ENGINEERING MECHANICS. 1. Prague: Institute of Thermomechanics - Academy of Sciences of the Czech Republic - Prague, 2011. p. 103-107. ISBN: 978-80-87012-33-8.
Detail

MARCIÁN, P.; MAJER, Z.; FLORIAN, Z.; DLOUHÝ, I. Stress Strain Analysis of High Porous Ceramics. Advanced Materials Research, 2012, vol. 482-484, no. 1, p. 1330-1333. ISSN: 1022-6680.
Detail

ŠEVEČEK, O.; KOTOUL, M.; PROFANT, T. Effect of higher order asymptotic terms on the competition between crack penetration and debond at a bimaterial interface between aligned orthotropic materials. Engineering Fracture Mechanics, 2012, vol. 80, no. 1, p. 28-51. ISSN: 0013-7944.
Detail

JURČI, P.; DLOUHÝ, I. Coating of Cr–V ledeburitic steel with CrN containing a small addition of Ag. Applied Surface Science, 2011, vol. 257, no. 24, p. 10581-10589. ISSN: 0169-4332.
Detail

MAJER, Z.; MARCIÁN, P.; DLOUHÝ, I.; FLORIAN, Z.; ŘEHOŘEK, L.; MALINA, R. Computational modeling of highly porous materials with application in biomechanics. In Computer Methods in Biomechanics and Biomedical Engineering 2012. Berlín: British Library Cataloguing in Publication Data, 2012. p. 916-921. ISBN: 978-0-9562121-5-3.
Detail

ŠEVČÍK, M.; HUTAŘ, P.; KNÉSL, Z.; NÁHLÍK, L.; ZOUHAR, M. Estimation of the critical configuration of a crack arrested at the interface between two materials. COMPUTATIONAL MATERIALS SCIENCE, 2012, vol. 64, no. 5, p. 225-228. ISSN: 0927-0256.
Detail

MARCIÁN, P.; MAJER, Z.; DLOUHÝ, I.; FLORIAN, Z. Estimation of Local Mechanical Properties of Highly Porous Ceramic Materials. Chemické listy, 2012, vol. 106, no. 1, p. 476-477. ISSN: 0009-2770.
Detail

ŠEVEČEK, O.; BERMEJO, R.; KOTOUL, M. Crack path prediction in layered ceramics designed with residual stresses. In Proceedings of the 4th International Conference on CRACK PATHS (CP 2012). 2012. p. 87-98. ISBN: 9788895940441.
Detail

KOTOUL, M.; ŠEVEČEK, O.; VYSLOUŽIL, T. Crack Growth in Ceramic Laminates with Strong Interfaces and Large Compressive Residual Stresses. Theoretical and Applied Fracture Mechanics, 2012, vol. 2012 (61), no. 1, p. 40-50. ISSN: 0167-8442.
Detail

NÁHLÍK, L.; HUTAŘ, P.; ŠEVČÍK, M.; MALÍKOVÁ, L. Determination of crack propagation direction using approach based on generalized linear elastic fracture. In The 4th International Conference on Crack Paths (CP2012). 2012. p. 1065-1072. ISBN: 9788895940441.
Detail

BERTOLLA, L.; DLOUHÝ, I.; ŘEHOŘEK, L.; CHLUP, Z. Tensile properties of open cell ceramic foams. Acta metalurgica slovaca, 2013, vol. 2013(3), no. 1, p. 106-113. ISSN: 1338-1660.
Detail

PROFANT, T.; KLUSÁK, J.; ŠEVEČEK, O.; HRSTKA, M.; KOTOUL, M. An energetic criterion for a micro-crack of finite length initiated in orthotropic bi-material notches. Engineering Fracture Mechanics, 2013, vol. 110, no. 2013, p. 396-409. ISSN: 0013-7944.
Detail

KOTOUL, M.; PROFANT, T.; ŠEVEČEK, O.; KLUSÁK, J. Computational model of the transition of crack across the sharp material interface. In 12th International Conference on Fracture. 2009. p. 1-10. ISBN: 9781617382277.
Detail

Responsibility: Kotoul Michal, prof. RNDr., DrSc.