Crack Behaviour in Laminar Ceramics with Strong Interfaces

0354085 - ÚFM 2011 RIV CH eng J - Článek v odborném periodiku
Náhlík, Luboš - Šestáková, Lucie - Hutař, Pavel
Crack Behaviour in Laminar Ceramics with Strong Interfaces.
Key Engineering Materials. Roč. 417-418, - (2010), s. 301-304. ISSN 1013-9826
Grant CEP: GA AV ČR(CZ) KJB200410803; GA ČR GA106/09/0279
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: ceramic laminate * crack propagation direction * residual stress * flaw tolerant ceramic
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The paper deals with crack propagation in ceramic laminates. Assumptions of linear elastic fracture mechanics and small scale yielding are considered. Crack behaviour in a ceramic laminate body under external loading is investigated. Strong residual stresses due to different coefficients of thermal expansion of individual material layers are taken into account in finite element calculations. The change of crack propagation direction at the material interface is estimated on the base of the strain energy density factor and maximum tangential stress criteria. The influence of thickness of laminate layers on crack propagation direction is estimated. The stepwise crack propagation through the Al2O3-ZrO2 ceramic laminate is numerically estimated. It can be concluded that good agreement between the estimated crack path and experimental data was found.
Trvalý link: http://hdl.handle.net/11104/0193164