Crack propagation in laminar ceramics

0337699 - ÚFM 2010 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Náhlík, Luboš - Šestáková, Lucie - Hutař, Pavel
Crack propagation in laminar ceramics.
Proceedings of the international conference on Crack Paths. Padua: University Padua, 2009 - (Atzori, B.; Carpinteri, A.; Pook, L.), s. 1041-1048
[Crack Paths 2009. Vicenza (IT), 23.09.2009-25.09.2009]
Grant CEP: GA AV ČR(CZ) KJB200410803; GA AV ČR 1QS200410502; GA ČR GA106/09/0279
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: laminar ceramics * crack bifurcation * material interface
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The contribution presented deals with crack propagation in ceramic laminates. The crack behaviour in ceramic laminate body under external loading is investigated. Strong residual stresses due to different coefficients of thermal expansion of individual material layers are taking into account in finite element calculations.The influence of thickness of laminate layers on crack propagation direction is estimated. The stepwise crack propagation path of the crack propagating through Al2O3-ZrO2 ceramic laminate is numerically estimated. The comparison of estimated crack path with experimental data is done and mutual good agreement is found. The resistance to crack propagation through laminate body depends on the level of crack deflection on material interfaces, thus the estimation of the crack propagation direction or generally of the crack path is necessary for determination of so-called apparent fracture toughness of the laminate.
Trvalý link: http://hdl.handle.net/11104/0181637