Determination of crack propagation direction using approach based on generalized linear elastic fracture

0387895 - ÚFM 2013 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Náhlík, Luboš - Hutař, Pavel - Ševčík, Martin - Šestáková, L.
Determination of crack propagation direction using approach based on generalized linear elastic fracture.
Proceedings of the 4th International Conference on Crack Paths (CP 2012). Parma: University of Parma, 2012 - (Carpinteri, A.; Iacoviello, F.; Pook, L.; Susmel, L.), s. 1065-1072. ISBN 9788895940441. ISSN 2281-1060.
[Crack paths 2012. Gaeta (IT), 19.09.2012-21.09.2012]
Grant CEP: GA MŠMT(CZ) ED1.1.00/02.0068; GA ČR GA101/09/1821
Institucionální podpora: RVO:68081723
Klíčová slova: material interface * generalized fracture mechanics * crack propagation direction * FEM modelling
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The objective of the paper is to investigate the direction of a further crack propagation from the interface between two elastic materials. The angle of crack propagation changes when the crack passes the interface, due to different material properties of layers. The suggested procedure makes it possible to estimate an angle of crack propagation under which the crack will propagate into the second material. The assumptions of (generalized) linear elastic fracture mechanics, which takes into account stress singularity exponent different from 1/2 are considered. The finite element method was used for numerical calculations. As an example application of the suggested approach on crack propagation through laminar ceramics (residual stresses in individual layers are taken into account) is introduced and results obtained compared with experimental data. The results obtained might contribute to a better understanding of the failure of materials with interfaces (e.g. layered composites, materials with protective coatings) and to a more reliable estimation of the service life of such structures.
Trvalý link: http://hdl.handle.net/11104/0216760