Prediction of the Traction Separation Law of Ceramics Using Iterative Finite Element Modelling

0474235 - ÚFM 2018 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
Kozák, Vladislav - Chlup, Zdeněk - Padělek, P. - Dlouhý, Ivo
Prediction of the Traction Separation Law of Ceramics Using Iterative Finite Element Modelling.
Materials Structure & Micromechanics of Fracture VIII. Zürrich: Trans Tech Publications, 2017 - (Šandera, P.), s. 186-189. Solid State Phenomena, 258. ISBN 978-3-03835-626-4. ISSN 1662-9779.
[MSMF8. International Conference on Materials Structure and Micromechanics of Fracture /8./. Brno (CZ), 27.06.2016-29.06.2016]
Grant CEP: GA ČR GA14-11234S
Institucionální podpora: RVO:68081723
Klíčová slova: cohesive zone model * Si3N4 composite * finite element user’s procedure
Obor OECD: Ceramics

Specific silicon nitride ceramics, the influence of the grain size and orientation on the bridging mechanisms was found. In ceramic matrix composites, crack-bridging mechanisms can provide substantial toughness enhancement coupled with the same and/or increased strength. The prediction of the crack propagation through interface elements based on the fracture mechanics approach and cohesive zone model is investigated. From a number of damage concepts the cohesive models seem to be especially attractive for the practical applications. Within the standard finite element package Abaqus a new finite element has been developer, it is written via the UEL (user’s element) procedure. Its shape can be modified according to the experimental data for the set of ceramics and composites. The element seems to be very stable from the numerical point a view. The shape of the traction separation law for four experimental materials is estimated via the iterative procedure based on the FEM modeling and experimentally determined displacement in indentation experiments, J-R curve is predicted and stability of the bridging law is tested.
Trvalý link: http://hdl.handle.net/11104/0271376