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Crack Growth Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach
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SYSNO ASEP 0434890 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Crack Growth Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach Author(s) Kozák, Vladislav (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCIDNumber of authors 2 Source Title Materials Structure and Micromechanics of Fracture VII. - Zurich : Trans Tech Publications, 2014 / Šandera P. - ISSN 1013-9826 - ISBN 978-3-03785-934-6 Pages s. 193-196 Number of pages 4 s. Publication form Print - P Action MSMF 7 - International Conference on Materials Structure & Micromechanics of Fracture /7./ Event date 01.07.2013-03.07.2013 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CH - Switzerland Keywords cohesive zone model ; Si 3 N 4 composite ; finite element user’s procedure Subject RIV JL - Materials Fatigue, Friction Mechanics Institutional support UFM-A - RVO:68081723 UT WOS 000336694400041 EID SCOPUS 84891864144 DOI https://doi.org/10.4028/www.scientific.net/KEM.592-593.193 Annotation Specific silicon nitride based materials are considered according to certain practical requirements of process, the influence of the grain size and orientation on the bridging mechanisms was found. Crack-bridging mechanisms can provide substantial increases in toughness coupled with the strength in ceramics. The prediction of the crack propagation through interface elements based on the fracture mechanics approach and cohesive zone model is investigated and from the amount of damage models the cohesive models seem to be especially attractive for the practical applications. Using cohesive models the behaviour of materials is realized by two types of elements. The former is the element for classical continuum and the latter is the connecting cohesive element. Within the standard finite element package Abaqus a new finite element has been developed; it is written via the UEL (user’s element) procedure. Its shape can be very easily modified according to the experimental data for the set of ceramics and composites. The new element seems to be very stable from the numerical point a view. The shape of the traction separation law for three experimental materials is estimated from the macroscopic tests, J–R curve is predicted and stability of the bridging law is tested. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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