Prediction of edge and tunnelling crack formation in layered ceramics using a stress-energy fracture criterion
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Date
2023-07-01
Authors
Papšík, Roman
Ševeček, Oldřich
Hofer, Anna-Katherina
Kraleva, Irina
Kreith, Josef
Bermejo, Raul
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
ELSEVIER SCI LTD
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Abstract
A coupled stress-energy criterion is utilized to predict initiation of both edge and tunnelling cracks in layered ceramics containing thermal residual stresses. Edge (surface) cracks may originate in layers having high compressive in-plane stresses while tunnelling (internal) cracks may form in layers with high tensile in-plane stresses. This work investigates the influence of both the residual stresses magnitude and layer thickness on the formation of surface cracks and provides a design map defining safe regions where no cracks will be present in the sintered multilayer architecture upon reaching the room temperature. Necessary stress and energy inputs to evaluate the coupled criterion are calculated using the finite element method. Simulation results are validated with experimental observations on sample architectures fabricated with layers of various thicknesses and in -plane thermal residual stresses. The good agreement demonstrates the potential of the stress-energy coupled criterion for designing crack-free multi-layered ceramic architectures.
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Citation
Journal of the European Ceramic Society. 2023, vol. 43, issue 7, p. 2928-2934.
https://www.sciencedirect.com/science/article/pii/S0955221922009839?via%3Dihub
https://www.sciencedirect.com/science/article/pii/S0955221922009839?via%3Dihub
Document type
Peer-reviewed
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Published version
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Language of document
en