Estimation of stepwise crack propagation in ceramic laminates with strong interfaces
| العنوان: | Estimation of stepwise crack propagation in ceramic laminates with strong interfaces |
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| المؤلفون: | Luboš Náhlík, Pavel Huta, Kateřina Štegnerová |
| المصدر: | Frattura ed Integrita Strutturale. 2015, vol. 9, issue 34, p. 116-124. Frattura ed Integrità Strutturale, Vol 9, Iss 34, Pp 116-124 (2015) Frattura ed Integrità Strutturale, Vol 9, Iss 34 (2015) Frattura ed Integrità Strutturale; Vol 9 No 34 (2015): October 2015 Frattura ed Integrità Strutturale; V. 9 N. 34 (2015): October 2015 |
| بيانات النشر: | Gruppo Italiano Frattura, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Materials science, lcsh:Mechanical engineering and machinery, lcsh:TA630-695, Crack behaviour, Crack growth resistance curve, Crack propagation direction, chování trhliny, Crack closure, Residual stresses, Fracture toughness, Residual stress, Strain energy density factor, strain energy density factor, lcsh:TJ1-1570, Ceramic, Composite material, crack behaviour, Ceramic laminates, Mechanical Engineering, směr šíření trhliny, crack propagation direction, Fracture mechanics, Strain energy density function, lcsh:Structural engineering (General), Mechanics of Materials, visual_art, residual stresses, Fracture (geology), visual_art.visual_art_medium, reziduální napětí, faktor hustoty deformační energie, Keramické lamináty |
| الوصف: | During the last years many researchers put so much effort to design layered structures combining different materials in order to improve low fracture toughness and mechanical reliability of the ceramics. It has been proven, that an effective way is to create layered ceramics with strongly bonded interfaces. After the cooling process from the sintering temperature, due to the different coefficients of thermal expansion of individual constituents of the composite, significant internal residual stresses are developed within the layers. These stresses can change the crack behaviour. This results to the higher value of so-called apparent fracture toughness, i.e. higher resistance of the ceramic laminate to the crack propagation. The contribution deals with a description of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is to clarify crack behaviour in the compressive layer and provide computational tools for estimation of crack behaviour in the field of strong residual stresses. The crack propagation was investigated on the basis of linear elastic fracture mechanics. Fracture parameters were computed numerically and by author’s routines. Finite element models were developed in order to obtain a stress distribution in the laminate containing a crack and to simulate crack propagation. The sharp change of the crack propagation direction was estimated using Sih’s criterion based on the strain energy density factor. Estimated crack behaviour is qualitatively in a good agreement with experimental observations. Presented approach contributes to the better understanding of the toughening mechanism of ceramic laminates and can be advantageously used for design of new layered ceramic composites and for better prediction of their failure. |
| وصف الملف: | text; application/pdf |
| اللغة: | English |
| تدمد: | 1971-8993 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39b5864e99a7676d9e9e9b8207f023ec https://hdl.handle.net/11012/180627 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....39b5864e99a7676d9e9e9b8207f023ec |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19718993 |
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