The influence of unshielded small cracks in the fracture toughness of yttria and of ceria stabilised zirconia
| Autor: | Joan Josep Roa, Marc Anglada, M. Turon-Vinas, Latifa Melk, Marta-Lena Antti |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials, Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials |
| Předmět: |
Materials science
Fracture stress 02 engineering and technology ceramics Enginyeria dels materials [Àrees temàtiques de la UPC] 01 natural sciences size Pulsed laser ablation Mecànica de fractura Fracture toughness 0103 physical sciences Materials Chemistry Forensic engineering Fracture mechanics Cubic zirconia Ceramic Composite material 12Ce-ZrO2 Yttria-stabilized zirconia 010302 applied physics Zirconium alloys Fracture resistance curves R-curve behavior transformation Zirconi -- Propietats mecàniques 3Y-ZrO2 021001 nanoscience & nanotechnology Grain size visual_art Ceramics and Composites visual_art.visual_art_medium Zirconia 0210 nano-technology |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The fracture toughness, Ric of two 3Y-ZrO2 with different grain size (177 and 330 nm) and 12Ce-ZrO2 were determined from a sharp micro-machined notch by Ultra-Short Pulsed Laser Ablation (UPLA) where a micro-cracked zone and non-transformed is generated in front of the notch. The notch plus the damage behaved as an unshielded edge surface crack. The fracture stress, sigma(f) of both 330 nm-3Y-ZrO2 and 12Ce-ZrO2 with similar short crack sizes were found to be comparable in despite of their different published R-curves. The results of K-IC were discussed in terms of the type of cracks induced and by using a simple R-curve model. It was concluded that for the development of high strength composites with 12Ce-ZrO2 as the matrix, the relevant K-IC that controls the sigma(f) with surface unshielded short cracks is much closer to the intrinsic K-IC than to the indentation K-IC or to the plateau K-IC of long cracks. (C) 2015 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|