Molecular dynamics simulations on fracture toughness of Al2O3-SiO2 glass-ceramics
| Autor: | Charlene M. Smith, Matthew E. McKenzie, Jian Luo, Jason Thomas Harris, Binghui Deng |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Crystal Molecular dynamics Fracture toughness Nanocrystal Mechanics of Materials Aluminosilicate Deflection (engineering) visual_art 0103 physical sciences visual_art.visual_art_medium General Materials Science Ceramic Composite material 0210 nano-technology |
| Zdroj: | Scripta Materialia. 162:277-280 |
| ISSN: | 1359-6462 |
| Popis: | Driven by bottom-up microstructure design approaches to enhance glass-ceramic mechanical performance, extensive molecular dynamics simulations on binary aluminosilicate (50Al2O3-50SiO2) glasses with embedded circular and ellipsoidal nanocrystals have been conducted. Enhancement of fracture toughness KIC is widely observed and correlates with nanocrystal size, aspect ratio, relative position and angle of crystal surface to the crack tip. Crack penetration, deflection and nanocrystal cleavage are activated in different samples, leading to distinct variations in numerically measured KIC. The results provide building blocks for establishing a statistical model to encapsulate the cumulative effect of heterogeneous crystalline microstructures on the fracture behaviors in aluminosilicate glass-ceramics. |
| Databáze: | OpenAIRE |
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