Extension of Hasselman's thermal shock theory for crack/microstructure interactions in refractories
| Autor: | Richard C. Bradt, V. R. Salvini, Victor C. Pandolfelli |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Thermal shock
Work (thermodynamics) Materials science Process Chemistry and Technology Fracture mechanics Dissipation Microstructure Surface energy Surfaces Coatings and Films Electronic Optical and Magnetic Materials Materials Chemistry Ceramics and Composites Forensic engineering Fracture (geology) Volumetric density Composite material |
| Zdroj: | Ceramics International. 38:5369-5375 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2012.03.046 |
| Popis: | Thermal shock damage resistance in advanced refractories depends on the crack interactions with the microstructure. These energy dissipation mechanisms during crack propagation are not directly considered in the original classical thermal shock model of Hasselman. They are imbedded within the N and g terms of his derivations. In this extension of Hasselman’s work, an expression is presented, which estimates the final crack size (‘f) as the fracture surface energy ratio between gNBT and gWOF. That expression directly considers the crack interaction mechanisms with the refractory microstructure as it includes the R-curve behavior effects. In addition, the equation presented allows a quantitative evaluation of the volumetric density of cracks in refractories. # 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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