Thermal shock strength of Al2O3 by laser irradiation method
| Autor: | Shigeyasu Amada, Shigeru Akiyama |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Thermal shock
Materials science Process Chemistry and Technology Mineralogy Laser Finite element method Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention law visual_art Ultimate tensile strength Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Fracture (geology) Irradiation Ceramic Composite material Beam (structure) |
| Zdroj: | Ceramics International. 27:171-177 |
| ISSN: | 0272-8842 |
| Popis: | Various structural ceramics have been developed as heat-resistant materials. It is very important to investigate their thermal shock characteristics. This report presents a newly developed, laser irradiation method to evaluate thermal shock strength and proposes that a critical power density can be a new measure to evaluate heat resistant materials. The temperature and thermal stress distributions of the cylindrical shaped Al 2 O 3 ceramics under irradiation by CO 2 laser beams are analyzed using FEM. The maximum tensile and compressive stresses are obtained with respect to beam diameters for various power densities. These relations lead to critical power densities at which materials are fractured. The relationships between the critical power density and beam diameters derive critical fracture curves which gives the fracture criterion of ceramics. Finally, the irradiation experiments were carried out and their results got a good agreement with the theoretical fracture criterion. It was concluded that the critical fracture curve can be a new measure to evaluate thermal shock resistance of ceramics. |
| Databáze: | OpenAIRE |
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