| Autor: |
K. JAKUS, T. SERVICE, J. E. JUN. RITTER |
| Rok vydání: |
1980 |
| Předmět: |
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| Zdroj: |
Chemischer Informationsdienst. 11 |
| ISSN: |
0009-2975 |
| DOI: |
10.1002/chin.198021005 |
| Popis: |
The strength and fatigue behavior of a 99.5% polycrystalline alumina were measured as a function of temperature. Both the strength and fatigue behavior remained essentially constant up to 500°C; from 800° to 1100°C the strength and fatigue resistance decreased markedly and at >1100°C macroscopic creep was observed. It is believed that the decrease in strength and fatigue resistance is caused by a grain-boundary glassy phase enhancing subcritical crack growth. Proof-testing at room temperature was effective in improving the strength distributions at both room temperature and 1000°C; however, at 1000°C it was not effective, due to crack growth during the proof test. The good agreement between proof-test results and fracture-mechanics theory indicates that the same flaws control the strength at room temperature and at high temperatures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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