| Autor: |
S. Haig, W. R. Cannon, Philip J. Whalen |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings |
| DOI: |
10.1002/9780470313978.ch47 |
| Popis: |
Two silicon nitride materials of the same composition but different microstructures were crept in tension using an apparatus with pneumatic loading laser extensometry. The coarse grained material had significantly greater creep resistance. The anelastic behavior of these two materials after removal of the load during a creep run was studied. Strain recoveries of up to 40 percent have been observed in the time range of 10 to 30 hours after load removal at the test temperature. The magnitude of the viscoelastic strain recovery was dependent on the amount of prestrain present at the time of load removal in both materials. A generalized Voigt model of viscoelastic response can be used to interpret the effects of grain size, accumulated strain, and strain rate on the anelastic response in these silicon nitride materials. 19 refs. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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