| Autor: |
Ravi C. Penmetsa, Thomas Bouchenot, Ali P. Gordon, Emily Judd |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. |
| DOI: |
10.2514/6.2015-1580 |
| Popis: |
Cumulative damage theory has been extended to develop a deterministic fatigue life prediction model for materials subjected to superimposed thermo-acousto-mechanical cycling. This loading profile is exhibited by particular external panels of reusable hypersonic cruise vehicles. Both creep and fatigue (LCF) test data have been acquired for two candidate fuselage materials: a Ni-base alloy (IN617) and a near-alpha titanium alloy (Ti-6242S). Although both materials exhibit considerable strength against isothermal fatigue and/or creep damage, their oxidative responses gives rise to surface-form cracks under cyclic temperature conditions. Damage modules for fatigue, creep, and coupled environmentalfatigue life are developed to predict fatigue life under service conditions. Although a module is also included for acoustic cycling, the combined model is demonstrated for available data. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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