Speaker
Description
Understanding high-temperature degradation processes is critical to the development of hypersonic flight systems for space exploration and national defense. To be safe and effective throughout the extreme conditions of re-entry, designs must anticipate and be robust to materials changes through ablation and oxidation. Hand-in-hand with the development of computational capabilities has been a need for detailed data across scales to both validate models and identify key physical mechanisms.
This talk will discuss how X-ray imaging at high resolution has become an invaluable tool to resolve, quantify and understand the response of porous materials subjected to extreme conditions. We will show two synchrotron light source experiments where the ablation phenomenon is resolved using X-ray micro-tomography at high temperature, and in 4D, that is in space at microscopic scale and in time. The first experiment focuses on the high temperature gasification of carbon fibers, where limiting oxidation regimes, from diffusion- to reaction-controlled, are resolved at rates beyond one tomoscan per second. The second experiment focuses on the pyrolysis of superlight ablators, where we highlight the key role of decomposing fillers in the evolution of porosity and material properties with temperature.
Decomposition-resolved data constitutes the basis to develop closure models for effective properties as a function of material degradation.
| Country | United States |
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