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- W831596178 abstract "This study is focused on the characterizations of the ablative properties of different protections for very high temperatures applications. Using a specific characterization method, the physical mechanisms involved during the process have been identified. Two different test benches with a normal gas flow have been used in this investigation. The first one is laboratory test bench based on an oxyacetylene torch (conditions termed thermal ablation with a 3000°C gas temperature). The second one is a large scale facility producing a hot supersonic gas flow (Mach number = 3) and a temperature about 2000°C, leading to an Various composite materials have been tested by mixing different matrices, different architectures and different kind of fibers. Under condition (oxyacetylene torch), mass loss and surface recession are due to the thermo-oxidation reactions occurring both in the matrix and in the fibers. Once the pyrolysis reaction completed, a volatilization of the composite during the exposure is observed. In contrast, under aerothermal conditions, surface recession is observed prior to the completion of the oxidation/pyrolysis reactions. Under such conditions, the degradation of local mechanical properties associated with the strong mechanical impact of the supersonic jet on the material leads to ablation. In parallel, a numerical model of has been developed. One of the main requirements was to develop an engineering tool to design various types of protection systems (e. G. Organic composite, ceramic composites…) and hence various processes. This model is based on the oxidation/pyrolysis reactions kinetics. It has been identified for one composite material whose parameters (i. E. Thermal conductivity, specific heat, density) have been fully characterized as a function of temperature and degradation state. First numerical simulations were compared to the experimental results on the oxyacetylene torch test to validate the model for a future extension of modelling under aerothermal conditions." @default.
- W831596178 created "2016-06-24" @default.
- W831596178 creator A5023865605 @default.
- W831596178 date "2011-01-01" @default.
- W831596178 modified "2023-09-23" @default.
- W831596178 title "Caractérisations à très hautes températures de protections thermiques sous impact normal d'un jet chaud supersonique : influence du couplage aérothermique et des propriétés matériaux sur la tenue à l'ablation" @default.
- W831596178 hasPublicationYear "2011" @default.
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