Multiscale Dynamics of Aerogel and Aerogel Composite Matching Layers

• Applicants: Professor Dr.-Ing. Mikhail Itskov; Professorin Dr. Barbara Milow
• Subject Area: Mechanics ; Applied Mechanics, Statics and Dynamics
• Term: since 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 520432297

The main application field of silica aerogels is currently limited to thermal insulation, although their properties regarding sound absorption or acoustic insulation are also highly promising. The acoustic properties have been investigated over the last 30 years. However, major gaps remain in understanding of the underlying physical mechanisms. Moreover, to our best knowledge no modelling approaches have been developed that can describe the behavior of aerogels and aerogel composites for static and dynamic applications. The proposal aims to enhance the general understanding of the microstructure effects on the overall macrodynamic properties of aerogels and their composites. A micromechanical finite element model based on the diffusion-limited cluster-cluster aggregation method (DLCA) will be adapted to describe the dynamic response of the microstructure. This model will be correlated to the micromechanical structural features of the specified aerogel and aerogel composite samples. Furthermore, macro-mechanical analytical models for thin matching layers will be developed and the influence of their key parameters will be studied. Effects of the anisotropy and functionally graded structure on the wave propagation will be considered. Experimental, numerical and analytical results will be compared. Finally, the models will be optimized for tailored dynamic properties of aerogel and their composites. Since the numerical and analytical inputs are correlated to the synthesis parameters, it will be possible to control target parameters as Young’s modulus or sound absorption coefficients. The effectiveness of the modelling approach is verified through a synthesis and experimental investigation of a particular aerogel and aerogel composite. This process will generate an aerogel/aerogel composite with specific desired physical properties.

• DFG Programme: Research Grants
• International Connection: Turkey
• Partner Organisation: TÜBITAK The Scientific and Technology Research Council of Turkey
• Co-Investigator: Dr.-Ing. Ameya Govind Rege
• Cooperation Partner: Professor Dr. Baris Erbas