An Auxetic Construction Kit for Turbomachinery Application

Abstract

- Auxetic structures are characterised by a negative Poisson’s ratio. There are a variety of auxetic structures out of which the relevant ones are highlighted. After a simulative comparison of the thermal and mechanical properties, the most suitable structure and topology is selected for the application in turbomachinery. A parameter variation of this topology leads to an analytical model that describes the mechanical behaviour of the recursive lattice structure as a function of these geometric sizes: the recursive angle 𝛩 , the aspect ratio 𝛼 , the normalised wall thickness 𝛽 , the normalised radius 𝜅 and the cell density 𝑛 . Regarding the thermal properties, the so-called resistance length 𝑅 L is introduced, which allows a good prediction of the thermal behaviour depending on the cell dimensions. Finally, potential fields of application in the literature are outlined. not able to fully display the interrelationships between the factors and the geometry behaviour. A meta-model has to be generated to broadly understand the structure and effects of the different parameters.