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Biomimetic patterns in 3D printed auxetic metamaterials
Bečka, Filip ; Vozárik, Andrej (oponent) ; Lepcio, Petr (vedoucí práce)
The master’s thesis deals with the implementation of biomimetic patterns into 3D printed structures, focusing on the study of auxetic behaviour and mechanical properties. For this purpose, six types of structures were designed and prepared using fused deposition modelling. Polyethylene terephthalate glycol (PET-G) was chosen as the printing material. Mechanical testing involved static compression tests supplemented with video recordings, which served to determine Poisson's ratio and to study the effect of implemented reinforcement on the deformation behaviour of the structures. The proposed biomimetic reinforcement further increased the already good energy absorption efficiency of the auxetic structures. At the highest level of reinforcement, significantly more uniform macroscopic deformation of the structure was observed. The reinforcement also led to an increase in the yield stress and specific modulus in auxetic structures. In contrast, in non-auxetic structures, the addition of reinforcement resulted in a decrease in specific modulus. Finally, the influence of reinforcement on the auxetic behaviour of the structure was examined. The incorporation of reinforcing elements led to an increase in Poisson's ratio, but not to a transition to positive values. A significant boundary effect was observed in the structures, with different values of Poisson's ratio measured in different parts of the prepared structures.
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