University of Twente Student Theses


Maximizing energy absorption properties of 3D printed programmed auxetic metamaterials

Postmes, Jonne F. (2022) Maximizing energy absorption properties of 3D printed programmed auxetic metamaterials.

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Abstract:Research on mechanical metamaterials has become more accessible in recent years, in part due to the advances in 3D printing technologies. Allowing for easy access to the rapid prototyping of complex multi-material structures. This thesis has studied a chiral-based auxetic shape and how multi-material designs can program this structure's behaviour. Samples with dimensions of 50x50x15mm were created with an Ultimaker3 and made from PLA, C8, TPC, and PCL polymers. They were printed with a 0.4mm nozzle, at a 0.2mm layer height, and compressed by a Zwick Z5.0 mechanical tester. This thesis concluded with three experiments to determine the optimal shape, material, and multi-material configurations for energy absorption properties. A circular symmetrical chiral structure was found to have the best energy absorption properties, out of eight different auxetic shapes. Also, PLA and PCL were selected as hard and soft materials respectively out of four polymers. This was based on their energy absorption performance and good adhesion with each other. Four multimaterial structures were created with different patterns. Resulting in different responses based on how the cellular structure was divided into hard and soft materials. Therefore, this research has proved the possibility to program the metamaterial structures based on the required functionality.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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