Mechanical Properties of Flexible TPU-Based 3D Printed Lattice Structures: Role of Lattice Cut Direction and Architecture

This study addresses the mechanical behavior of lattice materials based on flexible thermoplastic polyurethane (TPU) with honeycomb and gyroid architecture fabricated by 3D printing. Tensile, compression, and three-point bending tests were chosen as mechanical testing methods. The honeycomb architec...

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Bibliographic Details
Published in:Polymers 2021-09, Vol.13 (17), p.2986
Main Authors: Beloshenko, Victor, Beygelzimer, Yan, Chishko, Vyacheslav, Savchenko, Bogdan, Sova, Nadiya, Verbylo, Dmytro, Voznyak, Andrei, Vozniak, Iurii
Format: Article
Language:English
Subjects:
3-D printers
Additive manufacturing
Anisotropy
Bend tests
Compression tests
Energy
Energy absorption
Investigations
Mechanical properties
Mechanical tests
Polymers
Polyurethane resins
Porous materials
Three dimensional printing
Urethane thermoplastic elastomers
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Summary:This study addresses the mechanical behavior of lattice materials based on flexible thermoplastic polyurethane (TPU) with honeycomb and gyroid architecture fabricated by 3D printing. Tensile, compression, and three-point bending tests were chosen as mechanical testing methods. The honeycomb architecture was found to provide higher values of rigidity (by 30%), strength (by 25%), plasticity (by 18%), and energy absorption (by 42%) of the flexible TPU lattice compared to the gyroid architecture. The strain recovery is better in the case of gyroid architecture (residual strain of 46% vs. 31%). TPUs with honeycomb architecture are characterized by anisotropy of mechanical properties in tensile and three-point bending tests. The obtained results are explained by the peculiarities of the lattice structure at meso- and macroscopic level and by the role of the pore space.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13172986