Browsing by Author "Fernandes, Beatriz Teixeira"
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- 3D Printed PETG S-Shaped Auxetic Structure: An Experimental and Numerical StudyPublication . Fernandes, Beatriz Teixeira; Dutra, Thiago Assis; Silva, Abílio Manuel Pereira da; Aguiar, Martim Lima deThis dissertation’s main interest is to investigate auxetic structures and their potential applications, especially in the aeronautical sector. Due to the unique properties of these structures, they are increasingly gaining importance in the aeronautical industry for addressing many problems and challenges. Auxetic structures have potential applications in lightweight structures with high mechanical properties and a significant energy absorption capacity. During this study, it is understood that additive manufacturing (AM) plays a crucial role in auxetic structures as it allows the construction of complex structures, such as auxetic structures. After a review of various types of auxetic structures, one structure stood out, not only for its unusual shape but also for its properties. This S-shaped structure stands out for reduced stress concentration, high energy absorption capacity, and high elastic recovery. Due to this distinction, it was decided to study this structure in detail. In this work, several samples of S-shaped structures were manufactured using AM as the manufacturing method and polyethylene terephthalate glycol (PETG) as the material. The samples underwent two types of experimental tests, compression tests, and creep-recovery tests. This allowed obtaining valuable information about the behavior of these structures under load and their recovery after the application of loads. A numerical model was also developed to better understand the S-shaped structure. The numerical model was based on data obtained from the characterization of the PETG material. The simulation results are meticulously compared to experimental data, highlighting the effectiveness of the numerical models despite inherent complexities. Finally, the findings of this work project a promising future for PETG and auxetic structures in various engineering domains, including composites, automotive safety, aeronautics, and aerospace. The foundation established in this work paves the way for future research, enabling a deeper exploration of the possibilities and implications of these innovative materials and structures.