Dissertation/ Thesis
An investigation of smart, inclusion-based mechanical metamaterials
| Τίτλος: | An investigation of smart, inclusion-based mechanical metamaterials |
|---|---|
| Συγγραφείς: | Galea Mifsud, Russell (2023) |
| Στοιχεία εκδότη: | University of Malta Faculty of Science. Department of Metamaterials |
| Έτος έκδοσης: | 2023 |
| Συλλογή: | University of Malta: OAR@UM / L-Università ta' Malta |
| Θεματικοί όροι: | Metamaterials, Auxetics (Materials), Finite element method -- Computer programs, Three-dimensional printing, Printing -- Computer-assisted instruction |
| Περιγραφή: | Mechanical metamaterials have captured the attention of researchers worldwide owing to their exceptional mechanical properties. They are poised to emerge as a pivotal category of materials that will shape the next generation of innovative materials. Research on auxetic materials, a class of mechanical metamaterials, has been ongoing for more than four decades, with recent years witnessing a surge in interest in the design of 3D auxetic metamaterials. Another class of metamaterials that has shown great potential is active metamaterials, which are materials that can have their geometry and/or mechanical properties tuned post-fabrication in response to external stimuli. This thesis delved into the realm of mechanical metamaterials, focusing on these two distinct categories. It introduced a novel design approach for creating 3D auxetic structures and conducted an in-depth exploration of magneto-mechanical active metamaterials. The 3D auxetic systems were intentionally designed to lay the foundation for potential future research, envisioning their transformation into active magneto-mechanical metamaterials. The mechanical properties of the 3D auxetic structures produced in this thesis were investigated through numerical simulations validated by experimental tests. It was demonstrated that a system, created through equally sized voids with a constant cross-sectional area into a solid material at specific locations in various planes, could exhibit a negative Poisson's ratio of approximately -0.5 in multiple directions. This behaviour was observed over a significant range of aperture angles for the cross-sectional areas, especially when the voids were positioned close to each other. A scalable inclusion-based active magneto-mechanical metamaterial consisting of magnetic inclusions embedded within a non-magnetic matrix was also produced. The proposed structure, based on an accordion-like structure, was shown to respond to the magnitude and direction of an external magnetic field by tuning its geometry. The basic unit was ... |
| Τύπος εγγράφου: | doctoral or postdoctoral thesis |
| Γλώσσα: | English |
| Relation: | https://www.um.edu.mt/library/oar/handle/123456789/137599 |
| Διαθεσιμότητα: | https://www.um.edu.mt/library/oar/handle/123456789/137599 |
| Rights: | info:eu-repo/semantics/openAccess ; The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. |
| Αριθμός Καταχώρησης: | edsbas.4D01C93F |
| Βάση Δεδομένων: | BASE |
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