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Mechanics of 3D Printed Architected Materials: Design, Modeling and Testing
Başlık:
Mechanics of 3D Printed Architected Materials: Design, Modeling and Testing
Yazar:
Li, Tiantian, author.
ISBN:
9780438140318
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (175 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Lifeng Wang Committee members: Shikui Chen; Fu-pen Chiang; T. Venkatesh.
Özet:
Architecture provides an additional degree of freedom in the design of materials and determines their mechanical properties. This dissertation presents some works on designing, fabricating, modeling and testing architected materials. The goals are to establish the relationships between the internal structure of a material and its mechanical properties and discover existing and potential new materials, especially those with improved and even 'tunable' properties for potential mechanical applications.
The first key objective aims at exploring the novel architected cellular materials with negative Poisson's ratio (NPR) also named as 'auxetics'. These materials have unusual mechanical behavior, therefore, exhibit many desirable properties and broad potential applications. However, most of studied auxetic materials are two-dimensional and exhibit NPR effect at small mechanical deformation and few of them have been fabricated to the practical stage. To solve these challenging problems, a class of architected cellular materials were created by replacing regular straight beam with sinusoidally shaped ones. These cellular materials exhibit mechanically tunable Poisson's ratio at an extreme large tensile deformation (≥100%). Moreover, our design concept can be extended to construct 3D periodic cellular materials by harnessing out-of-plane deformation to achieve a negative Poisson's ratio. Furthermore, a group of sandwich composites with 3D-printed auxetic cellular core materials exhibit a sequential snap-through instability under bending deformation which significantly enhances the energy absorption abilities.
The second key objective aims at discovering the structure-property-function relationships of architected multi-material composites. Combining multiple (contrasting) materials enabling to mix elastic, plastic and viscous materials could lead to completely new classes of mechanical architected materials. Here, a system of 3D periodic glassy polymer/elastomer co-continuous architected composites with different geometric arrangements of the constituents were created through simulations and experiments. These 3D periodic co-continuous composites exhibit enhanced mechanical properties including stiffness, strength, energy absorption, and fracture toughness, which are due to the mutual constraints between two phases of the co-continuous architectures. Another new group of 3D printed architected composites named auxetic composites combining with auxetic lattice reinforcement (glassy polymer) and matrix (elastomer) exhibits enhanced stiffness, hardness and toughness. This improved mechanical performance is due to the NPR effect of the auxetic reinforcements, which makes the matrix in a state of biaxial or triaxial compression and hence provides additional support.
The findings presented here will open new avenues to achieve improved and tunable mechanical properties using architected material systems.
Notlar:
School code: 0771
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(694113.1) | 694113-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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