Influence of the internal geometry on the elastic properties of materials using 3D printing of computer-generated random microstructures

Zerhouni, Othmane; Tarantino, M.G.; Danas, Kostas; Hong, Fei

doi:10.1190/segam2018-2998182.1

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…9b. In agreement with earlier studies by Zerhouni et al (2018), Zerhouni et al (2019) and , at small strains, the response is rather converged and representative. Nonetheless, the initial buckling and post-buckling response becomes highly scattered at large strains.…”

Section: Representativity and Isotropy Of M-voronoisupporting

confidence: 92%

Mechanically-grown morphogenesis of Voronoi-type materials: Computer design, 3D-printing and experiments

Hooshmand-Ahoor

Tarantino

Danas

2022

Mechanics of Materials

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Section: Representativity and Isotropy Of M-voronoisupporting

confidence: 92%

Mechanically-grown morphogenesis of Voronoi-type materials: Computer design, 3D-printing and experiments

Hooshmand-Ahoor

Tarantino

Danas

2022

Mechanics of Materials

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“…A printed structure must be topologically connected such that it can be mechanically selfsupporting after the procedure. Thus, the void (matrix) phase of our 3D hyperuniform packings(dispersions) can be readily printed [102]. Due to recent developments in 3D printing methods, some commercial desktop 3D printers can print a sample with dimensions 125 × 125 × 125 cm 3 in 50 h with around 100 µm XY resolution and 20 µm in Z resolution.…”

Section: Fabrication Of Our Designsmentioning

confidence: 99%

Methodology to construct large realizations of perfectly hyperuniform disordered packings

Kim

Torquato

2019

Phys. Rev. E

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Disordered hyperuniform packings (or dispersions) are unusual amorphous two-phase materials that are endowed with exotic physical properties. Such hyperuniform systems are characterized by an anomalous suppression of volume-fraction fluctuations at infinitely long-wavelengths, compared to ordinary disordered materials. While there has been growing interest in such singular states of amorphous matter, a major obstacle has been an inability to produce large samples that are perfectly hyperuniform due to practical limitations of conventional numerical and experimental methods. To overcome these limitations, we introduce a general theoretical methodology to construct perfectly hyperuniform packings in d-dimensional Euclidean space R d . Specifically, beginning with an initial general tessellation of space by disjoint cells that meets a "bounded-cell" condition, hard particles are placed inside each cell such that the local-cell particle packing fractions are identical to the global packing fraction. We prove that the constructed packings with a polydispersity in size in R d are perfectly hyperuniform in the infinite-sample-size limit and the hyperuniformity of such packings is independent of particle shapes, positions, and numbers per cell. We use this theoretical formulation to devise an efficient and tunable algorithm to generate extremely large realizations of such packings. We employ two distinct initial tessellations: Voronoi as well as sphere tessellations. Beginning with Voronoi tessellations, we show that our algorithm can remarkably convert extremely large nonhyperuniform packings into hyperuniform ones in R 2 and R 3 . Implementing our theoretical methodology on sphere tessellations, we establish the hyperuniformity of the classical Hashin-Shtrikman multiscale coated-spheres structures, which are known to be two-phase media microstructures that possess optimal effective transport and elastic properties. A consequence of our work is a rigorous demonstration that packings that have identical tessellations can either be nonhyperuniform or hyperuniform by simply tuning local characteristics. It is noteworthy that our computationally designed hyperuniform two-phase systems can easily be fabricated via state-of-theart methods, such as 2D photolithographic and 3D printing technologies. In addition, the tunability of our methodology offers a route for the discovery of novel disordered hyperuniform two-phase materials.

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“…Several approaches are reported in the literature to enhance the bone tissue regeneration of Ti-based devices by the development of appropriate trabecular topography, bio-coating [12] or specific pore structure [13]. The internal pore structure also affects the mechanical stiffness of the material [14][15][16] thereby being instrumental for the design of novel long-lasting implants.…”

Section: Introductionmentioning

confidence: 99%

Dual-Functional Nano-Functionalized Titanium Scaffolds to Inhibit Bacterial Growth and Enhance Osteointegration

et al. 2021

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Implantable biomaterials play a key role for the success of orthopedic surgery procedures. However, infections remain one of the most damaging post-operative complications that lead to the implant failure. Recently, several approaches have been proposed to avoid or manage implant-associated infections. Among these, an appropriate surface functionalization to confer intrinsic antibacterial properties preserving the osteo-integration ability represents an appealing strategy for the development of innovative implant materials. Titanium and its alloys are the most used materials for manufacturing of both articular and bone skull prostheses as well as dental implants. However, to date there is still a significant clinical need to improve their bioactivity, osseointegration and antibacterial activity. In this study, titanium biomimetic scaffolds are prepared by nano-functionalization with TiO2 (Ti_TiO2) and γFe2O3 (Ti_γFe2O3). Both cytocompatibility and antibacterial activity have been evaluated. Data show that both nano-functionalized scaffolds exhibit a good antibacterial activity towards Staphylococcus aureus, reducing colony number to 99.4% (Ti_TiO2) and 99.9% (Ti_γFe2O3), respectively. In addition, an increase of both human adipose-derived mesenchymal stem cells (hADSCs) cell proliferation (up to 4.3-fold for Ti_TiO2 and 3.7-fold for Ti_gFe2O3) and differentiation has been observed. These data suggest that these nano-functionalized titanium substrates represent promising prototypes for new antimicrobial and osteoconductive biomaterials to be used in the orthopedic field to reconstruct significant bone defect.

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Influence of the internal geometry on the elastic properties of materials using 3D printing of computer-generated random microstructures

Cited by 8 publications

References 14 publications

Mechanically-grown morphogenesis of Voronoi-type materials: Computer design, 3D-printing and experiments

Mechanically-grown morphogenesis of Voronoi-type materials: Computer design, 3D-printing and experiments

Methodology to construct large realizations of perfectly hyperuniform disordered packings

Dual-Functional Nano-Functionalized Titanium Scaffolds to Inhibit Bacterial Growth and Enhance Osteointegration

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