Strut‐Based Cellular to Shellular Funicular Materials (Adv. Funct. Mater. 14/2022)

Akbari, Mostafa; Mirabolghasemi, Armin; Bolhassani, Mohammad; Akbarzadeh, Abdolhamid; Akbarzadeh, Masoud

doi:10.1002/adfm.202270082

Cited by 5 publications

(10 citation statements)

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“…Experimental results for 4-polytope metamaterials, gyroid, and honeycomb samples compared against P and G shellular structures. [15,17] The figure within the internal gyroid geometry. Lastly, the hexagonal honeycomb structure fails along the perpendicular plane at a random location within the tensile sample.…”

Section: Resultsmentioning

confidence: 99%

“…[4,5] The final structures typically fit into unique classes of mechanical metamaterial, which include but are not limited to auxetic, [5][6][7] energy-absorbing, [4,8] origami/kirigami shape-morphing, [9][10][11] and high stiffness and strength [12][13][14] structures. Several current publications analyze emerging new types of architected metamaterials such as strut-based cellular materials and their topological design, [15,16] shellular structures, and the stress distributions over these mathematically ideal surfaces [15,17,18] and plate-lattice structures exhibiting optimal isotropic stiffness. [19] While most mechanical metamaterials are tested in compression, [13,14,20] some studies also consider mixed mode compressive-tensile loading on structures designed to exhibit discontinuous Poisson's ratio, [21,22] variable elasticity, [23,24] and tunable stiffness.…”

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confidence: 99%

“…Figure5. Experimental results for 4-polytope metamaterials, gyroid, and honeycomb samples compared against P and G shellular structures [15,17]. The figurerepresents a) normalized Young's modulus (E=E 0 ), b) normalized strength (σ=σ y ), and c) tensile strength/Young's modulus (σ t =E 0 ) values plotted against relative sample density.…”

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confidence: 99%

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Tensile Properties of 3D‐Projected 4‐Polytopes: A New Class of Mechanical Metamaterial

Cerniauskas,

Alam

2023

Adv Eng Mater

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In this article, we research the tensile behavior mechanical metamaterial based on the 3D projections of 4D geometries (4‐polytopes). The specific properties of these mechanical metamaterials can be enhanced by more than fourfold when optimized within a framework powered by an evolutionary algorithm. We show that the best‐performing metamaterial structure, the 8‐cell (tesseract), has specific yield strength and specific stiffness values in a similar range to those of hexagonal honeycombs tested out‐of‐plane. The 8‐cell structures are also cubically symmetrical and have the same mechanical properties in three orthogonal axes. The effect of structure is quantified by comparing metamaterial tensile strength against the Young's modulus of constituent solid material. We find that the strength‐to‐modulus value of the 8‐cell structures exceeds that of the hexagonal honeycomb by 76%. The 5‐cell (pentatope) and 16‐cell (orthoplex) metamaterials are shown to be more effective under tensile loading than gyroid structures, while 24‐cell (octaplex) structures display the least optimal structure‐properties relationships. The findings presented in this paper showcase the importance of macro‐scale architecture and highlight the potential of 3D projections of 4‐polytopes as the basis for a new class of mechanical metamaterial.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Tensile Properties of 3D‐Projected 4‐Polytopes: A New Class of Mechanical Metamaterial

Cerniauskas,

Alam

2023

Adv Eng Mater

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“…Using 3D/polyhedral graphic statics as a design method and selective laser melting of AlSi10Mg for 3D printing, we fabricated a funicular shellular structure that carries internal forces axially (no transverse stress) (Figure S12, Supporting Information) and is designed to fail at its central section, which includes three outer struts and a middle strut that is difficult to access (Figure 5a and Figure S4, Supporting Information). This structure is a type of funicular polyhedral frame designed using a technique of topological subdivision which generates two‐manifold anticlastic surface‐based structures with cross‐sections normal to the direction of the internal force flow for any given loading condition [ 52–55 ] (see Supporting Information). Owing to its geometric complexity and the inaccessibility of the middle strut, this structure could not be repaired by conventional welding and would need to be re‐printed or replaced.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Healing of Fractured Metals

et al. 2023

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Repairing fractured metals to extend their useful lifetimes advances sustainability and mitigates carbon emissions from metal mining and processing. While high‐temperature techniques are being used to repair metals, the increasing ubiquity of digital manufacturing and “unweldable” alloys, as well as the integration of metals with polymers and electronics, call for radically different repair approaches. Herein, a framework for effective room‐temperature repair of fractured metals using an area‐selective nickel electrodeposition process refered to as electrochemical healing is presented. Based on a model that links geometric, mechanical, and electrochemical parameters to the recovery of tensile strength, this framework enables 100% recovery of tensile strength in nickel, low‐carbon steel, two “unweldable” aluminum alloys, and a 3D‐printed difficult‐to‐weld shellular structure using a single common electrolyte. Through a distinct energy‐dissipation mechanism, this framework also enables up to 136% recovery of toughness in an aluminum alloy. To facilitate practical adoption, this work reveals scaling laws for the energetic, financial, and time costs of healing, and demonstrates the restoration of a functional level of strength in a fractured standard steel wrench. Empowered with this framework, room‐temperature electrochemical healing can open exciting possibilities for the effective, scalable repair of metals in diverse applications.

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“…[ 2,7–11 ] Minimal surfaces are characterized by zero mean curvature and provide an efficient tessellation of space. These shell‐based materials, also referred to in the literature as “shellular materials”, [ 4,5,12 ] exhibit high stiffness and strength at ultralow densities, [ 4–6 ] and ensure lower sensitivity to stress concentrations with respect to truss‐based cellular materials. The characteristics of minimal surfaces lead to materials with superior functionalities such as energy absorption, thermal management, and biomimetic designs, among others, which make them attractive solutions for applications in aerospace, civil, mechanical, and biomedical engineering.…”

Section: Introductionmentioning

confidence: 99%

Minimal Surface‐Based Materials for Topological Elastic Wave Guiding

Guo

Rosa

Gupta

et al. 2022

Adv Funct Materials

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Materials based on minimal surface geometries have shown superior strength and stiffness at low densities, which makes them promising continuous-based material platforms for a variety of engineering applications. In this work, it is demonstrated how these mechanical properties can be complemented by dynamic functionalities resulting from robust topological guiding of elastic waves at interfaces that are incorporated into the considered material platforms. Starting from the definition of Schwarz P minimal surface, geometric parametrizations are introduced that break spatial symmetry by forming 1D dimerized and 2D hexagonal minimal surface-based materials. Breaking of spatial symmetries produces topologically non-trivial interfaces that support the localization of vibrational modes and the robust propagation of elastic waves along pre-defined paths. These dynamic properties are predicted through numerical simulations and are illustrated by performing vibration and wave propagation experiments on additively manufactured samples. The introduction of symmetry-breaking topological interfaces through parametrizations that modify the geometry of periodic minimal surfaces suggests a new strategy to supplement the load-bearing properties of this class of materials with novel dynamic functionalities.

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Strut‐Based Cellular to Shellular Funicular Materials (Adv. Funct. Mater. 14/2022)

Cited by 5 publications

References 0 publications

Tensile Properties of 3D‐Projected 4‐Polytopes: A New Class of Mechanical Metamaterial

Tensile Properties of 3D‐Projected 4‐Polytopes: A New Class of Mechanical Metamaterial

Electrochemical Healing of Fractured Metals

Minimal Surface‐Based Materials for Topological Elastic Wave Guiding

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