Designer Matter: A perspective

Reis, Pedro; Jaeger, Heinrich M.; Hecke, Martin van

doi:10.1016/j.eml.2015.09.004

Cited by 87 publications

(68 citation statements)

References 67 publications

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“…6(c), provides a design guideline for the shape that a defect should have in order for a shell to buckle at the lowest possible pressure. Whereas traditional applications in structural mechanics would typically seek to maximize j d , these findings could be useful for the more recent movement of utilizing buckling as a mechanism for functionality [37,38].…”

Section: Characterization Of the Imperfect Shell By A Singlementioning

confidence: 99%

The Geometric Role of Precisely Engineered Imperfections on the Critical Buckling Load of Spherical Elastic Shells

Lee

Jiménez

Marthelot

et al. 2016

Journal of Applied Mechanics

Self Cite

143

133

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We study the effect of a dimplelike geometric imperfection on the critical buckling load of spherical elastic shells under pressure loading. This investigation combines precision experiments, finite element modeling, and numerical solutions of a reduced shell theory, all of which are found to be in excellent quantitative agreement. In the experiments, the geometry and magnitude of the defect can be designed and precisely fabricated through a customizable rapid prototyping technique. Our primary focus is on predictively describing the imperfection sensitivity of the shell to provide a quantitative relation between its knockdown factor and the amplitude of the defect. In addition, we find that the buckling pressure becomes independent of the amplitude of the defect beyond a critical value. The level and onset of this plateau are quantified systematically and found to be affected by a single geometric parameter that depends on both the radius-to-thickness ratio of the shell and the angular width of the defect. To the best of our knowledge, this is the first time that experimental results on the knockdown factors of imperfect spherical shells have been accurately predicted, through both finite element modeling and shell theory solutions.

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Section: Characterization Of the Imperfect Shell By A Singlementioning

confidence: 99%

The Geometric Role of Precisely Engineered Imperfections on the Critical Buckling Load of Spherical Elastic Shells

Lee

Jiménez

Marthelot

et al. 2016

Journal of Applied Mechanics

Self Cite

143

133

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“…Many of these structures show superior mechanical properties, such as the maximized load capacities of marine organisms7891011. In contrast, the rapid progress of material processing technology has enabled the design and fabrication of man-made structures, inspired by nature and based on scientific background1213141516. Although may artificial materials have yet to achieve the robustness and multi-functionality of biologically refined materials, artificial systems hold potential for exceptional performances.…”

mentioning

confidence: 99%

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Tanaka

Suga

Iwata

et al. 2017

Sci Rep

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Anisotropic materials form inside living tissue and are widely applied in engineered structures, where sophisticated structural and functional design principles are essential to employing these materials. This paper presents a candidate laminated open-cell framework, which is an anisotropic material that shows remarkable mechanical performance. Using additive manufacturing, artificial frameworks are fabricated by lamination of in-plane orthotropic microstructures made of elbowed beam and column members; this fabricated structure features orthogonal anisotropy in three-dimensional space. Uniaxial loading tests reveal strong auxeticity (high negative Poisson’s ratios) in the out-of-plane direction, which is retained reproducibly up to the nonlinear elastic region, and is equal under tensile and compressive loading. Finite element simulations support the observed auxetic behaviors for a unit cell in the periodic framework, which preserve the theoretical elastic properties of an orthogonal solid. These findings open the possibility of conceptual materials design based on geometry.

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“…[1][2][3] Through careful design of the material's architecture, new material properties have been demonstrated, including negative index of refraction, 4,5 negative Poisson's ratio, 6 high stiffness to weight ratio 7,8 and optical 9 and mechanical 10 cloaking. However, most of the proposed architected materials (also known as metamaterials) have a unique structure that cannot be reconfigured after fabrication, making them suitable only for a specific task and limiting their applicability to well-known and controlled environments.…”

Section: Introductionmentioning

confidence: 99%

Rational design of reconfigurable prismatic architected materials

Overvelde

Weaver²,

Hoberman

et al. 2017

Nature

273

182

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Advances in fabrication technologies are enabling the production of architected materials with unprecedented properties. While most of these materials are characterized by a fixed geometry, an intriguing avenue is to incorporate internal mechanisms capable of reconfiguring their spatial architecture, therefore enabling tunable functionality. Inspired by the structural diversity and foldability of the prismatic geometries that can be constructed using the snapology origami-technique, here we introduce a robust design strategy based on space-filling polyhedra to create 3D reconfigurable materials comprising a periodic assembly of rigid plates and elastic hinges. Guided by numerical analysis and physical prototypes, we systematically explore the mobility of the designed structures and identify a wide range of qualitatively different deformations and internal rearrangements. Given that the underlying principles are scale-independent, our strategy can be applied to design the next generation of reconfigurable structures and materials, ranging from transformable meter-scale architectures to nanoscale tunable photonic systems.

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Designer Matter: A perspective

Cited by 87 publications

References 67 publications

The Geometric Role of Precisely Engineered Imperfections on the Critical Buckling Load of Spherical Elastic Shells

The Geometric Role of Precisely Engineered Imperfections on the Critical Buckling Load of Spherical Elastic Shells

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Rational design of reconfigurable prismatic architected materials

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