Introduction to Active Origami Structures

Hernandez, Edwin A. Peraza; Hartl, Darren J.; Lagoudas, Dimitris C.

doi:10.1007/978-3-319-91866-2_1

Cited by 8 publications

(3 citation statements)

References 228 publications

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“…Flat structures need to be carefully assembled to produce the desired 3D shape, whether a ship, an automobile, or a solar array. One of the oldest ways to produce 3D structures from flat objects is origami, the Japanese art of paper folding [1,2]. Origami principles can apply to other sheets of material, often with the goal of assembling the final 3D structure far from the point of production of the 2D pattern [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Bachmann

Dickey

Lazarus

2020

QuBS

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Lasers can be used to bend 2D metal sheets into complex 3D objects in a process called ‘laser forming.’ Laser forming bends metal sheets by locally heating the sheets to generate plastic strains and is an established metal bending technology in the shipbuilding industry. Recent studies have investigated the laser forming of thin metal parts as a complementary rapid prototyping technology to metal 3D printing. This review discusses the laser forming process, beginning with the mechanisms before covering various design considerations. Laser forming for the rapid manufacturing of metal parts is then reviewed, including the recent advances in process planning, before highlighting promising future research directions.

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Section: Introductionmentioning

confidence: 99%

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Bachmann

Dickey

Lazarus

2020

QuBS

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“…Origami uses folding to transform two-dimensional sheets into three-dimensional structures, and is being explored in various other fields as the enabler of new manufacturing methods [9][10][11][12]. These explorations are due to mathematical and computational advances in the design of origami structures which have expanded the spectrum of shapes that can be created using folding to intricate constructions such as freeform polyhedra, complex robotic frames, among others [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Programmable self-foldable films for origami-based manufacturing

George

Madou

Hernandez

2020

Smart Mater. Struct.

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Manufacturing of three-dimensional structures of millimeter and sub-millimeter sizes is required in emerging applications in microelectronics, packaging, and particle entrapment. This paper presents a manufacturing method for three-dimensional polyhedral structures at such scales enabled by programmable, self-foldable polymer films. The manufacturing method starts with a three-dimensional target shape and uses origami design to generate the outline and fold pattern of a planar film that can be folded towards the target shape. Double-exposure photolithography is employed to pattern a polymer film based on the generated geometry along with stiff faces of high crosslinking density and flexible folds of low crosslinking density. During the development step of the photolithography process, the folds absorb the developer solution from one side, creating a concentration gradient across their thickness. The non-uniformly absorbed developer in the folds is evaporated when the film is heated, causing non-uniform strains across their thickness and enabling self-folding. It is experimentally determined that the fold angles exhibited by the folds are directly proportional to the ratio between their width along the folding direction and the film thickness, which enables programming of the folding response through modulation of the fold dimensions. Different structures are fabricated to demonstrate the effectiveness of the developed manufacturing method.

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“…The origami structure, defined as a structure with lots of folded edges, may help to improve the electrocatalytic activity towards NRR. 35 The durability of the Mo 2 C catalyst is also studied by continuous ammonia synthesis measurements for 50 h and a comparison of other molybdenum carbides tested in similar working environment is also provided.…”

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confidence: 99%

Molybdenum Carbide Electrocatalysts for Electrochemical Synthesis of Ammonia from Nitrogen: Activity and Stability

Kannan¹,

Özden²,

Maurya³

et al. 2020

J. Electrochem. Soc.

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Ammonia production has increased from few thousand tons in 1908 to above 200 million tons per year today, revolutionizing the fertilizer industry thanks to the Haber-Bosch (HB) process. However, the HB process is highly energy intensive consuming about 1.4% of fossil energy generated worldwide and releasing 1.87 tons of CO2 per ton of ammonia produced. This further reduces ammonia’s scope as a carrier fuel for the hydrogen economy. Hence, finding alternative energy efficient ways to synthesize ammonia is important from more than one perspective. Ammonia synthesis from its constituent nitrogen and hydrogen gases is mainly hampered by the nitrogen reduction reaction (NRR) due to the strong N≡N bond (945 kJ mol−1). Electrochemical synthesis (ES) routes in this regard offer a milder approach. However, ES of ammonia under different temperatures, utilizing different electrolytes and catalysts has not yet reliably produced ammonia at viable rates and efficiencies. We report an origami-like Mo2C cathode catalyst for NRR that achieved a maximum synthesis rate of 2.16 × 10−11 mol cm−2 s−1 and a faradaic efficiency of 1.8% at 30 °C using Nafion-212 as electrolyte. Origami-like morphology containing numerous kinks appears to improve electrocatalytic activity and show a promising route for fabricating NRR catalysts with higher catalytic activity.

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Introduction to Active Origami Structures

Cited by 8 publications

References 228 publications

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Programmable self-foldable films for origami-based manufacturing

Molybdenum Carbide Electrocatalysts for Electrochemical Synthesis of Ammonia from Nitrogen: Activity and Stability

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