Development of an actuated corrugated laminate for morphing structures

Airoldi, Alessandro; Rigamonti, Daniela; Sala, Giuseppe; Bettini, Paolo; Villa, Elena; Nespoli, Adelaide

doi:10.1017/aer.2020.70

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…The second configuration, on the other hand, involved the use of Teflon sleeves between the layers. In this way, the wire is totally free to actuate, even if the invasiveness is higher [33]. The total length of the NiTiNOL wire was almost 800 mm.…”

Section: Manufacturing and Testing Methodsmentioning

confidence: 99%

Hingeless arm for space robotics actuated through shape memory alloys

Biasutti,

Rigamonti,

Casciaro

et al. 2023

Bioinspir. Biomim.

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Operating outside the spacecraft via remotely controlled structures is an important opportunity in different space applications. The research in this area is focused on designing robots that are sufficiently flexible to allow inspection in locations where access is difficult or impossible for astronauts, while minimizing weight and bulk. The purpose of the research is to design a borescope for space applications with no hinges or other mechanisms, exploiting biomimetic design concepts. This is pursued by giving to the borescope a backbone exoskeleton provided by a continuous structure made of fibre reinforced composite material and using NiTi wires as tendons, taking advantage of their low weight and dimensions, which allow them to be embedded between the composite layers during the lamination process. After a study of the state of the art of flexible structures, concentrated in the medical and robotic fields, the research work unfolded in two phases. In the first design phase, several composite layup solutions were considered and analysed using finite element models, leading to the definition of the borescope geometrical parameters and to an initial estimate of the displacements that can be achieved. In the second experimental phase, seven prototypes were produced and tested, with one or more wires, to validate the design and to search for a configuration that can be actuated in different directions. The borescope prototypes resulted flexible enough to achieve an extended degree of bending and at the same time sufficiently rigid to allow complete rearm of the NiTi wires. The numerical and experimental study led to the definition of the design parameters, the number of wires, and the manufacturing technique to integrate NiTi actuators.

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Section: Manufacturing and Testing Methodsmentioning

confidence: 99%

Hingeless arm for space robotics actuated through shape memory alloys

Biasutti,

Rigamonti,

Casciaro

et al. 2023

Bioinspir. Biomim.

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“…As previously mentioned, the critical stress is required to activate the material. This criterion can be achieved in numerous different ways, either using passive elements such as dead weights, springs, compliant mechanisms [19], or using an active element such as an antagonistic SMA [6]. The most common method to create an SMA-powered actuator is to attach the smart material to a passive bias-spring [20].…”

Section: Bias-spring Actuatormentioning

confidence: 99%

Designing compliant mechanisms composed of shape memory alloy and actuated by induction heating

Thabuis¹,

Thomas²,

Martinez³

et al. 2021

Smart Mater. Struct.

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Shape memory alloys (SMAs) are a type of smart materials that reacts mechanically to heat. Due to their complex behavior, they are often used in a simple geometry such as wires. This constrains the output displacement of the alloy to a simple linear contraction of the wire. When a different output displacement is desired, the SMA is coupled to a mechanism that transforms the motion, degrading the compactness of the whole system. To alleviate such issues, we propose fabricating, directly in SMA, a compliant mechanism that performs complex output motions and thus improves integration. The first part of this paper presents a method to design such systems. When coupled with a bias-spring and a heating system, these mechanisms form a full actuator. The conventional heating system relies on Joules losses coming from direct electric conduction through the alloy. However, now that the SMA has a complex shape, passing a current through it becomes an arduous task requiring multiple electrodes making the system cumbersome and deteriorating its integrability. Magnetic induction heating is proposed to tackle this limitation, heating the mechanism without contact and conserving a compact actuator.

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“…Auxetic geometries, also known as re-entrant structures, show a unique behavior such that their Poisson's ratio is negative. It means that when these solids are compressed, they become smaller in the cross-section direction, or they respond with a complex flexure behavior [12][13][14][15]. Moreover, they are usually cellular structures, solids formed by an interconnected network of arms or plates forming edges or faces of a single cell that is spatially repeated [16].…”

Section: Introductionmentioning

confidence: 99%

Damping property of a NiTi auxetic structure fabricated through selective laser melting

Nespoli

Grande²,

Passaretti³

et al. 2023

Int J Adv Manuf Technol

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The present work aims at studying the damping response of a NiTi auxetic structure fabricated through additive manufacturing. Furthermore, an electropolishing route has been accounted for improving the roughness on the external surface of the printed samples. The damping capacity of the manufactured auxetic NiTi components is evaluated through the amount of energy dissipated per cycle and through the loss factor index. Results show that the damping capacity of the auxetic NiTi cell takes advantage of electropolishing and it is superior to that of traditional materials. Particularly, a maximum dissipated energy of 55 mJ was registered in the austenite state after 10 min of electropolishing; additionally, the loss factor shows a maximum of 0.0523 in the R-phase.

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Development of an actuated corrugated laminate for morphing structures

Cited by 6 publications

References 38 publications

Hingeless arm for space robotics actuated through shape memory alloys

Hingeless arm for space robotics actuated through shape memory alloys

Designing compliant mechanisms composed of shape memory alloy and actuated by induction heating

Damping property of a NiTi auxetic structure fabricated through selective laser melting

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