Shape Memory Alloy (SMA) Actuators: The Role of Material, Form, and Scaling Effects

Kim, Min‐Soo; Heo, Junyoung; Rodrigue, Hugo; Lee, Kang-In; Han, Min‐Woo; Ahn, Sung‐Hoon

doi:10.1002/adma.202208517

Cited by 71 publications

(19 citation statements)

References 201 publications

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“…92,93 The underlying mechanism involves crystalline phase transformation which depends on temperature. 93 An SMA is shaped in a mold (in our case, a flat mold), annealed at high temperatures, and then quenched with water. They are easily deformed and tolerate high strain, which can be used to roll them even when integrated with a flexible solar panel.…”

Section: Thermally Actuated Shape-memory Alloy For Flexible Solar Cel...mentioning

confidence: 99%

“…SMAs are metal alloys that can be deformed when cold but return to their predeformed (“remembered”) shape when heated. , The underlying mechanism involves crystalline phase transformation which depends on temperature . An SMA is shaped in a mold (in our case, a flat mold), annealed at high temperatures, and then quenched with water.…”

Section: Thermally Actuated Shape-memory Alloy For Flexible Solar Cel...mentioning

confidence: 99%

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Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications

Angmo,

Yan,

Liang

et al. 2024

ACS Appl. Energy Mater.

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The thin physical profile of perovskite-based solar cells (PSCs) fabricated on flexible substrates provides the prospect of a disruptive increase in specific power (power-to-mass ratio), an important figure-of-merit for solar cells to be used in space applications. In contrast to recent reports on space applications of PSCs which focus on rigid glass-based devices, in this work we investigate the suitability of flexible PSCs for low-earth orbit (LEO) applications, where the perovskite layer in the PSCs was prepared using either a Ruddlesden−Popper precursor composition (BA 2 MA 3 Pb 4 I 13 ; BA = butylammonium, MA = m e t h y l a m m o n i u m ) o r a m i x e d -c a t i o n p r e c u r s o r c o m p o s i t i o n (Cs 0.05 FA 0.81 MA 0.14 Pb 2.55 Br 0.45 ; FA = formamidinium). The flexible PSC devices display a tolerance to high-energy proton (14 MeV) and electron (>1 MeV) radiation comparable with, or superior to, equivalent glass-based PSC devices. The photovoltaic performance of the PSCs is found to be significantly less dependent on angle-of-incidence than GaAs-based triple-junction solar cells commonly used for space applications. Results from a preliminary test of the robustness of the perovskite film when subjected to LEO-like thermal environments are also reported. In addition, a unique deployment concept integrating printed flexible solar cells with titanium−nickel based shape memory alloy ribbons is presented for thermally actuated deployment of flexible solar cells from a rolled state.

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Section: Thermally Actuated Shape-memory Alloy For Flexible Solar Cel...mentioning

confidence: 99%

Section: Thermally Actuated Shape-memory Alloy For Flexible Solar Cel...mentioning

confidence: 99%

Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications

Angmo,

Yan,

Liang

et al. 2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

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“…As depicted in figure 1, soft robots offer a variety of drive modes, encompassing pneumatic drive [11][12][13][14], shape memory alloy (SMA) drive [15][16][17][18], dielectric elastomer (DE) drive [19], external magnetic field drive [20], cable drive [21], permanent magnet drive [22], Electromagnetic Oscillatory Actuator (EOA) [23] and other physical drives. Additionally, they can be driven through chemical means by converting chemical energy into mechanical energy or by immersing the soft robot in a chemical solution to initiate a chemical reaction [24][25][26], among other techniques.…”

Section: Introductionmentioning

confidence: 99%

A walking soft robot driven by electromagnetism inside the body

Zhu,

Guo,

Zhang

et al. 2024

Eng. Res. Express

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Existing magnetically driven soft robots mainly rely on external electromagnetic, leading to a substantial energy consumption due to the requirement of a large external magnetic field. Moreover, the precise control of these soft robots relies on electric current, making them highly susceptible to disturbances and deviations induced by minute variations in the current. To overcome these challenges, we propose and evaluate a novel approach employing a miniature walking soft robot empowered by its internal electromagnets. The overall robot size is 18 mm × 6 mm × 12 mm (length × height× width). This design enables the robot to achieve precise and stable motion using a 240-mA current with a 6V low voltage. In addition, the incorporation of specially designed sheet-leg mechanism with varying degrees of friction facilitates the transformation of linear motion into an effective forward gait. This paper outlines the principles and control strategies of the robot, illustrates the robot fabrication process, at the same time verifies the structural integrity through experimental validation. Further evaluations include comprehensive analysis of the robot’s gait and speed. The results show that the robot attains a speed of 2.86mm/s. This study marks a stride towards the realization of a fully autonomous, unrestrained, cost-effective, and energy-conserving magnetic soft robot.

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“…Therefore, it has a significant advantage in the design of intelligent soft gripper. Furthermore, the soft grippers based on SMA wire also can simplify the conventional wire-actuated external actuation mechanism, and can achieve active actuation and recovery [31]. For example, it can solve the problem of response after actuation that proposed by Zhang et al [37] for soft gripper grasping with motor driven guide wire.…”

Section: Introductionmentioning

confidence: 99%

A fast actuated soft gripper based on shape memory alloy wires

Li,

Ma,

et al. 2024

Smart Mater. Struct.

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The application of shape memory alloy (SMA) actuated soft grippers is limited by their slow recovery speed. In order to further expand their application range, as one of the solutions to address this limitation, this paper proposes a fast actuated soft gripper based on shape memory alloy wire active heat dissipation and elastic rib combination to meet the rapid actuation and recovery. The structure primarily consists of a heat dissipation module capable of winding SMA wire and a soft structure resembling a scorpion tail with embedded supper elastic SMA wire. The geometric structure model, dynamics and SMA constitutive model and finite element model of the soft gripper are established, and the lateral deformation of soft bionic scorpion tail end is analyzed through simulations and experiments. In addition, the force in designed soft gripper tip and its ability to grasp different objects are also studied through experiments. The results show that the addition of a cooling fan increased the recovery rate by about 25%, and the force in soft bionic scorpion tail end can reach about 0.12 N. The designed soft gripper can successfully grasp objects with different softness, shape, size and weight. It lays a theoretical foundation and technical support for the development of soft grippers actuated by SMA in the future.

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Shape Memory Alloy (SMA) Actuators: The Role of Material, Form, and Scaling Effects

Cited by 71 publications

References 201 publications

Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications

Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications

A walking soft robot driven by electromagnetism inside the body

A fast actuated soft gripper based on shape memory alloy wires

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