Journal Article10.1016/J.SNA.2015.11.026
Comparison of mold designs for SMA-based twisting soft actuator
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TL;DR: In this paper, two molds design strategies are proposed that enable three distinct approaches to improve the performance of this actuator: interference fit fastening molds and using intermediate elements to reorient the SMA wires.
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Abstract: The design of SMA-based soft actuators is often limited by the design of the molds used, and these limitations are even more pronounced for actuators with complex shape memory alloy (SMA) wire positioning such as SMA-based twisting soft actuators. This paper aims at developing new mold designs to enable new design possibilities for the fabrication of pure-twisting smart soft composite (SSC) actuators. The basic design of the actuator uses two SMA wires embedded in a polymeric matrix at opposite eccentricity and crossing the matrix in opposite directions. This positioning induces a twisting motion to the matrix during actuation, but current mold designs impose many limitations on the design of the actuator. In this work, two molds design strategies are proposed that enable three distinct approaches to improve the performance of this actuator: interference fit fastening molds and using intermediate elements to reorient the SMA wires. These solutions enable the design of I-shaped cross-sections, composite cross-sections and square-helix positioning of the SMA wires within the matrix. A base actuator size is used to compare the performance of the different strategies then three actuators using combined solutions are manufactured and tested. Results show that the improved mold design can significantly increase the performance of this type of actuator.
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Citations
Variable stiffness mechanism of flexible composite laminates implanted with modular SMAHC
TL;DR: The variable stiffness mechanism of flexible composite laminates implanted with modular SMAHC is studied. The stiffness of the composite plates is negatively correlated with SMA fiber diameter and positively correlated with SMA fiber volume fraction. With an increase in driving temperature, the stiffness of the composite plates tends to decrease.
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Shape-reversible 4D printing aided by shape memory alloys
01 Jan 2022
TL;DR: In this paper , a two-way bending actuator with bilayer hinges consisting of stiff SMPs as well as elastomers with low modulus was designed to bend, maintain the deformed shape and recover the as-fabricated shape.
2
Shape Memory Alloys Patches to Mimic Rolling, Sliding, and Spinning Movements of the Knee
Suyeon Seo,Minchae Kang,Min-Woo Han +2 more
TL;DR: The proposed artificial-skeletal-model-based knee-joint-mimicking system appears to be applicable for analyzing skeletal models of knee patients and developing surgical simulation equipment for artificial joint replacement surgery.
1
Study on Actuation Characteristics of NiTiCu SMA Thin Film Deposited on Flexible Substrate
S. Jayachandran,A. Brolin,M. Harivishanth,K. Akash,I. A. Palani +4 more
- 01 Jan 2019
TL;DR: In this article, the authors studied the actuation of NiTiCu Shape Memory Alloy (SMA) bimorphs using Joule heating setup and found that the maximum displacement was found at 4 V and 3 A which was about 1.2 mm.
Design and Performance of a Pneumatic-Based Expanding Torsional Soft Spring Actuator
TL;DR: The soft robotics field, known to have actuators and systems with a simple manufacturing process, being lightweight and safe to interact with humans, is in constant expansion as mentioned in this paper , and present actuators have excessive unwanted deformations which greatly affects the system.
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