Article
Chemistry, Analytical
Jin Shin, Ye-Ji Han, Ju-Hee Lee, Min-Woo Han
Summary: In recent years, researchers have focused on developing robotic soft grippers that can handle fragile or unusually shaped objects without causing damage. This study introduces a smart textile-composite actuator for a soft robotic gripper. By combining an active fiber (a shape memory alloy) with an inactive knitting yarn using knitting techniques, a flexible and high-compliance textile actuator is manufactured. The actuator's driving source is the shape memory alloy wire, which deforms when heated. Experimental investigations were conducted to determine the optimal course-to-wale ratio, number of bundled SMA wires, and driving current value for maximum actuator deformation. The gripper was assembled using three actuators and evaluated through tests on various object shapes, demonstrating its ability to successfully lift flat, spherical, and uniquely shaped objects.
Article
Automation & Control Systems
Joey Z. Ge, Longlong Chang, Nestor O. Perez-Arancibia
Summary: Tensioned shape-memory alloy wires exhibit hysteresis loops due to the shape-memory effect (SME) under cyclic heating and cooling, with the deformation also dependent on loading stress. To achieve accurate position control of an SMA wire-actuator, the hysteretic phenomenon must be explicitly modeled and compensated using a Preisach-model-based approach. By utilizing forward mapping to identify parameters and employing an inversion algorithm for feedforward inverse control, the proposed scheme effectively addresses the hysteresis effects of SMA wires to enable precise position tracking.
Article
Mechanics
Lingzhen Li, Eleni Chatzi, Elyas Ghafoori
Summary: This study proposes a semi-analytical and semi-numerical model to describe the mechanical behavior of adhesively bonded joints between iron-based shape memory alloys and steel. The model is validated using experimental testing, and can estimate bond capacities and process bond-slip behavior directly from load-displacement curves. An experimental data processing protocol is also proposed to assess the full-range behavior of bonded joints.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Sadjad Baradari, Natalia Resnina, Sergey Belyaev, Mahmoud Nili-Ahmadabadi
Summary: This study investigates the structure, martensitic phase transformation behavior, and shape memory properties of quaternary and quinary Ni-Cu-Ti-Hf-Zr shape memory alloys in the as-cast state. Experimental results showed different shape memory performances among the alloys, with Ni44.8Cu5Ti45.2Hf5 alloy exhibiting the maximum shape memory strain of 6.2% and Ni45.5Cu5Ti39.5Hf5Zr5 alloy lacking the shape memory effect due to suppressed B2 ->B19' transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Saewoong Oh, Tae-Eun Song, Manmatha Mahato, Ji-Seok Kim, Hyunjoon Yoo, Myung-Joon Lee, Mannan Khan, Woon-Hong Yeo, Il-Kwon Oh
Summary: In this study, a wearable haptic auxetic fabric (WHAF) is developed by knotting shape-memory alloy wires into an auxetic-structured fabric. The WHAF expands and contracts in 3D, providing superior size-fitting and shape-fitting capabilities. It can convey cutaneous or kinesthetic feedback depending on the body part it is worn on, making it a multimodal wearable haptic interface.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
C. Lauhoff, A. Reul, D. Langenkaemper, P. Krooss, C. Somsen, M. J. Gutmann, B. Pedersen, I. V. Kireeva, Y. I. Chumlyakov, G. Eggeler, W. W. Schmahl, T. Niendorf
Summary: This study investigates the effects of aging treatments on the martensitic transformation and functional properties of Co-Ni-Ga shape memory alloys. The formation of nanoparticles is shown to strongly influence the selection and morphology of martensite, with larger particles promoting irreversibility and smaller particles enhancing functional stability.
Article
Physics, Applied
L. Galdun, R. Vidyasagar, M. Hennel, M. Varga, T. Ryba, L. Nulandaya, O. Milkovic, M. Reiffers, J. Kravcak, Z. Vargova, R. Varga
Summary: The experimental observation of the structural phase transformation in a non-stoichiometric shape memory Fe42.8Mn27.6Ga29.6 Heusler glass-coated microwire was found to be in good agreement with magnetic, permeability, and electrical resistance measurements, providing evidence for the shape memory effect. The glass-coated microwire can not only shift the transformation temperature with an external magnetic field, but also determine whether the alloy has undergone structural transformation based on its initial permeability value.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Geological
Xiaoshu Gao, Canxing Qiu, Hetao Hou, Cheng Chen, Desheng Ran
Summary: Shape memory alloys (SMAs) are widely used in developing self-centering (SC) structures due to their excellent super-elasticity. The seismic performance of SMA-based structures is influenced by the hysteretic parameters of SMAs, however, the uncertainties in these parameters have not received sufficient attention.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Adelaide Nespoli, Enrico Bassani, Elena Villa, Francesca Passaretti
Summary: This torsional device utilizes shape memory alloy elements to function as a torque limiter, with pseudoelastic NiTi tapes working in series configuration. By adjusting the number of tapes, the torque output can be tuned from pulsating to continuous. The temperature-dependent response enabled by NiTi material provides a stable cyclic response for the device.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Stefano Rodino, Giammarco Caroleo, Emanuele Sgambitterra, Fabio Bruno, Maurizio Muzzupappa, Carmine Maletta
Summary: Shape Memory Alloys (SMAs) are increasingly used in actuator technologies due to their shape recovery properties and reliability. However, dynamic effects caused by fast actuation can pose a threat to material integrity, requiring consideration of the thermal-mechanical response of SMA wires in design.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Physical
Miriam Battaglia, Andrea Sellitto, Angela Giamundo, Michele Visone, Aniello Riccio
Summary: This paper presents a numerical implementation of a comprehensive constitutive model for simulating the thermomechanical behavior of shape memory alloys. By implementing this model as a user subroutine in the FE code Abaqus/Standard, variations in material properties in complex components made of shape memory alloys can be accounted for. The potential of shape memory alloys in engineering applications is highlighted, and the ability to use them in complex systems with accurate simulations is demonstrated.
Article
Instruments & Instrumentation
Luke Mizzi, Seyedeh Farzaneh Hoseini, Marco Formighieri, Andrea Spaggiari
Summary: Shape memory alloys (SMA) are used in a novel SMA-metamaterial actuator to achieve a reversible, global elongation in multiple directions. The actuator consists of an SMA component, a bias component, and a metamaterial geometry that amplify and re-direct the unidirectional SMA actuation. A prototype actuator was tested in different configurations to demonstrate its functionality and reusability. A theoretical model was developed to predict the actuation stroke based on material properties and geometry, and was validated.
SMART MATERIALS AND STRUCTURES
(2023)
Review
Chemistry, Multidisciplinary
Min-Soo Kim, Jae-Kyung Heo, Hugo Rodrigue, Hyun-Taek Lee, Salvador Pane, Min-Woo Han, Sung-Hoon Ahn
Summary: Shape memory alloys (SMAs) are smart materials with high energy density, actuation strain, and biocompatibility characteristics, which are widely used in intelligent devices. This article summarizes the state-of-the-art thermal and magnetic SMA actuators, including their constituent materials, form, scaling effects, surface treatments, and functionalities. The motion performance of various SMA architectures is also analyzed. Current challenges and suggestions for advancing SMAs by considering material, form, and scale effects are emphasized.
ADVANCED MATERIALS
(2023)
Review
Construction & Building Technology
Iman Abavisani, Omid Rezaifar, Ali Kheyroddin
Summary: Shape memory materials (SMMs) are widely used in civil engineering due to their unique ability to memorize their original shape and return to it under stimuli. These materials, including shape memory alloys, magnetic shape memory alloys, shape memory polymers, and shape memory ceramics, have multifunctional properties and can be applied in various systems.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Emanuele Sgambitterra, Carlo Greco, Stefano Rodino, Fabrizio Niccoli, Franco Furgiuele, Carmine Maletta
Summary: A fully coupled electric-thermo-mechanical model is proposed to predict the thermal and mechanical response of Shape Memory Alloy (SMA) wires when electrically actuated. The model takes into account phase transformations, conduction and convective heat exchanges, as well as the dependency of resistivity on the thermo-mechanical parameters of the alloy. The results show that the proposed model accurately predicts the temperature evolution and actuation response of the wire, and can be used to evaluate the performance of SMA actuators.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
