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Journal articles on the topic 'Shapes memory alloy'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Yang, Kaike, Junpeng Luo, Zhaoting Yuan, et al. "Topology Optimization of Shape Memory Alloy Actuators for Prescribed Two-Way Transforming Shapes." Actuators 13, no. 2 (2024): 65. http://dx.doi.org/10.3390/act13020065.

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This paper proposes a new topology optimization formulation for obtaining shape memory alloy actuators which are designed with prescribed two-way transforming shapes. The actuation behaviors of shape memory alloy structures are governed by austenite-martensite phase transformations effected by thermal-mechanical loading processes; therefore, to realize the precise geometric shape variations of shape memory alloy actuators, traditional methods involve iteration processes including heuristic structural design, numerical predictions and experimental validation. Although advanced structural optimi

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2

Kubášová, Kristýna, Veronika Drátovská, Monika Losertová, et al. "A Review on Additive Manufacturing Methods for NiTi Shape Memory Alloy Production." Materials 17, no. 6 (2024): 1248. http://dx.doi.org/10.3390/ma17061248.

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The NiTi alloy, known as Nitinol, represents one of the most investigated smart alloys, exhibiting a shape memory effect and superelasticity. These, among many other remarkable attributes, enable its utilization in various applications, encompassing the automotive industry, aviation, space exploration, and, notably, medicine. Conventionally, Nitinol is predominantly produced in the form of wire or thin sheets that allow producing many required components. However, the manufacturing of complex shapes poses challenges due to the tenacity of the NiTi alloy, and different processing routes at elev

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Liu, Bingfei, and Yaxuan Pan. "Effect of Pore Shape on Mechanical Properties of Porous Shape Memory Alloy." Micromachines 13, no. 4 (2022): 566. http://dx.doi.org/10.3390/mi13040566.

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Porous shape memory alloys (SMAs) have been widely used in the aerospace, military, medical, and health fields due to its unique mechanical properties such as superelasticity, biocompatibility, and shape memory effect. In this work, the pore shape was considered in the constitutive model of the porous SMAs by respectively introducing the parameter of aspect ratio and for different pore shapes including oblate, sphere, and prolate shapes, so the expression of Young’s modulus for the porous SMA can be derived. Then, the constitutive model for such a porous shape memory alloy was established. Whe

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de Brito Simões, Jackson, Francisco Fernando Roberto Pereira, Jorge Otubo, and Carlos José de Araújo. "Influence of Heat Treatments on a NiTi Shape Memory Alloy Obtained Using Vacuum Induction Melting and Reprocessed by Plasma Skull Push-Pull." MRS Proceedings 1765 (2015): 121–26. http://dx.doi.org/10.1557/opl.2015.817.

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ABSTRACTShape memory alloys (SMA) are metallic attractive engineering materials due to their capacity to store pre-defined shapes through a thermally induced phase transition from a solid state. This paper aims to evaluate the influence of solubilization thermal treatments on a NiTi shape memory alloy originally fabricated by vacuum induction melting and then reprocessed by plasma melting followed by injection molding (Plasma Skull Push Pull process) into different metal molds (steel, aluminum, brass and copper) in order to compare the thermal properties regarding to its raw state. The thermal

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Kitamura, Kazuhiro. "Shape Memory Properties of Ti-Ni Shape Memory Alloy / Shape Memory Polymer Composites Using Additive Manufacturing." Materials Science Forum 1016 (January 2021): 697–701. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.697.

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Shape memory alloys (SMAs) have the disadvantage that cooling is difficult and the actuating speed during cooling is slow. To resolve this problem, shape memory material actuators that operate only with heating is required. SMAs are characterized by a low apparent Young's modulus below the transformation temperature and a strong shape recovery force above the reverse transformation temperature. Alternatively, shape memory polymers (SMPs) have two properties: shape fixability and shape recovery. The SMPs are hardened below the glass transition (Tg) temperature and the material is recovered to m

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Traleski, André Victor, Selauco Vurobi Jr., and Osvaldo Mitsuyuki Cintho. "Processing of Cu-Al-Ni and Cu-Zn-Al Alloys by Mechanical Alloying." Materials Science Forum 727-728 (August 2012): 200–205. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.200.

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The mechanical alloying process provides alloys with extremely refined microstructure, reducing the need for alloying elements to grain growth restriction, as in casting techniques. The Cu-Al-Ni and Cu-Zn-Al alloys produced by casting may have the shape memory effect when plastically deformed at relatively low temperatures, returning to its original shape upon heating at a given temperature. This work aimed at the production of Cu-Al-Ni and Cu-Zn-Al alloys by mechanical alloying, followed by microstructural characterization and investigation of the shape memory effect by means of differential

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Saravanos, Dimitris, Theodoros Machairas, Alex Solomou, and Anargyros Karakalas. "Shape Memory Alloy Morphing Airfoil Sections." Advances in Science and Technology 101 (October 2016): 112–20. http://dx.doi.org/10.4028/www.scientific.net/ast.101.112.

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Shape memory alloys (SMA) provide common solid state actuators with reliable and unique characteristics. Their special behavior is based on a reversible phase transformation and can provide high power density, induced strain and block force which render them indispensable for use in morphing structures that require large shape changes while space and weight restrictions are imposed. Yet, their implementation into morphing structures faces challenges related to their complex multi-disciplinary behavior, their interaction with the passive structural components, geometrical nonlinearity due to la

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Spaggiari, Andrea, and Eugenio Dragoni. "Analytical modelling of Rolamite mechanism made of shape-memory alloy for constant force actuators." Journal of Intelligent Material Systems and Structures 28, no. 16 (2016): 2208–21. http://dx.doi.org/10.1177/1045389x16667560.

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This article analyses the Rolamite architecture exploiting shape-memory alloys as power element to obtain a solid-state actuator. The Rolamite mechanism was discovered in the late 1960s, initially as precision and low friction linear bearing. The most common Rolamite configuration consists of a flexible thin metal strip and two rollers mounted between two fixed parallel guide surfaces. The system can roll back and forth without slipping guided by the plates along its so-called sensing axis. The system presents another relevant advantage in addition to low friction coefficient, which is the pos

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9

Adiguzel, Osman. "Phase Transitions and Elementary Processes in Shape Memory Alloys." Advanced Materials Research 1101 (April 2015): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amr.1101.124.

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Shape memory effect is a peculiar property exhibited by certain alloy systems, and shape memory alloys are recognized to be smart materials. These alloys have important ability to recover the original shape of material after deformation, and they are used as shape memory elements in devices due to this property. The shape memory effect is facilitated by a displacive transformation known as martensitic transformation. Shape memory effect refers to the shape recovery of materials resulting from martensite to austenite transformation when heated above reverse transformation temperature after defo

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CIURCĂ, Lenuța, Bogdan PRICOP, Mihai POPA, Victor Daniel APOSTOL, and Leandru-Gheorghe BUJOREANU. "On the Free Recovery Bending Shape Memory Effect in Powder Metallurgy FeMnSiCrNi." Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 44, no. 3 (2021): 5–11. http://dx.doi.org/10.35219/mms.2021.3.01.

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This paper presents the results of an original experimental study on the training capacity of a powder metallurgy (PM) FeMnSiCrNi shape memory alloy (SMA). The specimens were sintered under protective atmosphere from blended elemental powders, 50 vol.%. of alloy particles being mechanically alloyed. Lamellar specimens, hot rolled to 1 mm thickness, were bent against cylindrical calibres with five decreasing radii, to induce cold shapes with higher and higher deformation degree, as compared to the straight hot shape. During the training procedure, bent specimens were heated with a hot air gun,

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Gopalakrishnan, T., M. Chandrasekaran, R. Saravanan, and P. Murugan. "An Ample Review on Compatibility and Competence of Shape Memory Alloys for Enhancing Composites." Advances in Materials Science and Engineering 2022 (October 3, 2022): 1–15. http://dx.doi.org/10.1155/2022/6988731.

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The name shape memory alloy (SMA) reveals its behavior of being an accurate heat-sensitive material in changing its shape based on the temperature. This ample review concentrates on the current scenario of including SMA in polymer matrix composites to achieve desired objectives. Polymer-based shape memory alloys are termed shape memory polymers (SMP), and they consist of deformable materials that are able to switch between their original shapes and temporary shapes, which can be generously designed. SMPs could be classified as smart materials by considering their low density, good biocompatibi

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Plăcintă, Constantin, Sergiu Stanciu, Mirela Panainte-Lehadus, et al. "Theoretical and Experimental Designs on Several Mechanical Properties of Cu–Al–Zn Shape Memory Alloys Used in the Processing Industry." Materials 16, no. 4 (2023): 1441. http://dx.doi.org/10.3390/ma16041441.

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By assimilating shape memory alloys with mathematical multifractal-type objects, a theoretical model based on Scale Relativity Theory in the form of The Multifractal Theory of Motion, in order to explain the mechanical behavior of such material, is proposed. The model is validated by analyzing the mechanical behavior of Cu–Al–Zn shape memory alloy with various chemical compositions. More precisely, the multifractal tunnel effect can “mime” the mechanical hysteresis of such a material, a situation in which a direct correspondence for several mechanical properties of Cu–Al–Zn is highlighted (the

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Kim, Taeyoon, Dohyung Kim, Wookjin Lee, and Wangryeol Kim. "Microstructure, Recovery Stress and Mechanical Property of Direct Energy Deposition Welded Fe-Mn-Si Based Shape Memory Alloy." Korean Journal of Metals and Materials 62, no. 12 (2024): 935–43. https://doi.org/10.3365/kjmm.2024.62.12.935.

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Direct Energy Deposition (DED) is one of the main methods of additive manufacturing in which a feedstock material in the form of powder or wire is delivered to a substrate while an energy source, such as laser beam or electron beam, is simultaneously applied to melt the feedstock. In addition to fabricating complex three-dimensional shapes using computer aided design, the DED laser welding process can be employed to fill complex shaped gaps between two objects. In this study, 3 mm thick Fe-based shape memory alloy plates with a 45° groove were welded by DED using high manganese steel powder fi

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Takashima, Kazuto, Hidetaka Suzuki, Toshiki Imazawa, and Hiroki Cho. "Motion Evaluation of Variable-Stiffness Link Based on Shape-Memory Alloy and Jamming Transition Phenomenon." Journal of Robotics and Mechatronics 36, no. 1 (2024): 181–89. http://dx.doi.org/10.20965/jrm.2024.p0181.

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In rapidly aging societies, the application of robots has spread from industry to nursing and social welfare. As the designs of industrial and non-industrial robots are different, numerous robot components with various shapes and stiffness are required for different tasks. In this study, we attached a variable-stiffness link based on a shape-memory alloy (SMA) and the jamming transition phenomenon to a robot arm and evaluated its pick-and-place motion for various objects with different shapes and weights. The link can be fixed in an arbitrary shape and then restored to its initial shape via th

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15

Takami, M., K. Fukui, S. Saitou, I. Sugiyama, and K. Terayama. "Application of a shape memory alloy to hand splinting." Prosthetics and Orthotics International 16, no. 1 (1992): 57–63. http://dx.doi.org/10.3109/03093649209164309.

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This paper describes new passive splints which have been developed using a shape memory alloy. The peculiar feature of the splints is that the way in which they change shape in use conforms to the stretching motion which it would be desirable to apply in certain conditions of deformity. The alloy consists of 55.66% by weight Nickel and 44.34% Titanium. The heat treatment of the alloy for memorising shape was implemented at 500°C for one hour. This alloy was easily bent when cool, but the original shape was recovered on heating. It was used as the supporting structure of the reverse knuckle ben

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Keshtta, Alaa, and Mohamed A. H. Gepreel. "Superelasticity Evaluation of the Biocompatible Ti-17Nb-6Ta Alloy." Journal of Healthcare Engineering 2019 (January 8, 2019): 1–8. http://dx.doi.org/10.1155/2019/8353409.

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Recently, studying the shape memory effect of the biocompatible Ti alloys takes much attention in the biomedical and healthcare applications. This study concerns about characterizing the superelasticity of the new biocompatible Ti-17Nb-6Ta (TNT) alloy. Microstructure of TNT was observed using optical and confocal microscopes. The alloy consists of two phases: β (predominant phase) and α″ martensite phase. The influence of cold rolling deformation on the microstructure was illustrated in which the martensitic-induced transformation appeared by cold rolling. The alloy is ductile as only the frac

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Yoshida, Eiichi, Shigeru Kokaji, Satoshi Murata, Kohji Tomita, and Haruhisa Kurokawa. "Miniaturization of Self-Reconfigurable Robotic System using Shape Memory Alloy Actuators." Journal of Robotics and Mechatronics 12, no. 2 (2000): 96–102. http://dx.doi.org/10.20965/jrm.2000.p0096.

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This paper presents a small-size self-reconfigurable modular machine using shape memory alloy (SMA). The system is designed so that various shapes can be actively formed by a group of identical mechanical units. Each mechanical unit realizes two-dimensional rotational motion by using a novel actuator mechanism composed of two SMA torsion springs which can generate sufficient motion range and torque. The size and the weight of a unit are approximately 5[cm] cube and 80[g]. The reconfiguration motion of the machine is verified by many-unit experiments. Applicability of the developed unit model t

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18

Hsu, Chih Yu. "Shape Memory Alloy Combined with Piezoelectric Materials Applied for Structure Vibration Control." Advanced Materials Research 47-50 (June 2008): 29–32. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.29.

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A new configuration of smart structures which could be automatically adjusted according to changes of forcing frequencies is proposed for vibration suppression. The new configuration is a laminated beam-plate or wide beam composed of layers of piezoelectric sensors and actuators and Shape Memory Alloy (SMA) wires embedded in the middle plane of the laminated structure. The structural natural frequencies can be adjusted closely to the forcing frequencies by adjusting electric heating for controlling temperature of SMA. In each layer, the piezoelectric sensors and actuators whose electrode are t

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Semba, Hiromasa, Nagatoshi Okabe, Toru Yamaji, Keisuke Okita, and Kiyoshi Yamauchi. "Axial Compressive Behavior of Single-Stage Bellows of TiNi Shape Memory Alloy for Seismic Applications." Materials Science Forum 475-479 (January 2005): 2055–58. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2055.

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The bellows formed of TiNi shape memory alloy (SMA) is proposed as a new type of seismic protection device. The bellows structure is known to have lower rigidity along the axial direction through effect of its shape. TiNi is known to be one of the most typical SMAs, which have high damping characteristics for dynamics engaged in its twin formation under martensite state and have the ability to recover completely from the large strain after unloaded and or heated. In this study, fundamental compressive behavior of TiNi bellows was investigated and discussed. Several shapes of TiNi single-stage

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Kim, Chul, S. Hyun, and M. H. Cho. "Behaviors of Shape Memory Alloy Wire Embedded Smart Composite Skins and Actuators." Key Engineering Materials 261-263 (April 2004): 1463–68. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1463.

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The shape changes by bending and twisting of a SMA/composite panel with embedded SMA wire actuators controlled by both electric resistive heating and passive elastic tailoring are investigated to realize the morphing wing of unmanned aerial vehicles. Three-dimensional finite element formulations are derived and used to analyze the behaviors of the SMA/composite smart structures. The numerical results show that the shapes of the SMA/composite panels can be controlled by judicious choices of control temperatures, SMA angles, and elastic tailoring. To validate the analytical results, two SMA-embe

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Mahmood Baitab, Danish, Dayang Laila Abang Haji Abdul Majid, Ermira Junita Abdullah, and Mohd Faisal Abdul Hamid. "A review of techniques for embedding shape memory alloy (SMA) wires in smart woven composites." International Journal of Engineering & Technology 7, no. 4.13 (2018): 129. http://dx.doi.org/10.14419/ijet.v7i4.13.21344.

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Metallic structures, in various industrial fields such as transport and aerospace, are mostly replaced by composite structures having less weight and good strength. There is also a need of intensification of the operational dynamic environment with high durability requirements. So a smart composite structure is required that can manifest its functions according to environmental changes. One method of producing smart composite structures is to embed shape memory alloys in composite structures. Shape memory alloys (SMAs) have significant mechanical and thermodynamic properties and are available

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Abdulkadhim, Hassan, Abdulkareem Hassan, and Ali Abdulaali. "2-D Actuator based Shape Memory Alloy using PID controller." Basrah journal for engineering science 22, no. 1 (2022): 1–8. http://dx.doi.org/10.33971/bjes.22.1.1.

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Over the past years, researchers have been focusing on development the robotics and actuation due to increase demand for these applications like industrial engineering, oil industry, healthcare, aerospace … etc. This work involves the design, construction and control of the Shape Memory Alloy (SMA) actuator. The industrial actuator has many characteristics able to be measured, which have an impact on the efficiency and effectiveness of the actuator while the execution of its tasks. The most important measurable characteristics are repeatability and accuracy. The current system typically is usi

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Zhao, Ying, and Minoru Taya. "Analytical Modeling for Stress-Strain Curve of a Porous NiTi." Journal of Applied Mechanics 74, no. 2 (2006): 291–97. http://dx.doi.org/10.1115/1.2198250.

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Two models for predicting the stress-strain curve of porous NiTi under compressive loading are presented in this paper. Porous NiTi shape memory alloy is considered as a composite composed of solid NiTi as matrix and pores as inclusions. Eshelby’s equivalent inclusion method and Mori-Tanaka’s mean-field theory are employed in both models. Two types of pore connectivity are investigated. One is closed cells (model 1); the other is where the pores are interconnected to each other forming an open-cell microstructure (model 2). We also consider two different shapes of pores, spherical and ellipsoi

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Khismatullin, Arthur, Oleg Panchenko, Dmitry Kurushkin, Ivan Kladov, and Anatoly Popovich. "Functional and Mechanical Properties of As-Deposited and Heat Treated WAAM-Built NiTi Shape-Memory Alloy." Metals 12, no. 6 (2022): 1044. http://dx.doi.org/10.3390/met12061044.

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In this work, MIG process was utilized for the wire arc additive manufacturing of the wall-shaped parts, using NiTi shape-memory alloy. High-scale specimens consisting of 20 layers were deposited by using Ni-rich (Ni55.56Ti wt.%) wire as a feedstock on the NiTi substrate with the identical chemical composition. One of two specimens was heat-treated at a temperature of 430 °C for 1 h. The influence of such a heat treatment on the microstructure, phase transformation temperatures, chemical and phase compositions, microhardness, and tensile and bending tests’ results is discussed. As-deposited me

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Uthira Kumar, B., D. S. Robinson Smart, M. Ramachandran, and Vimala Saravanan. "Influence of Chemical Treatment of Natural Fibre using Shape Memory Alloy for Aeronautics." Journal on Electronic and Automation Engineering 2, no. 2 (2023): 11–19. http://dx.doi.org/10.46632/jeae/2/2/4.

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This article offers a thorough review of shape memory alloys' (SMAs') uses in the Space research field. The utility of SMAs in a variety of applications, including morphing wings (using both experimental and modelling methods), customising orientation and inlet shapes for various propulsion systems, implementing flexible chevrons to improve thrust while lowering noise, and reducing overall power consumption, is the main topic of this paper. The use of SMAs in applications in space is also covered in the paper, including how they may be used to create low-shock launchers, isolate micro-vibratio

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Shin, Jin, Ye-Ji Han, Ju-Hee Lee, and Min-Woo Han. "Shape Memory Alloys in Textile Platform: Smart Textile-Composite Actuator and Its Application to Soft Grippers." Sensors 23, no. 3 (2023): 1518. http://dx.doi.org/10.3390/s23031518.

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In recent years, many researchers have aimed to construct robotic soft grippers that can handle fragile or unusually shaped objects without causing damage. This study proposes a smart textile-composite actuator and its application to a soft robotic gripper. An active fiber and an inactive fiber are combined together using knitting techniques to manufacture a textile actuator. The active fiber is a shape memory alloy (SMA) that is wire-wrapped with conventional fibers, and the inactive fiber is a knitting yarn. A knitted textile structure is flexible, with an excellent structure retention abili

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Tarnowski, Michał, Justyna Witkowska, Jerzy Morgiel, et al. "Formation of Nitrogen Doped Titanium Dioxide Surface Layer on NiTi Shape Memory Alloy." Materials 14, no. 6 (2021): 1575. http://dx.doi.org/10.3390/ma14061575.

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NiTi shape memory alloys are increasingly being used as bone and cardiac implants. The oxide layer of nanometric thickness spontaneously formed on their surface does not sufficiently protect from nickel transition into surrounding tissues, and its presence, even in a small amount, can be harmful to the human organism. In order to limit this disadvantageous phenomenon, there are several surface engineering techniques used, including oxidation methods. Due to the usually complex shapes of implants, one of the most prospective methods is low-temperature plasma oxidation. This article presents the

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Alhamdi, Ismail, Anwar Algamal, Abdalmageed Almotari, Majed Ali, Umesh Gandhi, and Ala Qattawi. "Fe-Mn-Al-Ni Shape Memory Alloy Additively Manufactured via Laser Powder Bed Fusion." Crystals 13, no. 10 (2023): 1505. http://dx.doi.org/10.3390/cryst13101505.

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Fe-Mn-Al-Ni is an Fe-based shape memory alloy (SMA) featuring higher stability and low temperature dependency of superelasticity stress over a wide range of temperatures. Additive manufacturing (AM) is a promising technique for fabricating Fe-SMA with enhanced properties, which can eliminate the limitations associated with conventional fabrication and allow for the manufacture of complicated shapes with only a single-step fabrication. The current work investigates the densification behavior and fabrication window of an Fe-Mn-Al-Ni SMA using laser powder bed fusion (LPBF). Experimental optimiza

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Liu, Mingfang, Lina Hao, Wei Zhang, and Zhirui Zhao. "A novel design of shape-memory alloy-based soft robotic gripper with variable stiffness." International Journal of Advanced Robotic Systems 17, no. 1 (2020): 172988142090781. http://dx.doi.org/10.1177/1729881420907813.

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Soft robotic grippers with compliance have great superiority in grabbing objects with irregular shape or fragility compared with traditional rigid grippers. The main limitations of such systems are small grasping force resulted from properties of soft actuators and lacking variable stiffness of soft robotic grippers, which prevent them from a larger wide range of applications. This article proposes a shape-memory alloy (SMA)-based soft gripper with variable stiffness composed of three robotic fingers for grasping compliantly at low stiffness and holding robustly at high stiffness. Each robotic

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Komarov, Victor, Roman Karelin, Irina Khmelevskaya, et al. "Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation." Materials 16, no. 2 (2023): 511. http://dx.doi.org/10.3390/ma16020511.

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The effect of a promising method of performing a thermomechanical treatment which provides the nanocrystalline structure formation in bulk NiTi shape memory alloy samples and a corresponding improvement to their properties was studied in the present work. The bi-axial severe plastic deformation of Ti-50.7at.%Ni alloy was carried out on the MaxStrain module of the Gleeble system at 350 and 330 °C with accumulated true strains of e = 6.6–9.5. The obtained structure and its mechanical and functional properties and martensitic transformations were studied using DSC, X-ray diffractometry, and TEM.

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SEMBA, HIROMASA, NAGATOSHI OKABE, TORU YAMAJI, KEISUKE OKITA, and KIYOSHI YAMAUCHI. "DYNAMIC BEHAVIOR OF SINGLE-STAGE BELLOWS OF TITANIUM-NICKEL SHAPE MEMORY ALLOY UNDER CYCLIC LOADING." International Journal of Modern Physics B 20, no. 25n27 (2006): 3944–49. http://dx.doi.org/10.1142/s0217979206040635.

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The dynamic behavior of TiNi shape memory alloy (SMA) bellows is examined in light of its potential use as elements in seismic protection devices. Dynamic property results obtained from cyclic tests under tension-compression loading of TiNi SMA single-stage bellows, with different shapes and with different heat treatments, are reported as a function of displacement amplitude and frequency. It was found that the displacement–force loops were almost symmetric with respect to the central point for almost all specimens. The normalized secant stiffness diminishes significantly with increasing bulge

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Hamed, Nagham M., and Saeed Naif Turki Al-Rashid. "Synthesis, Structure and Optical Properties of NiTi Shape Memory Thin Films." International Journal of Nanoscience 20, no. 02 (2021): 2150015. http://dx.doi.org/10.1142/s0219581x21500150.

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NiTi Shape Memory Alloy (SMA) is now widely used in important applications due to its shape memory effect (SME) and biocompatibility. However, there is still a challenge to control the sizes and shapes of these nanoparticles. Here, we report on the use of pulsed laser deposition technique for the cultivation of NiTi nanoparticles on glass substrates. It discussed the implications of the case of the influence of depositing laser energy on the size of a grain of NiTi nanoparticle. The nominated effect on the optical properties of its thin-film was also discussed. X-ray diffraction (XRD) analysis

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Mahesh, K. K., and F. M. Braz Fernandes. "Phase transformations in Ni-Ti SMA spring." Journal of Physics: Conference Series 2603, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1742-6596/2603/1/012017.

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Abstract Equi-atomic Nickel-Titanium (Ni-Ti) alloy is one of the prominent materials to exhibit two way shape memory effect (TWSME). Since the material by itself can change shape due to variation in temperature, it is also used as an actuator. In the present study, Ni-Ti (49.5at%Ni-Ti) alloy wire is converted into a spring coil with straight portions on either ends by shape setting. Training is provided to the spring coil portion to achieve TWSME. Separate specimens from the spring and straight portions were extracted. Phase transformations were observed in the spring and straight portions dur

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Zhang, Qin, Liang Xu, Hao Chen, Zhou Li, Liwu Huang, and Sicheng Yi. "Research on a Novel Shape-Memory Alloy Artificial Muscle with Active and Passive Heat Dissipation." Actuators 14, no. 5 (2025): 248. https://doi.org/10.3390/act14050248.

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Due to their high energy density and favorable load-to-weight ratio, shape-memory alloy (SMA) materials are ideal actuation sources for soft robots. However, the relatively long cooling time of SMA wires in soft bodies limits their response speed. In this study, we designed and fabricated a novel SMA artificial muscle. When active heat absorption was enabled through thermoelectric modules and the evaporation/dehydration effects of hydrogels, the cooling rate of the SMA wires increased significantly. Simulation and experimental results demonstrate that with the proposed heat-dissipation scheme,

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Pinter, Pascal, Andreas Reeb, and Kay André Weidenmann. "The Influence of Stress and Heat on the Transformation Behaviour of NiTi for Actuator Applications in Extruded Aluminium Matrix Composites." Materials Science Forum 825-826 (July 2015): 205–12. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.205.

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The integration of functions in lightweight structures features great potential for future applications in diagnosis and control. The combination of shape memory wires or ribbons made of NiTi embedded in aluminium and manufactured by composite extrusion offers the possibility to produce a composite actuator material in a single production step. The extrusion process allows a wide range of shapes and provides higher versatility than actuators made of bi-metals. The transformation temperature of NiTi varies depending on the composition of the alloy, between -100 °C and 100 °C. However, NiTi can

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Sun, Longfei, Yiwen Lan, and Binghao Wang. "Anthropomorphic modular gripper finger actuated by antagonistic wire and shape-memory alloy (SMA) springs." Mechanical Sciences 15, no. 2 (2024): 601–11. http://dx.doi.org/10.5194/ms-15-601-2024.

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Abstract. The traditional underactuated grippers can only passively adapt to the contour of the object, and the passive contact process may lead to the object slipping, affecting the stability of the grasping process. In this paper, an anthropomorphic modular gripper finger actuated by antagonistic wire and shape-memory alloy (SMA) springs, which can actively control the grasping morphology according to the characteristics of the objects to be grasped, is proposed. The wire drive simulates the flexor muscle, and the SMA and reset springs simulate the extensor muscles of the finger, which antag

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Löffler, Robin, Stephan Tremmel, and Rüdiger Hornfeck. "Owl-Neck-Spine-Inspired, Additively Manufactured, Joint Assemblies with Shape Memory Alloy Wire Actuators." Biomimetics 8, no. 1 (2023): 117. http://dx.doi.org/10.3390/biomimetics8010117.

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Nature provides a considerable number of good examples for simple and very efficient joint assemblies. One example is the enormously flexible cervical spine of American barn owls, which consists of 14 cervical vertebrae. Each pair of vertebrae produces a comparatively small individual movement in order to provide a large overall movement of the entire cervical spine. The biomimetic replication of such joints is difficult due to the delicate and geometric unrestricted joint shapes as well as the muscles that have to be mimicked. Using X-ray as well as micro-computed tomography images and with t

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Chen, Xi, Lars Bumke, Eckhard Quandt, and Manfred Kohl. "Bistable Actuation Based on Antagonistic Buckling SMA Beams." Actuators 12, no. 11 (2023): 422. http://dx.doi.org/10.3390/act12110422.

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Novel miniature-scale bistable actuators are developed, which consist of two antagonistically coupled buckling shape memory alloy (SMA) beams. Two SMA films are designed as buckling SMA beams, whose memory shapes are adjusted to have opposing buckling states. Coupling the SMA beams in their center leads to a compact bistable actuator, which exhibits a bi-directional snap-through motion by selectively heating the SMA beams. Fabrication involves magnetron sputtering of SMA films, subsequent micromachining by lithography, and systems integration. The stationary force–displacement characteristics

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Bhagwatkar, Deepti, Faseeh Muhammed Bin Farookh, Bellamkonda Neeha Pavithra, Wajeeda Tabassum, Piyush Tiwari, and Bhawna Garg. "Nitinol advancements in endodontics: Heat treatment and surface functionalization of NiTi instruments." IP Indian Journal of Conservative and Endodontics 8, no. 3 (2023): 150–54. http://dx.doi.org/10.18231/j.ijce.2023.028.

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Nitinol, a nickel-titanium alloy known for its exceptional properties of shape memory, superelasticity, and biocompatibility, has revolutionized the field of endodontics. This article explores the evolutionary journey of Nitinol in endodontics, highlighting its historical inception and subsequent integration into dental instruments. The article delves into pivotal advancements such as heat treatment and surface functionalization, showcasing their transformative effects on the mechanical properties and biocompatibility of Nitinol instruments. The discussion encompasses terms related to NiTi fil

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Khalil, Ahmed Mohsen, Mohamed Elkafrawy, Rami Hawileh, and Mohammad Al-Hamaydeh. "Numerical Investigation on Improving Shear Strength of RC Beams with Various Web Opening Shapes Using Pre-Stressed Fe-SMA Bars." Key Engineering Materials 1004 (December 23, 2024): 13–22. https://doi.org/10.4028/p-e2xiev.

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The presence of web openings in the shear span significantly impacts the structural behavior of reinforced concrete (RC) beams, affecting both shear capacity and crack propagation. This study explores the feasibility of strengthening web openings in the shear zone of RC beams using iron-based shape memory alloy (Fe-SMA) bars through numerical analysis with ABAQUS software. The investigation considered various web opening shapes; diamond, circular, and square strengthened with pre-stressed Fe-SMA bars. Results showed that web openings notably decrease the ultimate loads of beams by 53%, 44%, an

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Su, X., and M. P. Cartmell. "Modifications to the response of a parametrically excited cantilever beam by means of smart active elements." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 8 (2009): 1579–91. http://dx.doi.org/10.1243/09544062jmes1956.

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This article is concerned with applying active smart material elements for modifying parametric vibration in a flexible composite beam structure. The glass epoxy beam is bonded to two theoretically prestrained shape memory alloy (SMA) strips and fitted with a lumped end mass. In this study, the components of the recovery force generated during the SMA activation are derived with respect to a three-dimensional frame when the structure is undergoing combined bending and torsional motions. In order to employ Lagrangian dynamics, the generalized forces are formulated and the equations of motion ar

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Benarrait, Racha, Muneeb Ullah-Khan, Jérémy Terrien, Hani Al Hajjar, Frédéric Lamarque, and Andreas Dietzel. "A Flexible Double-Sided Curvature Sensor Array for Use in Soft Robotics." Sensors 24, no. 11 (2024): 3475. http://dx.doi.org/10.3390/s24113475.

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This paper describes the design, fabrication, integration, characterization, and demonstration of a novel flexible double-sided curvature sensor array for use in soft robotics. The paper explores the performance and potential applications of a piezoresistive sensor array consisting of four gold strain gauges on a flexible polyimide (PI) substrate arranged in a Wheatstone bridge configuration. Multiple sensor strips were arranged like the fingers of a hand. Integrating Shape Memory Alloy (SMA) foils alongside the fingers was explored to mimic a human hand-gripping motion controlled with tempera

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Liu, Hongwei, Jiong Wang, and Hui-Hui Dai. "Analytical study on stress-induced phase transitions in geometrically graded shape memory alloy layers. Part II: Analyses on geometrical shapes, loading procedures and boundary conditions." Mechanics of Materials 112 (September 2017): 114–28. http://dx.doi.org/10.1016/j.mechmat.2017.05.014.

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Paton, B. E., D. M. Kaleko, S. N. Kedrovsky, Yu N. Koval, I. V. Krivtsun, and V. N. Slepchenko. "Resistance welding of shape-memory copper-aluminium alloy." Paton Welding Journal 2015, no. 12 (2015): 2–7. http://dx.doi.org/10.15407/tpwj2015.12.01.

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Nes, Cristian Sorin, Angelica Enkelhardt, Nicolae Faur, and Adrian Birlan. "Numerical Stress Intensity Factors Determination for Fabrication Defects in Coronary Stents." Key Engineering Materials 488-489 (September 2011): 718–21. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.718.

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Objectives: Numerical stress intensity factors (SIFs) computation for several fabrication defect geometries in coronary stents. XFEM crack initiation and propagation was also performed. Methods: The model represents a self-expandable coronary stent, made from a shape memory alloy (L-605). Several flaw shapes are considered. The analysis was performed using the ABAQUS code. The loads and boundary conditions simulate the interaction between the blood vessels and stents, immediately after the angioplasty was performed. The mesh contains 3d stress hexahedral elements. For global stress and strain

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MORALES S., Marcia, Hisaaki TOBUSHI, Kousuke DATE, and Kouji MIYAMOTO. "654 Bending Fatigue Properties of TiNi Shape Memory Alloy." Proceedings of Conference of Tokai Branch 2010.59 (2010): 373–74. http://dx.doi.org/10.1299/jsmetokai.2010.59.373.

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Perez-Sanchez, Vicente, Francisco Javier Garcia-Rubiales, Saeed Rafee Nekoo, Begoña Arrue, and Anibal Ollero. "Modeling and Application of an SMA-Actuated Lightweight Human-Inspired Gripper for Aerial Manipulation." Machines 11, no. 9 (2023): 859. http://dx.doi.org/10.3390/machines11090859.

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The increasing usage of multi-rotor aerial platforms and the reliability of flights enabled researchers to add equipment and devices to them for application. The addition of lightweight manipulators, grippers, and mechanisms to fulfill specific tasks has been reported frequently recently. This work pushes the idea one step ahead and uses an Artificial Human Hand (AHH) in an uncrewed aerial vehicle for aerial manipulation, device delivery, and co-operation with human workers. This application requires an effective end-effector capable of grasping and holding objects of different shapes. The AHH

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Ishida, Tohru, and Yoshimi Takeuchi. "Design and Implementation of Automatic Discharge Gap Controller for a Curved Hole Creating Microrobot with an Electrical Discharge Machining Function." International Journal of Automation Technology 4, no. 6 (2010): 542–51. http://dx.doi.org/10.20965/ijat.2010.p0542.

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This study deals with the development of a mechanism which can autonomously and automatically control the discharge gap for achieving electrical discharge machining (EDM) in an almost isolated space. This is so that a microrobot equipped with the mechanism can create a long, complicated curved hole, a hole that could not be formed by conventional machining methods. Holes formed by conventional machining methods are generally straight, so pipelines built in a variety of mechanical apparatuses consist of straight or polygonal lines. Such dearth of variety in realizable hole shapes can sometimes

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Wheat, C. Geoffrey, Christopher Kitts, Camden Webb, et al. "A new high-temperature borehole fluid sampler: the Multi-Temperature Fluid Sampler." Scientific Drilling 28 (December 1, 2020): 43–48. http://dx.doi.org/10.5194/sd-28-43-2020.

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Abstract. Deep (>1 km depth) scientific boreholes are unique assets that can be used to address a variety of microbiological, hydrologic, and biogeochemical hypotheses. Few of these deep boreholes exist in oceanic crust. One of them, Deep Sea Drilling Project Hole 504B, reaches ∼190 ∘C at its base. We designed, fabricated, and laboratory-tested the Multi-Temperature Fluid Sampler (MTFS), a non-gas-tight, titanium syringe-style fluid sampler for borehole applications that is tolerant of such high temperatures. Each of the 12 MTFS units collects a single 1 L sample at a predetermined temperat

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Sun, Longfei, and Huiying Gu. "Envelope Morphology of an Elephant Trunk-like Robot Based on Differential Cable–SMA Spring Actuation." Actuators 14, no. 2 (2025): 100. https://doi.org/10.3390/act14020100.

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Most trunk-like robots are designed with distributed actuators to mimic the envelope-grasping behavior of elephant trunks in nature, leading to a complex actuation system. In this paper, a modular underactuated elephant trunk-imitating robot based on the combined drive of the cable and shape memory alloy (SMA) springs is designed. Unlike the traditional underactuated structure that can only passively adapt to the envelope of the object contour, the proposed elephant trunk robot can control the cable tension and the equivalent stiffness of the SMA springs to achieve active control of the envelo

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