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Journal articles on the topic 'Superelastic'

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Author: Grafiati

Published: 4 June 2021

Last updated: 26 January 2023

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1

Li, Zhenxin, Yang Zhang, Kai Dong, and Zhongwu Zhang. "Research Progress of Fe-Based Superelastic Alloys." Crystals 12, no. 5 (April 25, 2022): 602. http://dx.doi.org/10.3390/cryst12050602.

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In recent years, superelastic alloys have become a current research hotspot due to the large recoverable deformation, which far exceeds the elastic recovery. This will create more possibilities in practical applications. At present, superelastic alloys are widely used in the fields of machinery, aerospace, transmission, medicine, etc., and become smart materials with great potential. Among superelastic alloys, Fe-based superelastic alloys are widely used due to the advantages of low cost, easy processing, good plasticity and toughness, and wide applicable temperature range. The research progress of Fe-based superelastic alloys are reviewed in this paper. The mechanism of thermoelastic martensitic transformation and its relation to superelasticity are summarized. The effects of the precipitate, grain size, grain orientation, and texture on the superelasticity of Fe-based superelastic alloys are discussed in detail. It is expected to provide a guide on the development and understanding of Fe-based superelastic alloys. The future development of Fe-based superelastic alloys are prospected.

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2

Li, Zhenxin, Yang Zhang, Kai Dong, and Zhongwu Zhang. "Research Progress of Fe-Based Superelastic Alloys." Crystals 12, no. 5 (April 25, 2022): 602. http://dx.doi.org/10.3390/cryst12050602.

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In recent years, superelastic alloys have become a current research hotspot due to the large recoverable deformation, which far exceeds the elastic recovery. This will create more possibilities in practical applications. At present, superelastic alloys are widely used in the fields of machinery, aerospace, transmission, medicine, etc., and become smart materials with great potential. Among superelastic alloys, Fe-based superelastic alloys are widely used due to the advantages of low cost, easy processing, good plasticity and toughness, and wide applicable temperature range. The research progress of Fe-based superelastic alloys are reviewed in this paper. The mechanism of thermoelastic martensitic transformation and its relation to superelasticity are summarized. The effects of the precipitate, grain size, grain orientation, and texture on the superelasticity of Fe-based superelastic alloys are discussed in detail. It is expected to provide a guide on the development and understanding of Fe-based superelastic alloys. The future development of Fe-based superelastic alloys are prospected.

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3

Ghazinejad, M., and Ali Shokuhfar. "Vibration Analysis of a Ni-Ti Shape Memory Alloy Rod." Materials Science Forum 553 (August 2007): 164–70. http://dx.doi.org/10.4028/www.scientific.net/msf.553.164.

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In this paper the effect of stress induced phase transformation on the vibration response of SMA structures has been studied. To this end, a Ni-Ti clamped-free rod in the superelastic range which is subjected to axial harmonic loading has been considered. Subsequently, the dynamic behavior of the superelastic rod has been analyzed using Auricchio’s superelastic model, which can reproduce the superelastic behavior of the sample during stress induced phase transformation, and Finite Element Method. Obtained Results show that due to the phase transformation the dynamic behavior of superelastic rod is highly nonlinear. Also, it can be deduced that superelastic components with large hysteresis loop has the potential for use in vibration attenuation of structures.

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4

Lipshatz, Jeff. "Superelastic wires." American Journal of Orthodontics and Dentofacial Orthopedics 102, no. 1 (July 1992): 14A—15A. http://dx.doi.org/10.1016/s0889-5406(05)80959-x.

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5

Ren, Wen Jie, Jun Sen Jia, and Xiang Shang Chen. "A New Constitutive Model of Superelastic SMA." Applied Mechanics and Materials 204-208 (October 2012): 3978–81. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3978.

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The shape memory alloys (SMAs) have received increasing interest attributed to their unique superelastic effect and the shape memory effect. The existing models of superelastic SMAs are generally complex for practical use. In this paper, cyclic loading tests of superelastic SMA wires are first performed. Based on the experiments, a simple constitutive model is set up. Simulations testify that the model can approximately describe the hysteretic characteristics of the superelastic SMA and the simulated mechanical parameters agree well with the experimental values.

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6

Kim, Hee Young, Keisuke Nakai, Jie Fu, and Shuichi Miyazaki. "Effect of Al addition on superelastic properties of Ti–Zr–Nb-based alloys." Functional Materials Letters 10, no. 01 (February 2017): 1740002. http://dx.doi.org/10.1142/s1793604717400021.

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The effects of Al addition on the superelastic properties of Ti–Zr–Nb alloys were investigated. Ti–18Zr–(12–16)Nb–(0–4)Al (at.%) alloys were prepared by the Ar arc melting method and superelastic properties, transformation temperature, and transformation strain were investigated quantitatively. The superelastic strain increased by the addition of Al and a large recovery strain of 6.1% was observed in a Ti–18Zr–13.5Nb–3Al alloy. The large superelastic strain of Al-added alloys was found to be due to a large transformation strain and a strong recrystallization texture.

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7

Li, Yingwei, Kangjie Chu, Chang Liu, Peng Jiang, Ke Qu, Peng Gao, Jie Wang, et al. "Superelastic oxide micropillars enabled by surface tension–modulated 90° domain switching with excellent fatigue resistance." Proceedings of the National Academy of Sciences 118, no. 24 (June 11, 2021): e2025255118. http://dx.doi.org/10.1073/pnas.2025255118.

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Superelastic materials capable of recovering large nonlinear strains are ideal for a variety of applications in morphing structures, reconfigurable systems, and robots. However, making oxide materials superelastic has been a long-standing challenge due to their intrinsic brittleness. Here, we fabricate ferroelectric BaTiO3 (BTO) micropillars that not only are superelastic but also possess excellent fatigue resistance, lasting over 1 million cycles without accumulating residual strains or noticeable variation in stress–strain curves. Phase field simulations reveal that the large recoverable strains of BTO micropillars arise from surface tension–modulated 90° domain switching and thus are size dependent, while the small energy barrier and ultralow energy dissipation are responsible for their unprecedented cyclic stability among superelastic materials. This work demonstrates a general strategy to realize superelastic and fatigue-resistant domain switching in ferroelectric oxides for many potential applications.

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8

Sprincenatu, Roxana, Madalin Condel, Sergiu Barbos, Andrei Novac, Ion Mitelea, and Corneliu Craciunescu. "Superelastic Behavior in NiTi Shape Memory Alloy Wires and Ribbons." Solid State Phenomena 254 (August 2016): 278–82. http://dx.doi.org/10.4028/www.scientific.net/ssp.254.278.

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Shape memory alloy ribbons in austenitic state were studied in a tensile testing machine in order to assess their superelastic behavior. They were compared with conventional materials and hair wire. The shape memoy alloy ribbon shows a particular behavior, with an ultimate tensile stress of about 1450 MPa reached at 9.5 % strain. The superelastic plateau was recorded around 590 MPa on loading and around 350 MPa on the unloading branch. Following multiple loading and unloading cycles, the superelastic behavior was not affected, nor was affected the ultimate tensile strength, that remained in the same range as for the one tested before cycling. The advantages of the superelastic ribbon compared to the ones of conventional materials are discussed. The superelastic properties of the ribbon are in the range of single crystals on what concerns the recoverable strains. This is attributed to the particular fine microstructure of the NiTi ribbon.

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9

WANG, MINGHUI, HONGLIU YU, BAOLIN LIU, LIANGFAN ZHU, and YUN LUO. "DESIGN OPTIMIZATION OF C-SHAPED SUPERELASTIC SMA SHEET WITH CONSTANT FORCE." Journal of Mechanics in Medicine and Biology 18, no. 01 (February 2018): 1750064. http://dx.doi.org/10.1142/s0219519417500646.

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Constant force component is very useful in medical device, such as forceps with constant force, which may prevent soft tissues from injures due to overloading. This paper studied the optimization procedure in constant force component for superelastic shape memory alloy, and tried to find the rule of obtaining constant force within a relatively large deformation range for superelastic C-shaped shape memory alloy sheet. The optimization concept of combing finite element analysis in ANSYS with genetic algorithm in MATLAB was presented for designing constant force component using superelastic SMA. The computational optimization and experimental results of the C-shaped shape memory alloy sheet showed that the proposed optimization method was potential for superelastic shape memory alloy. The optimization results were consistent with the experimental results. It was demonstrated that constant force could be obtained within a relatively large deformation range by varying the initial shape of the superelastic SMA component.

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10

Wang, Yan, Wei Chai, Zhi-Gang Wang, Yong-Gang Zhou, Guo-Qiang Zhang, and Ji-Ying Chen. "Superelastic Cage Implantation." Journal of Arthroplasty 24, no. 7 (October 2009): 1006–14. http://dx.doi.org/10.1016/j.arth.2008.07.010.

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11

Takamizawa, Satoshi, and Yasuhiro Miyamoto. "Superelastic Organic Crystals." Angewandte Chemie 126, no. 27 (May 5, 2014): 7090–93. http://dx.doi.org/10.1002/ange.201311014.

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12

Takamizawa, Satoshi, and Yasuhiro Miyamoto. "Superelastic Organic Crystals." Angewandte Chemie International Edition 53, no. 27 (May 6, 2014): 6970–73. http://dx.doi.org/10.1002/anie.201311014.

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13

Qian, Hui, Hongnan Li, Gangbing Song, and Wei Guo. "A Constitutive Model for Superelastic Shape Memory Alloys Considering the Influence of Strain Rate." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/248671.

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Shape memory alloys (SMAs) are a relatively new class of functional materials, exhibiting special thermomechanical behaviors, such as shape memory effect and superelasticity, which enable their applications in seismic engineering as energy dissipation devices. This paper investigates the properties of superelastic NiTi shape memory alloys, emphasizing the influence of strain rate on superelastic behavior under various strain amplitudes by cyclic tensile tests. A novel constitutive equation based on Graesser and Cozzarelli’s model is proposed to describe the strain-rate-dependent hysteretic behavior of superelastic SMAs at different strain levels. A stress variable including the influence of strain rate is introduced into Graesser and Cozzarelli’s model. To verify the effectiveness of the proposed constitutive equation, experiments on superelastic NiTi wires with different strain rates and strain levels are conducted. Numerical simulation results based on the proposed constitutive equation and experimental results are in good agreement. The findings in this paper will assist the future design of superelastic SMA-based energy dissipation devices for seismic protection of structures.

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14

Monogenov, A. A., M. R. Mukhamedov, V. I. Shtin, A. A. Radkewich, and S. V. Gunther. "A Study of Thin TiNi Fibers Superelasticity." KnE Materials Science 2, no. 1 (July 17, 2017): 115. http://dx.doi.org/10.18502/kms.v2i1.787.

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Thin TiNi fibers which having superelasticity with diameter from 90 to 30 mm obtained from medical application alloy TN-10 by traction across dies with interval annealings are researched. Fine TiNi alloy fibers diameter of 90 to 30 microns having superelastic properties, obtained from TN-10 alloy for medical purposes by traction through dies with intermediate annealing. Availability superelastic properties allow thin fibers to function long in the body as the implant material. The optimum temperature superelastic properties of thin fibers with a diameter 90-30 mm was determined. It has been shown that with decreasing fibers diameter from 90 to 30 mm maximum temperature manifestations superelastic properties without residual deformation is shifted to higher temperatures, reaching values of 93 -95 °Cfor 30 mm diameter fibers.

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15

Barilyuk, Danil, Andrey Bazlov, Natalia Arkharova, Tatyana Teplyakova, Anton Konopatsky, and Sergey Prokoshkin. "Novel Zr-Rich Alloys of Ternary Ti-Zr-Nb System with Large Superelastic Recovery Strain." Metals 12, no. 2 (January 19, 2022): 185. http://dx.doi.org/10.3390/met12020185.

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Four novel superelastic alloys, Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, Ti-44Zr-10Nb (at.%), were obtained and studied in terms of their microstructure and mechanical properties. The obtained alloys were subjected to thermomechanical treatment, providing alloys with a pronounced superelastic behavior. Materials phase composition and microstructure were studied using XRD and SEM methods. Based on the XRD results, maximum lattice strains in the 011β direction were calculated as 5.9%, 6.3%, 7.5%, and 7.2% for Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, and Ti-44Zr-10Nb alloys, respectively. Mechanical properties of the thermomechanically-treated alloys were studied by Vickers microhardness testing, static tensile testing, and superelastic mechanical cycling. The maximum superelastic recovery strains attained at room temperature was 3.7%, 1.9%, 3.2%, and 3.0% for the Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, and Ti-44Zr-10Nb alloys, respectively. Ti-41Zr-12Nb alloy demonstrated the highest ductility, with relative elongation to failure of over 20%, combined with the total recovery strain of more than 6%. Obtained results indicate that Ti-41Zr-12Nb is one the most promising alloys of the Ti-Zr-Nb system, with quite perfect superelastic behavior at room temperature.

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16

Hu, Jong Wan. "Seismic analysis and evaluation of several recentering braced frame structures." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 5 (August 1, 2013): 781–98. http://dx.doi.org/10.1177/0954406213490600.

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After earthquakes, residual inter-story drifts greater than 0.5% in buildings may indicate a complete loss of the structure from an economic point of view. Recently, research efforts have been extended to the utilization of superelastic shape memory alloy materials for the smart control systems that can automatically reduce the plastic deformation of the structure subjected to strong seismic loading. Superelastic shape memory alloys are unique metallic alloys that undergo substantial inelastic deformations and regain their original conditions when applied loads are removed, thus alleviating the problem of permanent deformation. The frame structures make the best use of such shape memory alloy’s recentering capability if the superelastic shape memory alloy segments used to replace the steel segments are installed at the part where large deformation is likely to occur. The primary focus of this study is on the seismic response of special steel concentrically braced frames and buckling-restrained braced frames, utilizing superelastic shape memory alloy braces. In order to examine the comparative residual inter-story drift response of both braced frames, 3- and 6-story buildings were designed in accordance with current code specifications, and then nonlinear time-history analyses for two seismic hazard levels were conducted on 2D analytical frame models. The braced frames with superelastic shape memory alloy bracing systems were also compared to those with conventional steel bracing systems. Overall, analysis results show that the superelastic shape memory alloy bracing systems are more effective in decreasing residual inter-story drifts than the conventional steel bracing systems.

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17

Yan, Wen Yi, and Qing Ping Sun. "Spherical Indentation of Superelastic Shape Memory Alloys." Key Engineering Materials 334-335 (March 2007): 601–4. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.601.

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Spherical indentation of superelastic shape memory alloys (SMAs) has been theoretically analyzed. Two characteristic points on the superelastic indentation curve have been discovered. The bifurcation force corresponding to the bifurcation point relies on the forward transformation stress and the return force corresponding to the return point relies on the reverse transformation stress. Based on these theoretical relationships, an approach to determine the transformation stresses of superelastic SMAs has been proposed. To improve the accuracy of the measurement, a slope method to locate the two characteristic points from the slope curves is further suggested. Additionally, the spherical indentation hardness was also analyzed.

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18

Kumaran, Deepa, Shantha Sundari, and Shyamala Chandrasekhar. "A Systematic review on aligning efficiency of superelastic NITI: in comparison with conventional NITI and multistranded stainless steel archwires." International Journal of Dental Research 5, no. 1 (April 5, 2017): 39. http://dx.doi.org/10.14419/ijdr.v5i1.7355.

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Background: The initial leveling and aligning phase of orthodontic treatment involve the use of nickel titanium wires. The nickel titanium wires exhibit unique properties like shape memory and superelasticity. In the beginning, conventional nitinol wires were used, which lacked the superelastic property. Nowadays, superelastic nickel titanium wires are being used commonly. This systematic review aims to evaluate the efficiency of Superelastic NITi in the initial alignment of orthodontic treatment in comparison with conventional NiTi and multistranded stainless steel archwires by measuring the amount of decrowding and the time taken for decrowding.Method: A systematic literature search was performed on Pubmed, Cochrane, Google scholar & Lilacs.Result: Thirty four studies were identified by the search and ten studies satisfied the inclusion criteria and one study was excluded after abstract reading. Finally nine articles were included for quality assessment.Conclusion: This systematic review concluded that there was no significant differences in the aligning efficiency of superelastic NiTi in comparison with conventional NiTi and multistranded stainless steel wires.

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19

Cornetto, Anthony D., and Eugene de Juan. "Reusable Superelastic Iris Retractor." Ophthalmic Surgery, Lasers and Imaging Retina 30, no. 7 (July 1999): 586–87. http://dx.doi.org/10.3928/1542-8877-19990701-19.

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20

Waters, N. E. "Superelastic Nickel-titanium Wires." British Journal of Orthodontics 19, no. 4 (November 1992): 319–22. http://dx.doi.org/10.1179/bjo.19.4.319.

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21

Attanasi, Gabriele, and Ferdinando Auricchio. "Innovative Superelastic Isolation Device." Journal of Earthquake Engineering 15, sup1 (March 31, 2011): 72–89. http://dx.doi.org/10.1080/13632469.2011.562406.

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22

Fournier, Eric, Robert Devaney, Matthew Palmer, Joshua Kramer, Ragheb El Khaja, and Matthew Fonte. "Superelastic Orthopedic Implant Coatings." Journal of Materials Engineering and Performance 23, no. 7 (April 29, 2014): 2464–70. http://dx.doi.org/10.1007/s11665-014-1008-6.

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23

Ikeda, Tomiki, and Toru Ube. "A superelastic organic crystal." Nature 511, no. 7509 (July 2014): 300–301. http://dx.doi.org/10.1038/511300a.

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24

Boubakar, M. L., B. Vieille, and P. Boisse. "Superelastic shell structures modelling." Computer Methods in Applied Mechanics and Engineering 194, no. 50-52 (December 2005): 5273–94. http://dx.doi.org/10.1016/j.cma.2005.02.022.

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25

Hong, Chenkai, Hui Qian, and Gangbing Song. "Uniaxial Compressive Behavior of Concrete Columns Confined with Superelastic Shape Memory Alloy Wires." Materials 13, no. 5 (March 9, 2020): 1227. http://dx.doi.org/10.3390/ma13051227.

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Superelastic shape memory alloy (SMA) exhibits the ability to undergo large deformations before reverting back to its undeformed shape following the removal of the load. This unique property underlies its great potential in the seismic design and retrofitting of structure members. In this paper, superelastic SMA wires were utilized to confine concrete cylinders to enhance their axial compressive behavior. The axial carrying and deformation capacities of SMA-confined concrete cylinders are assessed by uniaxial compression testing on a total of eight SMA-confined concrete columns and one unconfined column. The influence of the amount of SMA and the prestrain level of SMA wires, as well as the reinforcing mode, on the axial carrying and deformation capacity of confined concrete columns were considered. The analysis focuses on the axial carrying capacity and deformation performance of concrete columns reinforced with superelastic SMA under different loading conditions. Based on the experimental data and analysis results, it is found that superelastic SMA wires can increase the axial loading capacity and enhance deformation performance of concrete columns. Under the same loading condition, the ultimate bearing capacity of SMA-confined concrete columns increases as the increasing of the amount of SMA wire. The results of this study verify the effectiveness of superelastic SMA in enhancing the loading capacity and deformation behavior of concrete cylinders.

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26

Hall, B. V., R. T. Sang, M. Shurgalin, W. R. MacGillivray, M. C. Standage, and P. M. Farrell. "Electron superelastic scattering from states of atomic sodium and rubidium." Canadian Journal of Physics 74, no. 11-12 (November 1, 1996): 977–83. http://dx.doi.org/10.1139/p96-817.

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This paper reports on the extension of the electron superelastic scattering technique to three new situations. The first considers scattering from the 32P3/2 level of Na that has been excited by two laser modes tuned, respectively, to the transitions from the two hyperfine states of the 32S1/2 ground level. Both coherent and noncoherent modes are treated in a full quantum electrodynamic model of the laser excitation. Under certain conditions, the time-averaged probability of finding an atom in the 32P3/2 level exceeds 0.5. The second situation is electron superelastic scattering from the 32D5/2 level of Na that has been resonantly excited from the ground level via a resonant intermediate level. With the first observation of superelastically scattered electrons from this higher lying level recently recorded, this paper considers the extension of the quantum electrodynamics (QED) model to describe the optical excitation process. Application of superelastic scattering to the 52S1/2–52P3/2 transition of Rb is the third situation considered. The superelastic scattering formalism is extended to allow for a nonzero spin flip cross section for this transition. The resulting optical pumping terms are calculated using the QED model and the method of their determination for the superelastic scattering experiment described. The experimental design necessary to measure all of the collision parameters for this transition is discussed.

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27

López Cuellar, E., Gérard Guénin, and Michel Morin. "Strain-Resistivity Behavior of a Ti-45Ni-5Cu Shape Memory Alloy during Superelastic and SATWME Cycling." Materials Science Forum 509 (March 2006): 81–86. http://dx.doi.org/10.4028/www.scientific.net/msf.509.81.

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The strain-resistivity behavior of Ti-45.0Ni-%.0Cu wires has been measured during superelastic cycling. The results are in good agreement with previous results, showing that the main changes of resistivity during superelastic cycling are due to Austenite ↔ Martensite phase changes and anisotropic variant orientation. The true plastic strain (dislocations) does not seem to play an important role for this alloy.

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28

Quandt, Eckhard, and C. Zamponi. "Superelastic NiTi Thin Films for Medical Applications." Advances in Science and Technology 59 (September 2008): 190–97. http://dx.doi.org/10.4028/www.scientific.net/ast.59.190.

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Shape memory alloys are able to provide high work output when due to the martensitic transformation. Therefore, they are a promising candidate for actuation mechanisms in microsystems, e.g. in microvalves. Sputter deposited SMA thin films are already in use as free-standing films or as composites. Since it is also possible to deposit and structure the SMA composites on Si substrates by photolithographic techniques, the fabrication process is compatible to MEMS and therefore most favorable for an number of applications. Superelastic shape memory materials are of special interest in medical applications due to the large strains at constant stress and their biocompatibility. Superelastic NiTi thin films have been fabricated by magnetron sputtering using cast melted targets. Special heat treatment was performed to adjust superelastic properties and transformation temperatures. A superelastic strain of up to 6.5% at 37°C was obtained. Although NiTi shows an excellent biocompatibility enhanced antibacterial properties would significantly broaden its application range. Coatings containing Ag have already been used for this application. In order to apply this approach to TiNi-based alloys thin films of different TiNiAg compositions have been prepared by sputtering.

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29

Teubner, P. J. O., V. Karaganov, and K. A. Stockman. "Coherence and Correlation in Electron Scattering from the Alkalis." Australian Journal of Physics 52, no. 3 (1999): 421. http://dx.doi.org/10.1071/ph98081.

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A series of superelastic electron scattering experiments from lithium and from potassium is described in which the total polarisation parameter P+ is measured. We report significant departures from the coherence condition P+ = 1 for both targets. The structure observed in the parameter P+ can be interpreted by a qualitative wave mechanical model that had been introduced by our research group to explain similar structure in superelastic electron scattering experiments from sodium.

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30

Chluba, C., W. Ge, T. Dankwort, C. Bechtold, R. Lima de Miranda, L. Kienle, M. Wuttig, and E. Quandt. "Effect of crystallographic compatibility and grain size on the functional fatigue of sputtered TiNiCuCo thin films." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2074 (August 13, 2016): 20150311. http://dx.doi.org/10.1098/rsta.2015.0311.

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The positive influence of crystallographic compatibility on the thermal transformation stability has been already investigated extensively in the literature. However, its influence on the stability of the shape memory effect or superelasticity used in actual applications is still unresolved. In this investigation sputtered films of a highly compatible TiNiCuCo composition with a transformation matrix middle eigenvalue of 1±0.01 are exposed to thermal as well as to superelastic cycling. In agreement with previous results the thermal transformation of this alloy is with a temperature shift of less than 0.1 K for 40 cycles very stable; on the other hand, superelastic degradation behaviour was found to depend strongly on heat treatment parameters. To reveal the transformation dissimilarities between the differently heat-treated samples, the microstructure has been analysed by transmission electron microscopy, in situ stress polarization microscopy and synchrotron analysis. It is found that good crystallographic stability is not a sufficient criterion to avoid defect generation which guarantees high superelastic stability. For the investigated alloy, a small grain size was identified as the determining factor which increases the yield strength of the composition and decreases the functional degradation during superelastic cycling. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

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31

Silwal, Baikuntha, Qindan Huang, Osman E. Ozbulut, and Mojtaba Dyanati. "Comparative seismic fragility estimates of steel moment frame buildings with or without superelastic viscous dampers." Journal of Intelligent Material Systems and Structures 29, no. 18 (September 10, 2018): 3598–613. http://dx.doi.org/10.1177/1045389x18798936.

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Superelastic viscous damper is a passive hybrid control device that combines shape memory alloy cables and a viscoelastic damper to mitigate dynamic response of structures subjected to multi-level seismic hazards. In the hybrid device, shape memory alloy cables that exhibit a nonlinear but elastic response are used mainly as re-centering unit, while the viscoelastic damper composed of high-damped butyl rubber compounds is employed to augment the equivalent viscous damping provided by the device. This study evaluates the effectiveness of superelastic viscous dampers in mitigating seismic response of steel frame structures through a probabilistic framework. First, a nine-story steel frame building is designed and modeled with and without superelastic viscous dampers, and extensive nonlinear response-history analyses are conducted. Then, probabilistic demand models are developed for selected engineering demand parameters. To quantitatively compare the performance of the designed buildings, seismic fragility curves and mean annual frequency of exceeding different performance levels are developed. In particular, the structural performance is evaluated using both peak inter-story drift and residual drift responses. Results indicate that superelastic viscous dampers can significantly improve structural performance; thus, it has the potential to lower the post-earthquake losses, as the better structural performance leads to less loss in relocation, rental, and economic loss.

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32

Roytburd, A. L. "Intrinsic Hysteresis of Superelastic Deformation." Materials Science Forum 327-328 (January 2000): 389–92. http://dx.doi.org/10.4028/www.scientific.net/msf.327-328.389.

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33

Ryan, Adam. "Superelastic Nickel Titanium Coil Springs." British Journal of Orthodontics 22, no. 4 (November 1995): 370–76. http://dx.doi.org/10.1179/bjo.22.4.370.

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La Roca, Paulo, and Marcos Sade. "Designing a wider superelastic window." Science 369, no. 6505 (August 13, 2020): 773–74. http://dx.doi.org/10.1126/science.abc8244.

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Karaganov, V., Igor Bray, P. J. O. Teubner, and P. Farrell. "Superelastic electron scattering on lithium." Physical Review A 54, no. 1 (July 1, 1996): R9—R12. http://dx.doi.org/10.1103/physreva.54.r9.

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Sartori, Cláudio S., Fernando J. da Paixão, and Marco A. P. Lima. "Superelastic cross sections ine−-H2scattering." Physical Review A 55, no. 4 (April 1, 1997): 3243–46. http://dx.doi.org/10.1103/physreva.55.3243.

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Stockman, K. A., V. Karaganov, I. Bray, and P. J. O. Teubner. "Superelastic electron scattering from potassium." Journal of Physics B: Atomic, Molecular and Optical Physics 31, no. 20 (October 28, 1998): L867—L872. http://dx.doi.org/10.1088/0953-4075/31/20/004.

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Théry, Manuel, and Atef Asnacios. "Cellular stretch reveals superelastic powers." Nature 563, no. 7730 (October 31, 2018): 192–94. http://dx.doi.org/10.1038/d41586-018-07172-9.

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Lima de Miranda, Rodrigo, Christiane Zamponi, and Eckhard Quandt. "Micropatterned Freestanding Superelastic TiNi Films." Advanced Engineering Materials 15, no. 1-2 (October 12, 2012): 66–69. http://dx.doi.org/10.1002/adem.201200197.

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Yu, Zhi‐Long, Bing Qin, Zhi‐Yuan Ma, Jin Huang, Si‐Cheng Li, Hao‐Yu Zhao, Han Li, Yin‐Bo Zhu, Heng‐An Wu, and Shu‐Hong Yu. "Superelastic Hard Carbon Nanofiber Aerogels." Advanced Materials 31, no. 23 (April 15, 2019): 1900651. http://dx.doi.org/10.1002/adma.201900651.

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Pérez-Junyent, Clàudia, Marcel Porta, Emma Valdés, Lluís Mañosa, Antoni Planes, Avadh Saxena, and Eduard Vives. "Flexocaloric effect in superelastic materials." APL Materials 10, no. 12 (December 1, 2022): 121103. http://dx.doi.org/10.1063/5.0129331.

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We present a combined theoretical–experimental study of flexocaloric effects in superelastic materials exhibiting structural transitions. We study a Ginzburg–Landau model combined with a vibrational model for a beam near a ferroelastic transition loaded with a three-point bending setup. We also perform experiments on a Cu–Al–Ni single crystal undergoing a martensitic transition. We measure bent beam profiles, vertical force vs vertical deflection during a slow isothermal process, time evolution of the bending and unbending amplitudes, and the evolution of temperature profiles. We also compute the evolution of heat source and heat sink profiles. Finally, we study the location of acoustic emission events during the bending/unbending experiment. Our observations are consistent with the model predictions and allow us to identify the main physical parameters relevant for flexocaloric applications.

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Du, Zhijiang, Miao Yang, and Wei Dong. "Multi-objective optimization of a type of ellipse-parabola shaped superelastic flexure hinge." Mechanical Sciences 7, no. 1 (May 12, 2016): 127–34. http://dx.doi.org/10.5194/ms-7-127-2016.

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Abstract. Flexure hinges made of superelastic materials is a promising candidate to enhance the movability of compliant mechanisms. In this paper, we focus on the multi-objective optimization of a type of ellipse-parabola shaped superelastic flexure hinge. The objective is to determine a set of optimal geometric parameters that maximizes the motion range and the relative compliance of the flexure hinge and minimizes the relative rotation error during the deformation as well. Firstly, the paper presents a new type of ellipse-parabola shaped flexure hinge which is constructed by an ellipse arc and a parabola curve. Then, the static responses of superelastic flexure hinges are solved via non-prismatic beam elements derived by the co-rotational approach. Finite element analysis (FEA) and experiment tests are performed to verify the modeling method. Finally, a multi-objective optimization is performed and the Pareto frontier is found via the NSGA-II algorithm.

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Janouchova, Katerina, Ludek Heller, and Monika Vysanska. "Functional warp-knitted fabrics with integrated superelastic niti filaments." Autex Research Journal 12, no. 2 (October 1, 2012): 34–39. http://dx.doi.org/10.2478/v10304-012-0007-7.

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Abstract We report on a particular direction of currently conducted extended research on novel textiles with integrated thin metallic filaments made of an intermetallic shape memory NiTi alloy exhibiting functional behaviour such as superelastic deformation up to 10% and a thermally induced shape memory effect. Within this research direction we focus on development of single and multi-layered warp-knitted fabrics that are directionally reinforced with superelastic NiTi filaments. First, we describe the expected properties of such novel structures and their potential applications. Second, we present the functional thermomechanical behaviour of applied superelastic NiTi filaments. Third, we address questions related to the design and fabrication of warp-knitted fabrics with integrated NiTi filaments. Then, we describe experimental methods applied on novel functional textiles in order to evaluate their functional properties. Finally, we present and discuss results of experiments carried out on these novel functional textiles.

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Cameron, Nicole, and Zoheir Farhat. "Single Particle Erosion Behavior of NiTi-Based Nanolaminates and Superelastic NiTi Monolayer Coatings." Coatings 9, no. 10 (September 27, 2019): 617. http://dx.doi.org/10.3390/coatings9100617.

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Bulk NiTi is used to make parts, such as couplings and bearings, that can be found in many industries such as the automotive, aerospace and medical sectors. Forming and machining bulk superelastic NiTi is a very difficult and costly process; however, applying NiTi as a surface coating will provide an alternate manufacturing method that will minimize machining processes. The objective of this study is to produce a superelastic NiTi-based surface coating that exhibits denting, impact and wear resistance. Superelastic NiTi has been successfully produced through vacuum deposition processes, despite this, there is a lack of a full and comprehensive study on the formation of the NiTi phase during coating development. In this study, the NiTi phase is fabricated through the annealing of sputtered deposited Ti and Ni layers in a coating. To confirm the presence of the intermetallic phases, X-ray diffraction (XRD) and energy dispersive spectrometry (EDS) analysis were performed. The erosion behavior of the coating is evaluated through single particle erosion testing, which resulted in the coatings that contained the NiTi precipitates to exhibit the best damage resistance compared to the other nanolaminates. This indicates that the superelastic NiTi phase increases the resistance to impacting particles. Microstructural evolution and NiTi formation during annealing is discussed and related to the observed damage resistance of the coatings.

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Legrand, Vincent, Sylvain Moyne, Laurent Pino, Shabnam Arbab Chirani, Sylvain Calloch, Reza Arbab Chirani, and Valerie Chevalier. "Mechanical Behavior Study of NiTi Endodontic Files Taking into Account Anatomic Shape of Root Canals." Materials Science Forum 738-739 (January 2013): 549–53. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.549.

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Superelastic NiTi SMA is the base of endodontic files. The flexibility of these instruments permits the preparation of root canals. Unfortunately the intracanal file separation can occur. To have a good idea of the mechanical behavior of these instruments, we propose in this study the finite elements simulations taking into account the real shape of root canals. This has been possible by using a well adapted model describing all the particularities of superelastic SMA and by using representative limit conditions.

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Guo, Lanyu, Zongbin Li, Jiaxing Chen, Bo Yang, Haile Yan, Xiang Zhao, Claude Esling, and Liang Zuo. "Enhanced Magnetostrain in a <0 0 1>A-Textured Ni44.5Co4.9Mn37.5In13.1 Alloy through Superelastic Training." Materials 15, no. 6 (March 11, 2022): 2072. http://dx.doi.org/10.3390/ma15062072.

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Large magnetostrain can be demonstrated in Ni-Mn-X (X = In, Sn, Sb) meta-magnetic shape memory alloys by resuming the predeformed martensite through magnetic-field-induced reverse martensitic transformation. However, owing to the constraint from the self-accommodated microstructure and randomly distributed crystallographic orientation, spontaneous magnetostrain without predeformation in polycrystalline alloys remains low. Here, by combining microstructure texturing and superelastic training, enhanced spontaneous magnetostrain was achieved in a directionally solidified Ni44.5Co4.9Mn37.5In13.1 alloy with strong <0 0 1>A preferred orientation. After superelastic training through cyclic compressive loading/unloading on the directionally solidified alloy, a large spontaneous magnetostrain of ~0.65% was obtained by applying a magnetic field of 5 T, showing great improvement when compared to that of the untrained situation, i.e., ~0.45%. Such enhanced magnetoresponse is attributed to the internal stress generated through superelastic training, which affects the variant distribution and the resultant output strain in association with the martensitic transformation.

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Matsui, R., H. Tobushi, Y. Furuichi, and H. Horikawa. "Tensile Deformation and Rotating-Bending Fatigue Properties of a Highelastic Thin Wire, a Superelastic Thin Wire, and a Superelastic Thin Tube of NiTi Alloys." Journal of Engineering Materials and Technology 126, no. 4 (October 1, 2004): 384–91. http://dx.doi.org/10.1115/1.1789952.

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The tensile deformation and rotating-bending fatigue properties of a highelastic thin wire, a superelastic thin wire and a superelastic thin tube, all made of NiTi alloys, were investigated experimentally. The results obtained are summarized as follows: (1) The stress-strain curve of the highelastic thin wire is approximately linear up to a strain of 4 percent with a stress of 1400 MPa and shows little dependency on temperature and strain rate; (2) The modulus of elasticity for the initial loading stage of both the highelastic wire and the superelastic tube is low, showing superior bending flexibility as is necessary for medical applications; (3) The slopes of the strain-life curves of the alloys are steep in the low-cycle fatigue region (the strain amplitude of the fatigue limit is in the region of 0.6–0.8 percent); and (4) In the tube, fatigue cracking initiates on the rougher inner surface, resulting in a shorter fatigue life than in the case of the wire.

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Nucera, Riccardo, Elda Gatto, Chiara Borsellino, Pasquale Aceto, Francesca Fabiano, Giovanni Matarese, Letizia Perillo, and Giancarlo Cordasco. "Influence of bracket-slot design on the forces released by superelastic nickel-titanium alignment wires in different deflection configurations." Angle Orthodontist 84, no. 3 (September 25, 2013): 541–47. http://dx.doi.org/10.2319/060213-416.1.

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ABSTRACT Objective: To evaluate how different bracket-slot design characteristics affect the forces released by superelastic nickel-titanium (NiTi) alignment wires at different amounts of wire deflection. Materials and Methods: A three-bracket bending and a classic-three point bending testing apparatus were used to investigate the load-deflection properties of one superelastic 0.014-inch NiTi alignment wire in different experimental conditions. The selected NiTi archwire was tested in association with three bracket systems: (1) conventional twin brackets with a 0.018-inch slot, (2) a self-ligating bracket with a 0.018-inch slot, and (3) a self-ligating bracket with a 0.022-inch slot. Wire specimens were deflected at 2 mm and 4 mm. Results: Use of a 0.018-inch slot bracket system, in comparison with use of a 0.022-inch system, increases the force exerted by the superelastic NiTi wires at a 2-mm deflection. Use of a self-ligating bracket system increases the force released by NiTi wires in comparison with the conventional ligated bracket system. NiTi wires deflected to a different maximum deflection (2 mm and 4 mm) release different forces at the same unloading data point (1.5 mm). Conclusion: Bracket design, type of experimental test, and amount of wire deflection significantly affected the amount of forces released by superelastic NiTi wires (P < .05). This phenomenon offers clinicians the possibility to manipulate the wire's load during alignment.

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Figueiredo, Ana Maria Gontijo, Berenice Mendonça Gonzalez, Vicente Tadeu Lopes Buono, and Paulo José Modenesi. "Fatigue Life Curves of NiTi Alloys – The Z Effect." Materials Science Forum 643 (March 2010): 69–77. http://dx.doi.org/10.4028/www.scientific.net/msf.643.69.

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Superelasticity is closely related to shape memory effect. It refers to the property presented by some materials submitted to large strains (usually up to about 8%) to restore their original shape immediately after unloading without the need of heating. This phenomenon results directly from a diffusionless transformation of the material from an austenitic to a martensitic phase (martensitic transformation). The recovering mechanism is the reverse transformation, from martensite to austenite. This paper compares fatigue live curves obtained in bending-rotation fatigue tests carried out on wires of NiTi alloys with three different microstructures, stable austenite, unstable austenite (superelastic), and stable martensite. These curves are also compared to data from the literature. The tests were strain controlled and the wires were submitted to strain amplitudes from 0.6% to 12.0%. To minimize changes in material properties, the wire temperature was monitored using a thermocouple and controlled by its rotation speed. For strain amplitudes up to 4%, the εa-Nf curve for superelastic wires was consistent with those reported in the literature, closely approaching the curve of the stable austenite wire. For higher strain amplitudes, fatigue life of superelastic wires increased with strain until it approached the fatigue life curve of stable martensitic wire. This unusual behavior results in a “Z-shaped” curve for high strain values. It is possibly linked to the changes in microstructure and fatigue properties that occur when the superelastic material is deformed.

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Buasri, Taywin, Hyunbo Shim, Masaki Tahara, Tomonari Inamura, Kenji Goto, Hiroyasu Kanetaka, Yoko Yamabe-Mitarai, and Hideki Hosoda. "Mechanical and Superelastic Properties of Au-51Ti-18Co Biomedical Shape Memory Alloy Heat-Treated at 1173 K to 1373 K." Advances in Science and Technology 97 (October 2016): 141–46. http://dx.doi.org/10.4028/www.scientific.net/ast.97.141.

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The effect of heat treatment temperature from 1173 K to 1373 K for 3.6 ks on mechanical and superelastic properties of an Ni-free Au-51Ti-18Co alloy (mol%) was investigated. The stress for inducing martensitic transformation (SIMT) and the critical stress for slip deformation (CSS) slightly decrease with increasing the heat–treatment temperature. Regardless of heat–treatment temperature, good superelasticity was definitely recognized with the maximum shape recovery ratio up to 95 % and 4 % superelastic shape recovery strain. As the mentioned reasons, the Au-51Ti-18Co alloy is promising for practical biomedical applications.

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