Relevant bibliographies by topics / Superelastic

Academic literature on the topic 'Superelastic'

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Published: 4 June 2021
Last updated: 26 January 2023

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Journal articles on the topic "Superelastic"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Superelastic"

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Slaughter, Daniel Stephen, and d. slaughter@aip org au. "Superelastic Electron Scattering from Caesium." Flinders University. Chemistry Physics and Earth Sciences, 2007. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20071009.100421.

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This thesis describes an experimental study of superelastic electron scattering from the 6^2P_3/2 state of caesium. The present status of electron-atom collision studies is initially reviewed and the motivation behind the current work is then presented. A description of the theoretical framework is subsequently provided in the context of the present experimental study, followed by an overview of the several theoretical approaches for describing electron-atom interactions which are currently available. The apparatus and experimental setup used throughout the project are also described in detail. Technical specifications and data are provided, including diagrams (where appropriate) for a laser frequency locking system, electron gun and spectrometer, atomic beam source and data acquisition system. The experimental procedures are explained and discussed, including a detailed analysis of the optical pumping process required to excite the atomic target. A substantial component of this project was to address several potential sources of systematic error and to reduce these wherever possible. All of the errors and uncertainties relevant to the experiment are discussed in chapter 5. In chapter 6 the results of the present superelastic electron scattering experiments are reported for incident electron energies of 5.5eV, 8.5eV and 13.5eV, corresponding to superelastic electron energies of 7eV, 10eV and 15eV. These results are presented as three reduced Stokes parameters, P1, P2, P3 and a coherence parameter, P+ . For comparison, predictions from a number of currently available theories are presented alongside the experimental results. Finally, conclusions are drawn on this work in the context of the current status of electron-atom scattering from alkali-metals.
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Alarcon, Tarquino Eduardo Augusto. "Structural fatigue of superelastic NiTi wires." Thesis, Brest, 2018. http://www.theses.fr/2018BRES0019/document.

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Ce travail de thèse aborde les conditions et les mécanismes qui conduisent des fils superélastiques de NiTi à la rupture sous chargement mécanique cyclique. Les alliages à mémoire de forme du type NiTi présentent des propriétés thermomécaniques fonctionnelles comme la superélasticité et l’effet de mémoire de forme simple et double, lesquels sont générées grâce aux transformations de phase martensitiques provoquées soit par un changement de la contrainte ou de la température. Ces transformations de phase sont en principe des processus totalement réversibles et sans endommagement. Cependant, lorsque le NiTi est soumis à des transformations de phase induites par des contraintes cycliques, la performance en fatigue de l’alliage chute considérablement par rapport au NiTi non-transformant. La plupart des courbes S-N de fatigue rapportant cette chute ont été mesurées sur des fils NiTi a section constante dans lesquels les transformations martensitiques se développent de façon hétérogene par nucléation et propagation de bandes de cisaillement. De plus, d'après notre expérience, des essais de fatigue sur des échantillons de fils à section constante entrainent la rupture à l'intérieur des mors de la machine d'essai. Par conséquent, les valeurs de contrainte-déformation rapportées dans les courbes S-N ne sont pas nécessairement représentatives des conditions mécaniques critiques qui conduisent le matériau à la rupture. Dans le but de mieux caractériser les performances en fatigue des fils NiTi, nous avons effectué une série de tests de fatigue en traction-traction, tout en utilisant des échantillons sous forme ≪ diabolo ≫. La géométrie de ces échantillons nous a permis de confiner tous les processus de transformation martensitique et de fatigue dans un volume utile bien défini. La caractérisation du comportement thermomécanique de ces échantillons a été réalisée en combinant plusieurs techniques expérimentales et d'analyse telles que la corrélation d'image numérique(DIC), la thermographie infrarouge, la diffraction des rayons X à source synchrotron, la microscopie optique, la microscopie électronique à balayage et l'analyse par éléments finis. Une attention particulière à été portée à la performance de NiTi dans le régime à grand nombre de cycles (HCF) dans laquelle le matériau présente un comportement élastique ou une transformation de phase intermédiaire (appelée R-phase). Les résultats des tests de fatigue nous ont permis de distinguer les étapes de nucléation et de propagation des fissures pendant la durée de vie totale de nos échantillons. Afin de mieux comprendre les mécanismes qui conduisent à la nucléation des fissures, nous avons appliqué la méthode de l’auto-échauffement, qui a démontré son efficacité dans la prédiction de fatigue dans les cas des alliages d'aluminium et des alliages d'acier. Cette méthode corrèle l'élévation de température d'un échantillon soumis à différentes amplitudes de charge cyclique avec des mécanismes de dissipation d'énergie. Ces mécanismes dissipatifs sont après associés à l’accumulation d’endommagement locale dans le matériau. La méthode d'autoéchauffement a été réalisée en utilisant des mesures de champs thermiques des d'échantillons de NiTi sous forme diabolo pendant de chargement cyclique
This Ph.D. dissertation thesis addresses the conditions and mechanisms that lead superelastic NiTi wires to fail under cyclic mechanical loads. NiTi shape memory alloys exhibit functional thermomechanical properties (superelasticity, shape memory effect, thermal actuation) due to martensitic phase transformations caused by a change of the applied stress and temperature. These phase transformations are though as fully reversible damage-free processes, however, when NiTi is subjected to repetitive stress-induced phase transformations its fatigue performance drops drastically in comparison to non-transforming NiTi. Most of fatigue S-N curves reporting this drop were measured on straight NiTi wires in which martensitic transformations proceed heterogeneously through nucleation and propagation of shear bands. Moreover, from our experience fatigue testing straight wire samples results in undesired failure inside the testing machine clamps. Hence, the reported stress-strain values in S-N curves are not necessarily representative of the critical mechanical conditions that lead the material to failure. With the aim of better characterize the fatigue performance of NiTi wires, we started by carrying out a series of pull-pull fatigue tests using hourglass-shaped samples. This sample geometry allowed us to confine all martensitic transformation and related material fatigue processes into a well-defined gauge volume. The samples’ characterization was performed by combining several experimental and analysis techniques such as Digital Image Correlation, Infrared Thermography, Synchrotron-source X-ray diffraction, Optical Microscopy, Scanning Electron Microscopy and Finite Element Analysis. A special attention was paid to the High Cycle Fatigue (HCF) performance of NiTi in which the material shows elastic behavior and/or an intermediate phase transformation (so-called R-phase). The results from HCF tests allowed us to distinguish crack nucleation and crack propagation stages during the total life of our NiTi samples. In order to get a better understanding of the mechanisms that lead to crack nucleation, we applied the nonconventional Self-Heating fatigue assessment method, which has shown efficiency in the case of aluminum and steel alloys. This method correlates the temperature elevation of a sample subjected to different cyclic load amplitudes with energy dissipating mechanisms that contribute to accumulating local damage in the material. The Self-Heating method was performed using full-field thermal measurements of cyclically loaded NiTi hourglass-shaped samples
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Joris, Oliver Pieter Johnathan. "Diffraction experiments on superelastic beta titanium alloys." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/43967.

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This thesis investigates superelasticity in metastable beta titanium alloys that contain substantial additions of Mo, principally. Superelasticity arises from a reversible transformation from the β to the orthorhombic alpha double prime (α") phase during loading, which was studied principally using in situ synchrotron X-ray diffraction at the I12 beamline at the Diamond synchrotron. Superelastic β-Ti alloys have the potential to be low weight, economical alternatives to NiTi, Gum metal and Ti-2448 for biomedical, military and aerospace applications. The cubic to orthorhombic stress induced martensitic phase transformation is reversible but has an associated permanent deformation. Reducing the permanent deformation associated with cyclic strain is key to the commercial use of these alloys. The effect of β stability on the SE recovery of Ti-Mo, Ti-Mo-Al and Ti-Mo-O alloys has been investigated. Superelastic behaviour was recreated using cyclic strain whilst being examined under in-situ synchrotron X-ray diffraction. Study of the superelastic phase transformation was carried out in-situ due to the reversible nature of the transformation causing the superelastic phase to largely disappear upon unloading. The superelastic behaviour is shown to be sensitive to β stability and in turn composition and temperature. The addition of aluminium and oxygen can be used to enhance both superelastic recovery and strength. The alloys were designed using Morinaga's orbital design approach combined with Laheurte's average valence electron values, tailoring the bond order (Bo) and electronegativity (Md) in order to alter the method of deformation and phase stability. The third alloy design factors considered concern the effect of alloying on the C' modulus of the β, the ω stability and martensite transformation temperatures. Together these methods, whilst semi-empirical, provide a rational basis for alloy design. Both the lowered stiffness and lower apparent stiffness associated with the design method and the transformation respectively could lead to lowering the stiffness of beta Ti alloys towards that of cortical bone. This would reduce the stiffness mismatch that promotes bone re-absorption around surgical implants, reducing the need for implant replacements. Also, the recent developments in eradicating the residual strain associated with the transformation has led to interest from the aerospace industry for possible (high temperature) damping applications. The Ti-Mo binary mechanical curves show a correlation between the apparent yield stress and composition. An increase in Mo concentration from 7.2 at.% was shown to decrease the yield stress to a minimum at 8.2 at.% Mo, after which the yield stress increased. Out of the 5 binary samples, Ti-8.7Mo at.% showed the best superelastic recovery with a recovery of 1.58% strain for a total strain of 2.3%. The yield stress minima is indicative of the composition at which Ms is closest to room temperature. Ti-8.2Mo at.% has the lowest apparent yield stress and Ti-8.7Mo at.% has the largest SE recovery; this correlates well with the theory that the best superelastic behaviour should be observed for an alloy whose composition places it just above As at room temperature. Al additions, which promote the α phase, were found to significantly improve the superelastic behaviour. Al also acts to suppress the ω phase. The ternary alloy Ti-8.1Mo-5Al at.% showed a 95% strain recovery from a total strain of 1.6% at room temperature. Oxygen behaved as a solution strengthener increasing the yield stress and the associated elastic recovery without impeding the austenitic strain recovery transformation. The addition therefore improved both the apparent yield stress and the SE recovery.
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Knight-Percival, Alexander Stephen. "Low energy super-elastic scattering from laser excited calcium." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/low-energy-superelastic-scattering-from-laser-excited-calcium(e37927e1-97d6-41eb-9a88-06109757c1a0).html.

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Super-elastic scattering measurements were taken from calcium using the spectrometer described in this thesis. Calcium atoms were excited from the 41S0 ground state to the 41P1 excited state using a high resolution continuous wave laser set to a wavelength of 423 nm. A beam of electrons with a well defined energy was directed at the laser excited calcium atoms. The excited state was then described by a set of atomic collision parameters P_lin, gamma and L_perp, found from measuring scattered electrons as a function of scattering angle and energy. The scattering chamber was held at a pressure of 3x10 -7 mbar. A resistively heated oven operating at 800 degrees celsius produced a well collimated calcium atomic beam containing the calcium atoms. The electron gun generated a beam of electrons of well defined momentum, whose energy could be changed from ~5 eV to over 100 eV. At energies less than 20 eV the rate of super-elastic electrons was very low, and so modifications were made to the spectrometer to automate data collection for long operating times without the need for user intervention. A new digitally controlled DC voltage supply was constructed to deliver the correct potentials to the electron-optical elements in the spectrometer. An internal microcontroller enabled supply voltages to be programmed either using the front panel or via an attached computer for automatic optimisation of spectrometer voltages using a simplex algorithm. New data was collected for the collision parameters over the full accessible angular range from 25--140 degrees, at energies of 8, 10 and 65 eV. The data at 8 and 10 eV was taken so as to resolve differences between theoretical models at low energies. Comparisons were made with a relativistic distorted wave calculation, an R-matrix calculation, an R-matrix calculation using B-splines and a convergent close coupling theory. A 2 eV discrepancy was identified in the measured electron energy which was thought to be due to stray fields in the chamber. With this considered, convergent close coupling predictions were found to be in excellent agreement with the experimental data.
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Sang, Robert Thomas, and n/a. "Superelastic Electron Scattering from Laser Excited States of Sodium." Griffith University. School of Science, 1995. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050921.120911.

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This thesis presents the results of a series of experiments in which electrons are superelastically scattered from various laser excited states of sodium. The atoms, once in the optically prepared state, are forced to relax via the superelastic collision with an electron. The rate of detection of superelastically scattered electrons was measured as a function of the laser polarisation which enabled pseudo Stokes parameters to be determined. These pseudo Stokes parameters are functions of both optical pumping parameters and atomic collision parameters. The optical pumping parameters describe the laser-atom interaction and the atomic collision parameters describe the electron-atom collision process. Three different laser excitation mechanisms were used to optically pump the atoms into various excited states. The first of these used a single laser tuned to the 32S 112(F'=2 hyperfine state)-~32P312 transition. The excited atoms underwent a superelastic collision with an electron leaving the atom in the ground state and pseudo Stokes parameters were measured as a function of both scattering angle and incident electron energy. The second superelastic experiment, utilised a folded step excitation mechanism which employed two lasers tuned from the two hypethne states of the 32S112 ground state respectively to the 32P312 excited state. Power broadening effects in the single laser experiment cause the atoms to be optically pumped into the F= 1 hyperfine ground state. The laser powers used were not great enough to power broaden the hyperfine ground states and as such the F'= 1 sublevel effectively acted as a sink. The folded step excitation method enabled the excited state population to be increased so that data at larger scattering angles could be obtained. Stokes parameters from both of these experiments which had an incident energy range of 10eV to 30eV and an angular range of 5°-25° were compared to three current electron-atom scattering theories and previous experimental data. Overall, fair to good agreement was found between theory and experiments for the individual Stokes parameters. Losses of coherence was observed at small scattering angles (50.200) at 20eV and 25eV incident electron energies which were poorly modelled by the three different theories. The third superelastic experiment involved the use of two lasers of specified polarisation to stepwise excite the atoms to the 32D512 excited state. Superelastic collisions with incident electron energies of 20eV from the 32D512-*32P312~312 collision were studied at three different scattering angles and pseudo Stokes parameters for the case where the polarisations of the radiation from the lasers were parallel were measured. The single step and folded step laser-atom interactions for it excitation were modelled using a full quantum electrodynamical treatment so that the optical pumping parameters from the single and folded step experiments could be investigated. Equations of motion were derived in the Heisenberg picture and it is shown that for the single laser case 59 equations of motion are required to fully model the interaction and for the folded step ease 78 equations of motion are required. The results of calculations demonstrated that the optical pumping parameters were sensitive to laser intensity, laser detuning and the Doppler width of the atomic beam. The theoretical quantum electrodynamical calculation results were in good agreement with the experimental results.
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揚偉國 and Wai-kwok Kelvin Yeung. "Gradual scoliosis correction by use of a superelastic alloy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31225469.

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Roberto-Pereira, Francisco Fernando. "Extraction of superelastic parameter values from instrumented indentation data." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/290218.

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Interest in superelastic (and shape memory) materials continues to rise, and there is a strong incentive to develop techniques for monitoring of their superelastic characteristics. This is conventionally done via uniaxial testing, but there are many advantages to having a capability for obtaining these characteristics (in the form of parameter values in a constitutive law) via indentation testing. Specimens can then be small, require minimal preparation and be obtainable from components in service. Interrogation of small volumes also allows mapping of properties over a surface. On the other hand, the tested volume must be large enough for its response to be representative of behaviour. Precisely the same arguments apply to more "mainstream" mechanical properties, such as yielding and work hardening characteristics. Indeed, there has been considerable progress in that area recently, using FEM simulation to predict indentation outcomes, evaluating the "goodness of fit" for particular sets of parameter values and converging on a best-fit combination. A similar approach can be used to obtain superelastic parameters, but little work has been done hitherto on sensitivities, uniqueness characteristics or optimal methodologies and the procedures are complicated by limitations to the constitutive laws in current use. The current work presents a comprehensive examination of the issues involved, using experimental (uniaxial and indentation) data for a NiTi Shape Memory Alloy. It was found that it is possible to obtain the superelastic parameter values using a single indenter shape (spherical). Information is also presented on sensitivities and the probable reliability of such parameters obtained in this way for an unknown material.
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Aun, Diego Pinheiro. "Flexible TiO₂ coating on superelastic NiTi alloys for bioapplications." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI098.

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Dans cette étude, nous avons élaboréun revêtementde TiO₂ par sol-gel sur des alliages super-élastiques de NiTi. L’idée générale était de développer couche mince de TiO₂ protectrice et flexible. Le film mince est formé en immergeant les échantillons de NiTi, préalablement chimiquement gravés, dans une solution réactive à 7,5 mm/s, puis en effectuant plusieurs traitements thermiques :un premier traitement thermique à 100 °C pendant 45 minutes dans une atmosphère humide, un deuxième traitement à 110 °C pendant 2 heures dans une atmosphère sèche et enfin un dernier traitement à 500 °C pendant 10 minutes. Les couches minces de TiO₂ ont été caractérisé par de la flexion trois points, par MEB, par MET, par AFM, par GIXRD, par XPS et par de la cartographie Raman. Les résultats de l’étude ont montré un film nanocomposite, avec ~100nmde TiO2 amorphe formé à l’interface externe de la couche et d'un mélange de grains cristallisés de ~10 nm, d'anatase et de rutile à l'interface interne métal/oxyde.Cette hétéro-structure est capable de soutenir 6,4% de déformation sans l’apparition de défauts plastiques majeurs (cloques, fissures...). Une faible concentration de Ni a été observé au niveau de la surface externe des couches minces de TiO₂, ce qui se traduit par une augmentation de la biocompatibilité du matériau. La technique sol-gel a été utilisée pour revêtir des instruments endodontiques de RaCe. Ce deuxième système a été testé à la fois en fatigue pour estimer sa durée de vie, et à la résistance à la corrosion en NaClO, et à des températures correspondant aux transformations de phase. Les résultats ont montré une augmentation statistiquement significative de la durabilité en fatigue, en particulier après les essais de corrosion. L'efficacité de la « coupe », mesurée par une procédure originale, a été similaire aux instruments revêtus et non revêtus. Le traitement thermique n'a pas été suffisant efficient pour modifier de façon significative les températures de transformation de phase : le comportement mécanique d'origine de l'instrument a été maintenu
In this work, a dip-coating sol-gel deposition route was developed to coat superelastic NiTi alloy with a flexible TiO₂ protective layer. The film was formed by emerging the samples at 7.5 mm/s and thermally treating at 100ºC in a humid atmosphere for 45 min, 110ºC in a dry atmosphere for 2 hours and at 500ºC for 10 minutes.The film was first deposited over chemically etched substrates and characterized by SEM, TEM, AFM, GIXRD, XPS, Raman cartographyand three-point bending tests. Results showed that a ~100 nm nanocomposite film constituted of amorphous TiO₂ on the upper half and a mixture of ~10 nm anatase and rutile grains on the oxide/metal interfacewas formed. This film was capable of sustaining up to 6.4% strain without cracking or peeling. A high decrease in the concentration of Ni at the surface was measured, indicating an that an increase in the biocompatibilityof the material was achieved. This route was used to coat RaCe endodontic instruments, which were tested regarding fatigue life, cutting efficiency and corrosion resistance in NaClO. Results showed a statistically significant improvement in fatigue life for the coated instruments, mainly after corrosion tests. Cutting efficiency measured by an original developed technique was similar for coated and uncoated samples
Neste trabalho foi desenvolvida uma rota de deposição sol-gel por imersão para revestirligas de NiTi superelásticas com uma camada protetora e flexível de TiO2. O filmeformado pela emersão de amostras a 7,5 mm/s seguida de tratamentos térmicos a 100ºCpor 45 minutos em atmosfera úmida, 110ºC por 2 horas em atmosfera seca e 500ºC por10 minutos. O filme foi depositado sobre substratos decapados quimicamente ecaracterizados por MEV, MET, AFM, GIXRD, XPS, cartografia Raman e dobramentode três pontos. Resultados mostraram que um filme nanocompósito com ~100 nmconstituído de TiO2 amorfo na metade superior e uma mistura de grãos de 10 a 50 nmde anatase e rutila na interface metal/óxido foi formado. Este filme é capaz de sustentar6,4% de deformação sem trincar ou descamar. Uma grande redução na concentração deNi na superfície foi detectada, indicando um aumento na biocompatibilidade domaterial. A rota foi usada para revestir instrumentos endodônticos de NiTi modeloRaCe 25/0.06 que foram testados em relação à vida em fadiga, eficiência de corte,resistência à corrosão em NaClO. Detectou-se um aumento estatisticamentesignificativo na vida em fadiga, especialmente após os ensaios de corrosão. A eficiênciade corte, medida por um procedimento original desenvolvido, foi similar parainstrumentos revestidos e não revestidos. O tratamento térmico não foi suficiente paraalterar significativamente as temperaturas de transformação de fases, mantendo ocomportamento mecânico original do instrumento
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Yeung, Wai-kwok Kelvin. "Gradual scoliosis correction by use of a superelastic alloy." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23273720.

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Li, Zhiqi. "Experimental investigation on phase transformation of superelastic NiTi microtubes /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?MECH%202002%20LI.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2002.
Includes bibliographical references (leaves 155-160). Also available in electronic version. Access restricted to campus users.
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Books on the topic "Superelastic"

1

Yamauchi, K. Shape memory and superelastic alloys: Technologies and applications. Cambridge, UK: Woodhead Publishing, 2011.

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International Conference on Shape Memory and Superelastic Technologies (2007 Tsukuba, Japan). SMST-2007: Proceedings of the International Conference on Shape Memory and Superelastic Technologies, December 2-5, 2007, Tsukuba, Japan. Edited by Miyazaki Shuichi. Materials Park, Ohio: ASM International, 2008.

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International Conference on Shape Memory and Superelastic Technologies (2004 Baden-Baden, Germany). SMST-2004: Proceedings of the International Conference on Shape Memory and Superelastic Technologies, October 3-7, 2004, Kurhaus Baden-Baden, Baden-Baden, Germany. Edited by Mertmann Matthias. Materials Park, OH: ASM International, 2006.

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International Conference on Shape Memory and Superelastic Technologies (2006 Pacific Grove, Calif.). SMST-2006: Proceedings of the International Conference on Shape Memory and Superelastic Technologies, May 7-11, 2006, Asilomar Conference Center, Pacific Grove, California, USA. Edited by Berg Brian, Mitchell M. R. 1941-, and Proft Jim. Materials Park, OH: ASM International, 2008.

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International, Conference on Shape Memory and Superelastic Technologies and Shape Memory Materials (2001 Kunming China). Shape memory materials and its applications: Proceedings of the International Conference on Shape Memory and Superelastic Technologies and Shape Memory Materials (SMST-SMM 2001), held in Kunming, China, September 2 to 6, 2001. Uetikon-Zuerich, Switzerland: Trans Tech Publications, 2002.

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Yamauchi, K., I. Ohkata, K. Tsuchiya, and S. Miyazaki. Shape memory and superelastic alloys. Woodhead Publishing Limited, 2011. http://dx.doi.org/10.1533/9780857092625.

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Shape Memory and Superelastic Technologies. 2003. TIPS Technical Publishing Inc, 2004.

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Miyazaki, S., I. Ohkata, K. Tsuchiya, and K. Yamauchi. Shape Memory and Superelastic Alloys: Applications and Technologies. Elsevier Science & Technology, 2011.

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Tsuchiya, K., K. Yamauchi, I. Ohkata, and S. Miyazaki. Shape Memory and Superelastic Alloys: Applications and Technologies. Woodhead Publishing, 2016.

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Pelton, Alan R., Darel Hodgson, and Tom Duerig. Proceedings of the 1st International Conference on Shape Memory and Superelastic Technologies (Smst-94). Monterey Institute of Advanced Studies., 1995.

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Book chapters on the topic "Superelastic"

1

Slutsker, J., and A. L. Roytburd. "Modeling of Superelastic Adaptive Composites." In Solid Mechanics and Its Applications, 147–54. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-0069-6_18.

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Perry, Kenneth E., and Alex Teiche. "Fatigue Crack Initiation in Superelastic Nitinol." In Fatigue and Fracture Metallic Medical Materials and Devices, 35–52. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2013. http://dx.doi.org/10.1520/stp155920130030.

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Eiselstein, L. E. "Corrosion of Shape Memory and Superelastic Alloys." In Uhlig's Corrosion Handbook, 529–47. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470872864.ch38.

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Capitelli, Mario, Roberto Celiberto, Gianpiero Colonna, Fabrizio Esposito, Claudine Gorse, Khaled Hassouni, Annarita Laricchiuta, and Savino Longo. "Superelastic Collisions and Electron Energy Distribution Function." In Fundamental Aspects of Plasma Chemical Physics, 113–42. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4419-8185-1_5.

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Quandt, Eckhard, and C. Zamponi. "Superelastic NiTi Thin Films for Medical Applications." In Advances in Science and Technology, 190–97. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908158-16-8.190.

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Yan, Wen Yi, and Qing Ping Sun. "Spherical Indentation of Superelastic Shape Memory Alloys." In Advances in Composite Materials and Structures, 601–4. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.601.

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Sangeetha, M., P. Ponnusamy, Durgajeevitha, and S. Shiva Ganesh. "Experimental Study on Mechanical Properties of Superelastic Alloy." In Lecture Notes in Mechanical Engineering, 493–502. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6374-0_55.

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Heller, L., B. Marvalová, J. Vlach, K. Janouchová, M. Syrovátková, and J. Hanuš. "Damping Capacity of Superelastic Nickel-Titanium Plain Textiles." In Springer Proceedings in Physics, 565–72. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2069-5_76.

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Zickel, Michael J., and Christopher S. Welch. "Thermoelastic Coating Characterization using a Superelastic NiTi Alloy." In Review of Progress in Quantitative Nondestructive Evaluation, 1821–28. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1987-4_233.

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Kazakevičiūtė-Makovska, Rasa, and Holger Steeb. "Micromechanical Bases of Superelastic Behavior of Certain Biopolymers." In Advanced Structured Materials, 175–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19219-7_8.

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Conference papers on the topic "Superelastic"

1

DellaCorte, Christopher, Malcolm K. Stanford, Richard A. Manco, and Fransua Thomas. "Design Considerations for Resilient Rolling Element Bearings Made From Low Modulus Superelastic Materials." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61128.

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Nickel-titanium based superelastic materials are emerging as candidates for rolling element-bearing applications [1]. When properly prepared, these unique intermetallics are hard, exhibit excellent tribological properties and are intrinsically corrosion immune [2]. In addition, recent investigations have revealed that, unlike traditional bearing steels, superelastics can endure much higher levels of recoverable elastic strain during compressive deformation [3]. This behavior enables bearings that are more resilient to load induced damage such as raceway denting and from the ingestion of hard particles. Despite these positive attributes, these alloys differ significantly from conventional steels and these differences must be carefully considered to achieve successful applications. These differences include reduced elastic modulus, high hardness and enhanced resistance to indentation loads. The current paper introduces nickel-titanium based superelastic bearing materials and compares their properties to current bearing materials. General bearing design practices and manufacturing processes are also examined to identify and explore the challenges and opportunities for making resilient rolling element bearings utilizing this new class of superelastic materials.
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Muir Wood, A. J., J. H. You, and T. W. Clyne. "Nanoindention response of superelastic materials." In Smart Materials, Nano-, and Micro-Smart Systems, edited by Alan R. Wilson. SPIE, 2004. http://dx.doi.org/10.1117/12.581906.

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Liu, Jiening, Benjamin Hall, Mary Frecker, and Edward W. Reutzel. "Compliant Articulation Structure Using Superelastic NiTiNOL." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7970.

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A device that can provide articulation to surgical tool tips is needed in natural orifice transluminal endoscopy surgery (NOTES). In this paper, we propose a compliant articulation structure that uses superelastic NiTiNOL to achieve a large deflection angle and force in a compact size. Six geometric parameters are used to define this structure, and constraints based on the fabrication process are imposed. Using finite element analysis, a family of designs is evaluated in terms of the free deflection angle and blocked force. The same family of designs is evaluated for both NiTiNOL and stainless steel. It can be seen that significant benefits are observed when using NiTiNOL compared to 316 stainless steel; a maximum free deflection angle of 64.8° and maximum blocked force of 24.7 N are predicted. The designs are refined to avoid stress concentrations, and design guidelines are recommended. The meso-scale articulation structure is fabricated using both a Coherent Avia Q-switched, 355 nm laser and a Myachi Unitek 200 W single mode pulsed fiber laser with active water cooling. Select fabricated structures are then tested to validate the finite element models.
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Rivin, Eugene I., Gautam Sayal, and Prithvi R. Singh Johal. "Structural applications of SMA/superelastic materials." In Smart Structures and Materials, edited by William D. Armstrong. SPIE, 2005. http://dx.doi.org/10.1117/12.596511.

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Reedlunn, Benjamin, Christopher Churchill, Emily Nelson, Samantha Daly, and John Shaw. "Bending of Superelastic Shape Memory Alloy Tubes." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4906.

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Many shape memory alloy (SMA) applications exploit superelasticity in a bending mode, yet the large displacements and rotations associated with bending of slender structures make controlled experiments difficult. A custom pure bending fixture was built to perform experiments on superelastic NiTi tubes. To understand the bending results, the tubes were also characterized in uniaxial tension and compression, where a custom fixture was utilized to avoid buckling. In addition to measuring the global mechanical response, stereo digital image correlation (DIC) was used in all the experiments to capture the local surface displacement and strain fields. Consistent with the tension/compression data, our bending experiments showed a significant shift of the neutral axis towards the compression side. Also, the tube had strain localization on the tension side, but no such localization on the compression side. Detailed analysis of the strain distribution across the tube diameter revealed that the usual assumption of beam theory, that plane sections remain plane, did not hold along the tension side. Averaged over a few diameters of gage length, plane sections remain plane is a reasonable assumption and can be used to predict the global moment–curvature response. However, this assumption should be used with caution since it can under/over predict local strains by as much as 2× due to the localized deformation morphology.
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Karbaschi, Zohreh, and Mohammad Elahinia. "Modeling the Torsional Behavior of Superelastic Wires." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5174.

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Torsional behavior of shape memory alloys can be employed in different biomedical applications. The goal of this paper is to investigate the behavior of these alloys under torsional loading conditions. To this end a torsional model is developed in MATLAB, in which a uniaxial model is extended to predict the torque-angle behavior of superelastic wires/rods. Tensile and torsional testing are performed on NiTi wires to determine martial properties and to verify this model. The material properties are determined based on ASTM standards. The effect of different parameters such as lengths and radii on the torque-angle behavior are investigated with the model. Moreover, the effect of temperature on the torsional behavior of SMA wires are presented.
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Yang, Miao, Junxian Lin, Zhijiang Du, and Wei Dong. "Nonlinear Deformation Analysis of Superelastic Flexure Hinges." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59498.

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The motion capability of a flexure hinge made of shape memory alloy (SMA) can be greatly improved because of the material’s superelasticity. In this paper, the nonlinear deformation characteristics of a superelastic flexure hinge are analyzed. The flexure hinge is considered as a non-prismatic cantilever beam subjected to a combined load at the free end. Superelastic behavior of the SMA is represented by Auricchio’s constitutive model. Govern equations of the large deformation superelastic flexure hinge are derived by using the Bernoulli-Euler beam theory and solved numerically. Based on the static deformation model, the rotation capacity, the stiffness characteristic and the rotation error of the flexure hinge are discussed respectively. Numerical examples compared with Finite Element analysis (FEA) show the accuracy of the proposed methodology.
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Nishino, Toshiki, and Akihiro Matsuura. "Magic Bounce: Playful Interaction on Superelastic Display." In 2020 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW). IEEE, 2020. http://dx.doi.org/10.1109/vrw50115.2020.00191.

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Viet, N. V., Wael Zaki, and Rehan Umer. "Analytical Model for a Superelastic SMA Beam." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3763.

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We propose an analytical model for a superelastic shape memory alloy (SMA) beam. The model considers reversible phase transformation between austenite and a single martensite variant driven by mechanical loading/unloading. In particular, we consider a cantilever beam subjected to a concentrated transverse force acting at the tip. The force is gradually increased from zero to a maximum value sufficient to cause complete transformation of the initially austenitic phase into martensite away from the beam core. The force is then gradually removed, resulting in complete strain recovery. In each stage of the loading/unloading process, an analytical relation is established between bending moment and curvature in terms of position along the axis of the beam. The model is compared to a uniaxial numerical beam model and to finite element analysis (FEA) results for the same beam in 3D, with very good agreement in each case. The moment-curvature relation is then integrated to obtain a nonlinear expression for the deflection and stress distribution in terms of position along the length of the beam. The expression is validated against 3D simulation results.
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Koon, Henry, Jack Laven, and Julianna Abel. "Manufacture of Ultra-Dense Knitted Superelastic Structures." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8225.

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Knitted Textiles made from Nickel-Titanium (NiTi) shape memory alloy wires are a new structural element with enhanced properties for a variety of applications. Potential advantages of this structural form include enhanced bending flexibility, tailorable in-plane, and through-thickness mechanical performance, and energy absorption and damping. Inspection of the knit pattern reveals a repeating cell structure of interlocking loops. Because of this repeating structure, knits can be evaluated as cellular structures that leverage their loop-based architecture for mechanical robustness and flexibility. The flexibility and robustness of the structure can be further enhanced by manufacturing with superelastic NiTi. The stiffness of superelastic NiTi, however, makes traditional knit manufacturing techniques inadequate, so knit manufacturing in this research is aided by shape setting the superelastic wire to a predefined pattern mimicking the natural curve of a strand within a knit fabric. This predefined shape-set geometry determines the outcome of the knit’s mechanical performance and tunes the mechanical properties. In this research, the impact of the shape setting process on the material itself is explored through axial loading tests to quantify the effect that heat treatment has on a knit sample. A means of continuously shape setting and feeding the wire into traditional knitting machines is described. These processes lend themselves to mass production and build upon previous textile manufacturing technologies. This research also proposes an empirical exploration of superelastic NiTi knit mechanical performance and several new techniques for manufacturing such knits with adjustable knit parameters. Displacement-controlled axial loading tests in the vertical (wale) direction determined the recoverability of each knit sample in the research and were iteratively increased until failure resulted. Knit samples showed recoverable axial strains of 65–140%, which could be moderately altered based on knit pattern and loop parameters. Furthermore, this research demonstrates that improving the density of the knit increases the stiffness of the knit without any loss in recoverable strains. These results highlight the potential of this unique structural architecture that could be used to design fabrics with adjustable mechanical properties, expanding the design space for aerospace structures, medical devices, and consumer products.
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