Journal articles: 'Shape Memory Alloy'

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Paton, B. E., D. M. Kaleko, S. N. Kedrovsky, Yu N. Koval, I. V. Krivtsun, and V. N. Slepchenko. "Resistance welding of shape-memory copper-aluminium alloy." Paton Welding Journal 2015, no. 12 (December 28, 2015): 2–7. http://dx.doi.org/10.15407/tpwj2015.12.01.

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FUKUYO, HIROO. "Shape memory alloy implant." Nihon Hotetsu Shika Gakkai Zasshi 31, no. 6 (1987): 1354–63. http://dx.doi.org/10.2186/jjps.31.1354.

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Bellouard, Yves, and Reymond Clavel. "Shape memory alloy flexures." Materials Science and Engineering: A 378, no. 1-2 (July 2004): 210–15. http://dx.doi.org/10.1016/j.msea.2003.12.062.

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Pruski, A., and H. Kihl. "Shape memory alloy hysteresis." Sensors and Actuators A: Physical 36, no. 1 (March 1993): 29–35. http://dx.doi.org/10.1016/0924-4247(93)80137-6.

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Bergamasco, M., P. Dario, and F. Salsedo. "Shape memory alloy microactuators." Sensors and Actuators A: Physical 21, no. 1-3 (February 1990): 253–57. http://dx.doi.org/10.1016/0924-4247(90)85049-a.

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Planes, Antoni, and Lluís Mañosa. "Ferromagnetic Shape-Memory Alloys." Materials Science Forum 512 (April 2006): 145–52. http://dx.doi.org/10.4028/www.scientific.net/msf.512.145.

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The magnetic shape-memory effect is a consequence of the coupling between magnetism and structure in ferromagnetic alloys undergoing a martensitic transformation. In these materials large reversible strains can be magnetically induced by the rearrangement of the martensitic twin-variant structure. Several Heusler and intermetallic alloys have been studied in connec- tion with this property. In this paper we will focus on the Ni-Mn-Ga Heusler alloy which is considered to be the prototypical magnetic shape-memory alloy. After a brief summary of the general properties of this class of materials, we will present recent results of relevance for the understanding of the effect of magnetism on the martensitic transformation. Finally, we will discuss the requirements for the occurrence of the magnetic shape-memory effect.

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

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Liu, Bingfei, Qingfei Wang, Kai Yin, and Liwen Wang. "An analytical model for crack monitoring of the shape memory alloy intelligent concrete." Journal of Intelligent Material Systems and Structures 31, no. 1 (October 16, 2019): 100–116. http://dx.doi.org/10.1177/1045389x19880010.

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A theoretical model for the crack monitoring of the shape memory alloy intelligent concrete is presented in this work. The mechanical properties of shape memory alloy materials are first given by the experimental test. The one-dimensional constitutive model of the shape memory alloys is reviewed by degenerating from a three-dimensional model, and the behaviors of the shape memory alloys under different working conditions are then discussed. By combining the electrical resistivity model and the one-dimensional shape memory alloy constitutive model, the crack monitoring model of the shape memory alloy intelligent concrete is given, and the relationships between the crack width of the concrete and the electrical resistance variation of the shape memory alloy materials for different crack monitoring processes of shape memory alloy intelligent concrete are finally presented. The numerical results of the present model are compared with the published experimental data to verify the correctness of the model.

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Chan, Kuen Cheong, and Li Min Zhou. "Static Behaviours of Carbon Fibre Composite Strip with Bifurcated Type Shape Memory Alloy Pins." Key Engineering Materials 334-335 (March 2007): 1153–56. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.1153.

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A numerical study of the static behaviours of composite strip with bifurcated type shape memory alloy pins has been conducted. The case of bifurcated type shape memory alloy pins inserted inside the composite strip around the hole to reinforce the laminate, which was subjected to the axial stress was simulated. The models for stress analysis were established by using ANSYS finite element programme. Two types of shape memory alloy pins were proposed to insert along the through thickness direction of the carbon fibre woven fabric composite strip to induce the clamping force. The pre-tensioned load was applied to the shape memory alloy pins in order to reduce occurrence of delamination in the laminate. Three-dimensional elements and contact elements were used to simulate the contact between the composite laminate and shape memory alloy pin to investigate the stress distribution around the hole in the composite strip. The effect of pre-strain of shape memory alloy on the stresses inside composite was studied. The results show that the stress characteristics of the button-shaped and bifurcated shape memory alloy pin models are similar; however, the stresses for the button-shaped pin model are lower. The tensile and compressive stresses, both in button-shaped and bifurcated pin models, are strongly dependent on the percentage of pre-strain of the shape memory alloy. It is therefore concluded that the shape memory alloy pin method was significantly reduced the stress concentration of the composite strip laminate.

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Xu, Hua Ping, Gao Feng Song, and Xie Min Mao. "Influence of Be and Ni to Cu-Al Alloy Shape Memory Performance." Advanced Materials Research 197-198 (February 2011): 1258–62. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1258.

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With Bridgeman directional solidification method the single crystal alloys of CuAl base shape memory alloy (SMA) with different components were prepared. And their shape memory performance characters were systematically investigated. The results show that the single crystal of CuAlNiBe quaternary shape memory alloy has much better shape memory properties than that of the CuAlBe and CuAlNi ternary alloy. That meant that in the CuAl base SMA alloy the mixed addition of Be and Ni changed the quenching microstructure has a strengthening effect to improve the shape memory performance of the SMA alloy.

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Hong, Sung-Hwan, Hae-Jin Park, Gi-An Song, and Ki-Buem Kim. "Recent Developments in Ultrafine Shape Memory Alloys Using Amorphous Precursors." Materials 16, no. 23 (November 24, 2023): 7327. http://dx.doi.org/10.3390/ma16237327.

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In this review, we systematically reviewed the recent advances in the development of ultrafine shape memory alloys with unique shape memory effects and superelastic behavior using amorphous metallic materials. Its scientific contribution involves defining and expanding the range of fabrication methods for single-phase ultrafine/nanocrystalline alloys with multicomponent systems. In multicomponent amorphous alloys, the crystallization mechanism depends on the alloy composition and is a selectable factor in the alloy designing method, considering the thermodynamic and physical parameters of constituent elements. The crystallization kinetics can be controlled by modulating the annealing condition in a supercooled liquid state with consideration of the crystalline temperature of the amorphous alloys. The phase stability of austenite and martensite phases in ultrafine shape memory alloys developed from amorphous precursors is determined according to alloy composition and grain size, which strongly influence the shape memory effect and superelastic behavior. A methodological framework is subsequently suggested to develop the ultrafine shape memory alloys based on the systematic alloy designing method, which can be considered an important strategy for developing novel ultrafine/nanocrystalline shape memory alloys with excellent shape memory and superelastic effects.

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Yang, Kaike, Junpeng Luo, Zhaoting Yuan, Wenjing Ma, Jie Hou, Xiaojun Gu, Deen Wang, and Qiang Yuan. "Topology Optimization of Shape Memory Alloy Actuators for Prescribed Two-Way Transforming Shapes." Actuators 13, no. 2 (February 11, 2024): 65. http://dx.doi.org/10.3390/act13020065.

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This paper proposes a new topology optimization formulation for obtaining shape memory alloy actuators which are designed with prescribed two-way transforming shapes. The actuation behaviors of shape memory alloy structures are governed by austenite-martensite phase transformations effected by thermal-mechanical loading processes; therefore, to realize the precise geometric shape variations of shape memory alloy actuators, traditional methods involve iteration processes including heuristic structural design, numerical predictions and experimental validation. Although advanced structural optimization methods such as topology optimization have been used to design three-dimensional (3D) shape memory alloy actuators, the maximization/minimization of quantities such as structural compliance or inaccurate stroke distances has usually been selected as the optimization objective to obtain feasible solutions. To bridge the gap between precise shape-morphing requirements and efficient shape memory alloy actuator designs, this paper formulates optimization criteria with quantitatively desired geometric shapes, and investigates the automatic designs of two-way prescribed shape morphing shape memory alloy structures based on the proposed topology optimization method. The super element method and adjoint method are used to derive the analytical sensitivities of the objective functions with respect to the design variables. Numerical examples demonstrate that the proposed method can obtain 3D actuator designs that have the desired two-way transforming shapes.

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Abu Al Timan, Jamal A., Iman M. Al Zaka, and Baidaa M. Zeidan. "Hyflex CM and EDM from Shape Memory to Control Memory." Erbil Dental Journal 6, no. 2 (December 30, 2023): 171–74. http://dx.doi.org/10.15218/edj.2023.18.

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The new era in endodontics has been established with the introduction of nickel titanium (NiTi) alloys, and later on the automation of mechanical preparation. By changing the phase transformation temperatures of NiTi alloy, the manufacturers alter the phase composition to have a NiTi with new mechanical properties. These mechanical properties can be achieved either by thermal, mechanical treatments or both. Moreover, many machining procedures (e.g. twisting, electrical discharge machining), were developed. The higher flexibility of thermomechanically treated NiTi alloys was found as the main advantages of these alloys with the improvement of cyclic fatigue resistance when compared to conventional NiTi. Austenitic alloys have superelastic properties due to stress-induced martensite transformation and consequently try to springback to their original shape after distortion. In contrast, the martensitic instruments have ability to reorientation of martensite variants when heated. So these instruments easily deformed and show a shape memory effect. Moreover, the use of martensitic alloy results in more flexible files, with an increased cyclic fatigue resistance compared with austenitic alloy. So, continued development in the manufacturing treatment of NiTi alloys has resulted in the producing of controlled memory (CM) wire. These materials do not possess superelastic properties at neither room nor body temperature. This article reviews the development process, features and properties of Hyflex file and Hyflex EDM file made from CM wire. Keywords: NiTi alloy, CM wire, Hyflex EDM, Heat treated NiTi

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Xu, Hua Ping, Gao Feng Song, and Xie Min Mao. "A Study on Shape Memory Performance of Cu-Al-Ni-Be Alloy Single Crystal." Advanced Materials Research 287-290 (July 2011): 21–25. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.21.

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In this paper, single crystal of CuAlNiBe quaternary shape memory alloy was prepared in a high temperature gradient directional solidification furnace with a selective growing crystallizer. And its shape memory performance characters were systematically compared with other series copper base shape memory alloys. The results show that the single crystal of CuAlNiBe quaternary shape memory alloy has better shape memory properties.

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Jung, Beom-Seok, Jung-Pyo Kong, NingXue Li, Yoon-Mi Kim, Min-Saeng Kim, Sung-Hoon Ahn, and Maenghyo Cho. "Numerical simulation and verification of a curved morphing composite structure with embedded shape memory alloy wire actuators." Journal of Intelligent Material Systems and Structures 24, no. 1 (September 21, 2012): 89–98. http://dx.doi.org/10.1177/1045389x12459588.

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Shape memory alloys have been actively studied in various fields in an attempt to utilize their high energy density. In particular, shape memory alloy wire-embedded composites can be used as load-bearing smart actuators without any additional manipulation, in which they act like a hinge joint. A shape memory alloy wire-embedded composite is able to generate various deformation behaviors via the combination of its shape memory alloy and matrix materials. Accordingly, a study of the various design parameters of shape memory alloy wire-embedded composites is required to facilitate the practical application of smart structures. In this research, a numerical simulation of a shape memory alloy wire-embedded composite is used to investigate the deformation behavior of a composite panel as a function of the composite width per shape memory alloy wire, composite thickness, and the eccentricity of the shape memory alloy wire. A curved morphing composite structure is fabricated to confirm the results of the numerical simulation. The deformation of the shape memory alloy wire-embedded composite panel is determined by measuring its radius of curvature. The simulated deformation behaviors are verified with the experimental results. In addition, an analysis of the deformation and internal stress of the composites is carried out. It can be used to obtain guidelines for the mechanical design of shape memory alloy wire-embedded composite panels.

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Gol Zardian, Mohsen, Navid Moslemi, Farzin Mozafari, Soheil Gohari, Mohd Yazid Yahya, Colin Burvill, and Amran Ayob. "Flexural and free vibration control of smart epoxy composite beams using shape memory alloy wires actuator." Journal of Intelligent Material Systems and Structures 31, no. 13 (June 1, 2020): 1557–66. http://dx.doi.org/10.1177/1045389x20922899.

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Shape memory alloys are increasingly used in numerous smart engineering structures. This study experimentally investigates static flexural and free vibration characteristics of composite beams reinforced with shape memory alloy wires. The key to this study is using shape memory alloy fibers as a means for influencing and tuning the static and dynamic responses of structures. A series of static three-point bending and modal experiments is performed to capture the capability of shape memory alloy wires in controlling the static and dynamic responses of a reinforced beam. Static and dynamic behaviors of the fiber-reinforced beam with different volumetric fiber fractions are examined. Before heat excitation, increasing the number of shape memory alloy wires leads to higher beam stiffness and lower beam deflection. However, with both heat activation and the higher number of shape memory alloy wires, beam deflection is significantly reduced. The modal vibration tests demonstrated that when shape memory alloy wires are not activated, the magnitude of natural frequencies slightly decreases by increasing the number of shape memory alloy wires. However, with heat excitation, the higher number of shape memory alloy wires, in contrast, increases the magnitude of natural frequencies. Furthermore, the higher number of activated shape memory alloy wires shows to predominantly increase the magnitude of higher modes of vibration rather than lower modes.

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Rasid, Zainudin A., Rizal Zahari, Ayob Amran, Dayang Laila Majid, and Ahmad Shakrine M. Rafie. "Thermal Post-Buckling Improvements of Laminated Composite Plates Using the Active Strain Energy Tuning Approach." Advanced Materials Research 311-313 (August 2011): 2235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.2235.

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Shape memory alloy was firstly used commercially as a hydraulic coupling in the Grumman F14A in 1971. It is today used among others to improve structural behaviours such as buckling of composite plates in the aerospace vehicles. In this paper, finite element model and its source code for thermal post-buckling of shape memory alloy laminated composite plates is presented. The shape memory alloy wires induced stress that improved the strain energy, stiffness and thus the buckling behaviour of the composite plates. The finite element formulation catered the combined properties of the composite and shape memory alloys, the addition of the recovery stress and the temperature dependent properties of the shape memory alloys and the composite matrix. This study showed that by embedding shape memory alloy within layers of composite plates, post-buckling behaviours of composite plates can be improved substantially.

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Li, Canjun, Zhen Zhou, and Yazhi Zhu. "A uniaxial constitutive model for NiTi shape memory alloy bars considering the effect of residual strain." Journal of Intelligent Material Systems and Structures 30, no. 8 (March 13, 2019): 1163–77. http://dx.doi.org/10.1177/1045389x19835932.

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Super-elastic shape memory alloys are widely used in structural engineering fields due to their encouraging super-elasticity and energy dissipation capability. Large-size shape memory alloy bars often present significant residual strains after unloading, which emphasizes the necessity of developing a residual strain effect–coupled constitutive model to predict well the performance of shape memory alloy–based structures. First, this article experimentally studies the hysteretic behavior of NiTi shape memory alloy bars under quasi-static loading conditions and investigates the effects of cyclic numbers and strain amplitudes on residual strain. Second, a concept of cumulative transformation strain is preliminarily introduced into a phenomenological Lagoudas model. A uniaxial constitutive model for shape memory alloy bars including the residual strain is proposed. By using OpenSees platform, numerical simulations of shape memory alloy bars are conducted—the results of which indicate that the proposed model can accurately capture the hysteretic behavior of shape memory alloys. The predicted residual strains show a good agreement to experimental results, which demonstrates the desirable efficiency of the proposed model.

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Tian, Li, Guodong Gao, Canxing Qiu, and Kunjie Rong. "Effect of hysteresis properties of shape memory alloy-tuned mass damper on seismic control of power transmission tower." Advances in Structural Engineering 22, no. 4 (August 9, 2018): 1007–17. http://dx.doi.org/10.1177/1369433218791606.

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Statistics from past strong earthquakes revealed that electricity transmission towers were vulnerable to earthquake excitations. It is necessary to mitigate the seismic responses of power transmission towers to ensure the safety of such structures. In this research, a novel shape memory alloy-tuned mass damper is proposed, and seismic vibration control of power transmission tower using shape memory alloy-tuned mass damper based on three types of shape memory alloy materials (i.e. NiTi, M-CuAlBe, P-CuAlBe) is analyzed. The detailed three-dimensional finite element model of a power transmission tower incorporated with shape memory alloy-tuned mass damper is developed using numerical simulation software ANSYS. The control effects of shape memory alloy-tuned mass damper on the seismic vibration of power transmission tower are assessed using nonlinear time history analysis method. The interested seismic performance indices include displacement, acceleration, and base shear force. In addition to the shape memory alloy materials, the influence of seismic intensity and frequency ratio are conducted for the optimal design. It is shown that installing shape memory alloy-tuned mass damper well reduced the seismic responses of power transmission tower. The comparison between different shape memory alloys indicated that the damping of the shape memory alloy-tuned mass damper is beneficial to mitigate the vibrations.

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Feng, Xue, Li Min Zhao, and Xu Jun Mi. "Characristics of Shape Memory Composites Combined with Shape Memory Alloy and Shape Memory Polymer." Advanced Materials Research 705 (June 2013): 169–72. http://dx.doi.org/10.4028/www.scientific.net/amr.705.169.

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In order to develop high functionality of shape memory materials, the shape memory composites combined with TiNi wire and shape memory epoxy were prepared, and the mechanical and thermomechanical properties were studied. The results showed the addition of TiNi wire increased the Young modulus and breaking strength both at room temperature and at elevated temperature. The composites maintained the rates of shape fixity and shape recovery close to 100%. The maximum recovery stress increased with increasing TiNi wire volume fraction, and obtained almost 3 times of the matrix by adding 1vol% TiNi wire.

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Abuzaid, Wael, and Huseyin Sehitoglu. "Shape memory effect in FeMnNiAl iron-based shape memory alloy." Scripta Materialia 169 (August 2019): 57–60. http://dx.doi.org/10.1016/j.scriptamat.2019.05.006.

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Srivastava, Vijay, and Kanwal Preet Bhatti. "Ferromagnetic Shape Memory Heusler Alloys." Solid State Phenomena 189 (June 2012): 189–208. http://dx.doi.org/10.4028/www.scientific.net/ssp.189.189.

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Although Heusler alloys have been known for more than a century, but since the last decade there has been a quantum jump in research in this area. Heusler alloys show remarkable properties, such as ferromagnetic shape memory effect, magnetocaloric effect, half metallicity, and most recently it has been shown that it can be used for direct conversion of heat into electricity. Heusler alloys Ni-Mn-Z (Z=Ga, Al, In, Sn, Sb), show a reversible martensitic transformation and unusual magnetic properties. Other classes of intermetallic Heusler alloy families that are half metallic (such as the half Heusler alloys Ni-Mn-Sb and the full Heusler alloy Co2MnGe) are attractive because of their high Curie temperature and structural similarity to binary semiconductors. Unlike Ni-Mn-Ga, Ni-Mn-In and Ni-Mn-Sn transform from ferromagnetic austenite to non-ferromagnetic martensite. As is consistent with the Clausius-Clapeyron equation, the martensitic phase transformation can be manipulated by a magnetic field, leading to possible applications of these materials enabling the magnetic shape memory effect, energy conversion and solid state refrigeration. In this paper, we summarize the salient features of Heusler alloys, like the structure, magnetic properties and potential application of this family of alloys in industry.

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Hosseini, M., P. Beiranvand, A. Dehestani, and K. Dehestani. "Shape memory alloys and offering superelastic property opportunity in reinforced concrete structures." Archives of Materials Science and Engineering 85, no. 1 (May 1, 2017): 5–13. http://dx.doi.org/10.5604/01.3001.0010.1553.

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Purpose: The effect of shape memory and super-elastic property are two exclusive features in shape memory alloys. To exploit the properties of shape memory effect, alloy needs to be heated, but super-elastic property in these alloys will be proposed automatically in case suitable conditions. Design/methodology/approach: In this study, with simulating short-square reinforced concrete column experimental model in software ANSYS and in multi-level and increasing process, longitudinal armatures with shape memory alloy material will replace steel armatures with super-elastic behavior will be investigated with making shape memory alloy kind as variable (copper and nickel-based alloys), the opportunity of super-elastic property emergence in these alloys and with playing the role of longitudinal armature in reinforced concrete column. Findings: It can generally be said that memory alloy will achieve to goal that its created stresses will be located among stress of beginning direct phase and stress of finishing direct phase and whatever these stresses are closer to finishing direct phase, alloy will have more efficiency to propose its super-elastic property. Research limitations/implications: In case of using shape memory alloys as longitudinal armatures in reinforced concrete structures considering them buried in concrete, exploitation of shape memory property will have its particular problems that these problems won’t happen about the super-elastic property. Considering the high rate of strain capacity (3 to 8%) in memory alloys with super-elastic behaviour and the limitation of this capacity in concrete, conditions are necessary to be prepared in a way that memory alloy has the opportunity to propose super-elastic property. Originality/value: Except shape memory alloy that has proposing super-elastic behaviour in concrete structures and is investigated in this study, other factors such as the rate of resistance characteristic of pressure of concrete and mechanical characteristics of steel armatures are effective in this case as well that can be good subjects for investigation.

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XIONG, JIANYU, YUNCANG LI, PETER D. HODGSON, and CUI'E WEN. "INFLUENCE OF POROSITY ON SHAPE MEMORY BEHAVIOR OF POROUS TiNi SHAPE MEMORY ALLOY." Functional Materials Letters 01, no. 03 (December 2008): 215–19. http://dx.doi.org/10.1142/s1793604708000332.

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Porous Ti -50.5at.% Ni shape memory alloy (SMA) samples with a range of porosities were prepared by spacer sintering. The porous structure of the alloy was examined using scanning electron microscopy (SEM). The phase constituents of the porous TiNi alloy were determined by X-ray diffraction (XRD). The shape memory behavior of the porous TiNi alloy was investigated using loading–unloading compression tests. Results indicate that the porous TiNi alloy exhibits superelasticity and the recoverable strain by the superelasticity decreases with the increase of porosity. After a prestrain of 7%, the superelastically recovered strains for the porous TiNi alloy samples with porosities of 46%, 59%, 69% and 77% are 2.0%, 1.8%, 1.5% and 1.3%, respectively. The pores in the TiNi alloy samples cause stress/strain concentration, as well as crack initiation, which adversely affect the shape memory behavior of the porous TiNi alloy.

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Ostertag, Oskar, and Eva Ostertagová. "Shape Memory Alloy Actuator (SMA)." Applied Mechanics and Materials 816 (November 2015): 9–15. http://dx.doi.org/10.4028/www.scientific.net/amm.816.9.

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Our article deals with the possibility of using shape memory material (SMA − Shape Memory Alloy) to create an actuator of the mechanical element. The biggest advantage of the SMA actuators compared to those made of conventional materials is that they have the ability to generate relatively great force, are of low weight and small size.

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Clithy, Eva. "Application of Shape Memory Alloy." Science Insights 33, no. 3 (May 30, 2020): 167–74. http://dx.doi.org/10.15354/si.20.re072.

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YAMAUCHI, Kiyoshi. "Fabrication of Shape Memory Alloy." Journal of the Society of Mechanical Engineers 107, no. 1028 (2004): 521–22. http://dx.doi.org/10.1299/jsmemag.107.1028_521.

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Calin, M., N. Chaillet, J. Agnus, A. Bourjault, A. Bertsch, S. Zissi, and L. Thiery. "Shape Memory Alloy Compliant Microrobots." IFAC Proceedings Volumes 31, no. 15 (June 1998): 241–48. http://dx.doi.org/10.1016/s1474-6670(17)40560-x.

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Sharma, S. V., M. M. Nayak, and N. S. Dinesh. "Shape memory alloy based motor." Sadhana 33, no. 5 (October 2008): 699–712. http://dx.doi.org/10.1007/s12046-008-0052-z.

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Mori, Kiyotaka, Jian Li, Alexander L Roytburd, and Manfred Wuttig. "Patterned Shape Memory Alloy Films." MATERIALS TRANSACTIONS 43, no. 5 (2002): 951–55. http://dx.doi.org/10.2320/matertrans.43.951.

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Liang, C., and C. A. Rogers. "Design of Shape Memory Alloy Springs With Applications in Vibration Control." Journal of Vibration and Acoustics 115, no. 1 (January 1, 1993): 129–35. http://dx.doi.org/10.1115/1.2930305.

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Shape memory alloys (SMAs) have several unique characteristics, including their Young’s modulus-temperature relations, shape memory effects, and damping characteristics. The Young’s modulus of the high-temperature austenite of SMAs is about three to four times as large as that of low-temperature martensite. Therefore, a spring made of shape memory alloy can change its spring constant by a factor of three to four. Since a shape memory alloy spring can vary its spring constant, provide recovery stress (shape memory effect), or be designed with a high damping capacity, it may be useful in adaptive vibration control. Some vibration control concepts utilizing the unique characteristics of SMAs will be presented in this paper. Shape memory alloy springs have been used as actuators in many applications although their use in the vibration control area is very recent. Since shape memory alloys differ from conventional alloy materials in many ways, the traditional design approach for springs is not completely suitable for designing SMA springs. Some design approaches based upon linear theory have been proposed for shape memory alloy springs. A more accurate design method for SMA springs based on a new nonlinear thermomechanical constitutive relation of SMA is also presented in this paper.

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

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Shape memory alloys (SMAs) have the disadvantage that cooling is difficult and the actuating speed during cooling is slow. To resolve this problem, shape memory material actuators that operate only with heating is required. SMAs are characterized by a low apparent Young's modulus below the transformation temperature and a strong shape recovery force above the reverse transformation temperature. Alternatively, shape memory polymers (SMPs) have two properties: shape fixability and shape recovery. The SMPs are hardened below the glass transition (Tg) temperature and the material is recovered to memorized shape above the Tg temperature. The other hand, 3D printer is a machine that can directly output a 3D-designed product designed by a computer in 3D, and molded materials such as polymer, resin, metal, and ceramics. In this research, we developed the SMC of SMA wire and SMP sheet using adhesive that develops actuates into two shapes only by heating.

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Vignoli, Lucas L., Marcelo A. Savi, and Sami El-Borgi. "Nonlinear dynamics of earthquake-resistant structures using shape memory alloy composites." Journal of Intelligent Material Systems and Structures 31, no. 5 (January 13, 2020): 771–87. http://dx.doi.org/10.1177/1045389x19898269.

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Earthquake-resistant structures have been widely investigated in order to produce safe buildings designed to resist seismic activities. The remarkable properties of shape memory alloys, especially pseudoelastic effect, can be exploited in order to promote the essential energy dissipation necessary for earthquake-resistant structures. In this regard, shape memory alloy composite is an idea that can make this application feasible, using shape memory alloy fibers embedded in a matrix. This article investigates the use of shape memory alloy composites in a one-story frame structure subjected to earthquakes. Different kinds of composites are analyzed, comparing the influence of matrix type. Both linear elastic matrix and elastoplastic matrix with isotropic and kinematic hardening are investigated. Results indicate the great energy dissipation capability of shape memory alloy composites. A parametric analysis allows one to conclude that the maximum shape memory alloy volume fraction is not the optimum design condition for none of the cases studied, highlighting the necessity of a proper composite design. Despite the elastoplastic behavior of matrix also dissipates a considerable amount of energy, the associated residual strains are not desirable, showing the advantage of the use of shape memory alloys.

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Wheeler, Robert W., Othmane Benafan, Frederick T. Calkins, Xiujie Gao, Zahra Ghanbari, Garrison Hommer, Dimitris Lagoudas, et al. "Engineering design tools for shape memory alloy actuators: CASMART collaborative best practices and case studies." Journal of Intelligent Material Systems and Structures 30, no. 18-19 (September 22, 2019): 2808–30. http://dx.doi.org/10.1177/1045389x19873390.

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One of the primary goals of the Consortium for the Advancement of Shape Memory Alloy Research and Technology is to enable the design of revolutionary applications based on shape memory alloy technology. To advance this goal and reduce the development time and required experience for the fabrication of shape memory alloy actuation systems, several modeling tools were developed for common actuator types and are discussed along with case studies, which highlight their capabilities and limitations. Shape memory alloys have many potential applications as reliable, lightweight, solid-state actuators given their ability to sustain high stresses and recover large deformations. In this article, modeling frameworks are developed for three common actuator designs: wires, lightweight, low-profile, and easily implemented; coiled springs, offering actuation strokes upward of 200% at reduced mechanical loads; and torque tubes, which can provide large actuation torques in small volumes and repeatable low-load actuation. Although the design and integration of a shape memory alloy–based actuation system requires application- and environment-specific engineering considerations, common modeling tools can significantly reduce the investment required for actuation system development and provide valuable engineering insight. This analysis presents a collection of Consortium for the Advancement of Shape Memory Alloy Research and Technology collaborative best practices to allow readers to utilize the available design tools and understand their modeling principles.

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Fann, Kuang-Jau, and Pao Min Huang. "Cold Bending a Ni-Ti Shape Memory Alloy Wire." Key Engineering Materials 661 (September 2015): 98–104. http://dx.doi.org/10.4028/www.scientific.net/kem.661.98.

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Because of being in possession of shape memory effect and superelasticity, Ni-Ti shape memory alloys have earned more intense gaze on the next generation applications. Conventionally, Ni-Ti shape memory alloys are manufactured by hot forming and constraint aging, which need a capital-intensive investment. To have a cost benefit getting rid of plenty of die sets, this study is aimed to form Ni-Ti shape memory alloys at room temperature and to age them at elevated temperature without any die sets. In this study, starting with solution treatments at various temperatures, which served as annealing process, Ni-rich Ni-Ti shape memory alloy wires were bent by V-shaped punches in different curvatures at room temperature. Subsequently, the wires were aged at different temperatures to have shape memory effect. As a result, springback was found after withdrawing the bending punch and further after the aging treatment as well. A higher solution treatment temperature or a smaller bending radius leads to a smaller springback, while a higher aging treatment temperature made a larger springback. This springback may be compensated by bending the wires in further larger curvatures to keep the shape accuracy as designed. To explore the shape memory effect, a reverse bending test was performed. It shows that all bent wires after aging had a shape recovery rate above 96.3% on average.

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Chen, Zeyu. "Application of SMA materials in aerospace." Applied and Computational Engineering 25, no. 5 (November 30, 2023): 22–29. http://dx.doi.org/10.54254/2755-2721/25/ojs/20230728.

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The various characteristics of shape memory alloys, such as hyperelasticity, memory alloy effect and so on, make shape memory alloys become a new type of material with broad engineering applications. These components developed based on the characteristics of shape memory alloys are not only used in the aerospace field, but also in various fields such as bridges and railways, and can be used for various purposes such as bridge vibration control and intelligent hybrid control. This article mainly introduces several characteristics of shape memory alloys, and explains the practical application and development prospects of shape memory alloys in the aerospace field. Based on these studies, this article studies the characteristics of shape memory alloys through equation calculus and ANSYS simulation experiments modeling. It can be foreseen in the future that with the development of intelligent control technology, shape memory alloy structures will have a larger operating temperature range, more precise structural control, and will be applied in a wider variety of spacecraft structures.

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Chen, Zeyu. "Application of SMA materials in aerospace." Applied and Computational Engineering 25, no. 1 (November 7, 2023): 22–29. http://dx.doi.org/10.54254/2755-2721/25/20230728.

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The various characteristics of shape memory alloys, such as hyperelasticity, memory alloy effect and so on, make shape memory alloys become a new type of material with broad engineering applications. These components developed based on the characteristics of shape memory alloys are not only used in the aerospace field, but also in various fields such as bridges and railways, and can be used for various purposes such as bridge vibration control and intelligent hybrid control. This article mainly introduces several characteristics of shape memory alloys, and explains the practical application and development prospects of shape memory alloys in the aerospace field. Based on these studies, this article studies the characteristics of shape memory alloys through equation calculus and ANSYS simulation experiments modeling. It can be foreseen in the future that with the development of intelligent control technology, shape memory alloy structures will have a larger operating temperature range, more precise structural control, and will be applied in a wider variety of spacecraft structures.

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Jiang, S. Y., and D. Sun. "Numerical simulation of extrusion of FeMnSiCrNi/NiTiNb dissimilar shape memory alloy composite tube based on finite element method and cellular automaton." IOP Conference Series: Materials Science and Engineering 1270, no. 1 (December 1, 2022): 012043. http://dx.doi.org/10.1088/1757-899x/1270/1/012043.

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FeMnSiCrNi/NiTiNb dissimilar shape memory alloy composite tube is firstly put forward and it can be fabricated by means of isothermal extrusion. Based on Arrhenius constitutive model of FeMnSiCrNi and NiTiNb shape memory alloys, isothermal extrusion of FeMnSiCrNi/NiTiNb dissimilar shape memory alloy composite tube is simulated by rigid viscoplastic finite element method. It can be found that the deformation zone of the dissimilar shape memory alloy composite tube is always in a three-dimensional compressive stress state during extrusion, and the deformation of the inner tube is obviously higher than that of the outer tube. It is necessary to guarantee the interface compatibility between the inner tube and the outer tube during isothermal extrusion of FeMnSiCrNi/NiTiNb dissimilar shape memory alloy composite tube. The relationship between macroscopic process variables and microscopic variables during plastic deformation of FeMnSiCrNi shape memory alloy tube at high temperature is established by coupling finite element simulation and cellular automaton simulation. The microstructural evolution of FeMnSiCrNi shape memory alloy in different deformation zones during isothermal extrusion of dissimilar shape memory alloy composite tube is simulated. It can be concluded that the grain size of dynamic recrystallization is reduced with the increase of plastic strain in the deformation zone.

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Samal, Sneha, Orsolya Molnárová, Filip Průša, Jaromír Kopeček, Luděk Heller, Petr Šittner, Marcela Škodová, Lorenzo Abate, and Ignazio Blanco. "Net-Shape NiTi Shape Memory Alloy by Spark Plasma Sintering Method." Applied Sciences 11, no. 4 (February 18, 2021): 1802. http://dx.doi.org/10.3390/app11041802.

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An analysis of the shape memory effect of a NiTi alloy by using the spark plasma sintering approach has been carried out. Spark plasma sintering of Ti50Ni50 powder (20–63 µm) at a temperature of 900 °C produced specimens showing good shape memory effects. However, the sample showed 2.5% porosity due to a load of 48 MPa. Furthermore, an apparent shape memory effect was recorded and the specimens were characterized by uniformity in chemical composition and shape memory alloys of NiTi showed significant austenite phases with a bending strain recovery of >2.5%.

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Achitei, Dragos Cristian, Mohd Mustafa Al Bakri Abdullah, Andrei Victor Sandhu, Petrică Vizureanu, and Alida Abdullah. "On the Fatigue of Shape Memory Alloys." Key Engineering Materials 594-595 (December 2013): 133–39. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.133.

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When we use effectively shape memory alloys require knowledge of operational behavior at the thermal stresses and mechanical variables. Measurements performed on a CuZnAl alloy, revealed fatigue properties by considering the size of the maximum load deformation corresponding recovered memory. It requires knowledge in design fatigue behavior of shape memory alloy components after education, fatigue strength by performing partial memory loss or physical destruction. The properties of memory shape alloys recommend their use for complex mechanical applications in domains as follows medicine, robotics, aeronautics, electric contacts, actuators. Shape memory metal alloys in the construction of such installations are subject to mechanical stress, and the thermal stresses, so their inclusion in a computing system fatigue involves consideration of the function performed.

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Liu, Xing Jiang, Yan Gao, and Jin Gang Qi. "Influence of Electrical Pulse on Shape Memory Effects and Phase Transition of FeMnSiCrNi Shape Memory Alloy." Advanced Materials Research 299-300 (July 2011): 562–65. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.562.

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This paper studies the electric-pulse applied in the solidification process of the FeMnSiCrNi shape memory alloy, by applying different pulse frequency and polarity on the FeMnSiCrNi shape memory alloy to improve the shape memory effects. The results show : electric-pulse was conducive to FeMnSiCrNi alloys grain refinement, the alloy can improve the shape memory effect of Compression deformation, the absolute shape recovery rate is improved from 2% to 3.2% which is not treated by the electric-pulse ; when the liquid metal was connected with the anode of the pulse, it is easy to get the columnar grain structure and the column spacing is smaller; when the liquid metal was connected with the cathode of the pulse, the column spacing is larger; Columnar grain is conducive to FeMnSiCrNi alloy specimens compressed shape recovery, it has the smaller column spacing, yet the shape recovery rate is higher; equiaxed is favor in bending back, columnar crystals impede the bending response.

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Van Humbeeck, Jan. "High Temperature Shape Memory Alloys." Journal of Engineering Materials and Technology 121, no. 1 (January 1, 1999): 98–101. http://dx.doi.org/10.1115/1.2816006.

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Several alloy systems can be selected for high-temperature shape memory alloys, defined as alloys with stable reverse transformation temperatures above 120°C. However, due to the lack of minimum quality standards for stability, ductility, functional behavior and reliability, no successful applications have been realized so far. Research on high temperature shape memory alloys (HTSMA) is, nevertheless, an important topic not only for scientific reasons but also due to the market pull. This paper reviews existing systems of HTSMA pointing out their weak and strong parts.

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

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Shape memory alloys (SMA) provide common solid state actuators with reliable and unique characteristics. Their special behavior is based on a reversible phase transformation and can provide high power density, induced strain and block force which render them indispensable for use in morphing structures that require large shape changes while space and weight restrictions are imposed. Yet, their implementation into morphing structures faces challenges related to their complex multi-disciplinary behavior, their interaction with the passive structural components, geometrical nonlinearity due to large shape changes, the lack of experimental data, and above all, the lack of modelling tools which can robustly simulate the complex thermomechanical behavior and make feasible their design. We briefly review the material characterization process, the developed modelling tools which can simulate the complex thermomechanical response of morphing structures with SMA actuators which can undergo large shape changes under severe geometric nonlinearity, and the testing of prototype morphing components. The design and validation of two morphing structural concepts for curvature control are presented. A morphing strip capable to deform towards a single target shape is initially presented. Subsequently, a morphing airfoil concept implementing an articulated mechanism capable to achieve multiple target shapes for aerodynamic load control is presented. The challenging task to continuously adapt the structural shape to time varying demands, dictates the use of antagonistic actuator configurations to maximize and control the range of morphing. The previously mentioned morphing airfoil configuration is used to alleviate the aerodynamic fatigue loads in wind turbine blades and aircraft wings.

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Birman, Victor. "Review of Mechanics of Shape Memory Alloy Structures." Applied Mechanics Reviews 50, no. 11 (November 1, 1997): 629–45. http://dx.doi.org/10.1115/1.3101674.

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This article presents a review of constitutive theories, mechanics, and structural applications of shape memory alloys. Although these materials possess a number of unique features, this review is concerned with the shape memory effect and superelasticity, since they are most often discussed in the context of possible applications. The article begins with a discussion of these effects and a reference to a number of studies elucidating the properties of shape memory alloys. In the next section, a number of constitutive theories are listed and some recent theories are discussed in detail. The work related to numerous technological problems that arise in the process of manufacturing shape memory alloy structures is considered. Structural problems of shape memory structures, such as buckling, vibration, acoustic control, etc are discussed. The work related to development and design of shape memory sensors and actuators is also reviewed. Finally, some applications of shape memory alloy actuators, particularly those in the aerospace and medical fields, are considered. This review article contains 195 references.

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Jähne, R., and L. F. Campanile. "Shape-memory coaxial bimorphs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 11 (August 25, 2009): 2713–16. http://dx.doi.org/10.1243/09544062jmes1779.

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The thermal shape recovery shown by shape memory alloys is a property that makes these materials very attractive for applications in the field of smart structures, e.g. bending actuators. This article shows a design method for coaxial bimorphs that are composed of a linear-elastic and shape memory alloy component, properly coupled. A simple and effective method is proposed to solve for the component designs in order to achieve given bimorph configurations. Analytical examples and finite-element simulations are shown for the case of assigned bimorph's warm shape.

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Niu, Haojie, Yubin Sun, and Chengxin Lin. "Study on the Effect of Solid Solution Treatment on the Bending Fatigue Property of Fe-Mn-Si Shape Memory Alloys." Metals 14, no. 4 (April 10, 2024): 441. http://dx.doi.org/10.3390/met14040441.

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Fe-Mn-Si shape memory alloys have excellent low-cycle fatigue performance and broad application prospects in the field of civil engineering and construction. It is necessary to conduct comprehensive and in-depth research on the mechanical properties of Fe-Mn-Si shape memory alloys. This study takes the Fe17Mn5Si10Cr5Ni shape memory alloy as the research object. After solid solution treatment at different temperatures and times, the effect of solid solution treatment on the bending fatigue performance of Fe-Mn-Si shape memory alloys was studied using bending cycle tests. The phase composition and fracture morphology of the sample were analyzed. The results showed that solid solution treatment can significantly improve the bending fatigue performance of Fe-Mn-Si shape memory alloys, reaching the optimal value at 850 °C for 1 h. The number of bending cycles until fracture increased by 131% compared to untreated specimens. Stress induction γ → ε martensitic transformation occurred in Fe-Mn-Si shape memory alloy specimens during bending cyclic testing, which is reversible. The fracture area of Fe-Mn-Si shape memory alloy specimens is mainly characterized by ductile fracture, with some areas exhibiting quasi-quasi-cleavage fracture characteristics.

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Mohammadi Nia, Majid, and Saber Moradi. "Limit state behavior and response sensitivity analysis of endplate steel connections with shape memory alloy bolts." Journal of Intelligent Material Systems and Structures 31, no. 18 (July 21, 2020): 2071–87. http://dx.doi.org/10.1177/1045389x20942584.

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Shape memory alloys have been used in developing self-centering steel moment connections. This article presents a numerical study aiming at evaluating the cyclic response sensitivity and limit states of extended endplate steel connections with shape memory alloy bolts. Three-dimensional finite element models are developed and validated against a recent experimental study. Using a statistical design-of-experiment method, the effects of 21 design factors and their interactions on the cyclic response of shape memory alloy connections are assessed. The sensitivity of six response parameters is studied. In addition, four limit states for shape memory alloy connections are discussed, including beam local buckling, bolt excessive axial strain, endplate yielding, and column flange yielding. Results show that endplate thickness, shape memory alloy bolt diameter, beam web slenderness ratio, and shape memory alloy maximum transformation strain are the most influential factors. Furthermore, endplate yielding is found to be the governing limit state in almost 80% of the analyzed connections, whereas shape memory alloy bolt excessive strain and column flange yielding are observed in less than 20% and 5% of the connections, respectively. Beam local buckling is not governing in the analyzed shape memory alloy connections designed as per the AISC 358-16 and AISC 341-16 seismic design requirements for extended endplate connections and highly ductile members.

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Qu, Wentao, and Sizhu Huang. "Thermal Cycling Stability of Ti-Zr-Nb-Al Shape Memory Alloy." Academic Journal of Science and Technology 11, no. 1 (May 10, 2024): 7–12. http://dx.doi.org/10.54097/xacj0x65.

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Shape memory alloys, as a novel class of intelligent materials, possess substantial application potential in the field of petroleum engineering at elevated temperatures. However, the complex downhole environment necessitates the alloy to endure alternating cycles of cold and heat, demanding both a high phase transformation temperature and excellent thermal cycling stability. This study focuses on a quaternary Ti-Zr-Nb-Al shape memory alloy, examining the thermal cycling stability of the Ti-20Zr-10Nb-xAl (x=1, 2, 3, 4 at%) alloys after subjecting them to 50 thermal cycles. Results indicate that the alloy composition, post 50 cycles, transitions from a single martensite α'' -phase to a duplex microstructure comprising α''-phase and β-phase. Changes in Al content did not significantly affect the phase composition of the alloy in its thermally cycled state. As Al content increases, both the tensile strength and shape memory effect of the alloy initially improve before declining. In terms of shape memory properties, the Ti-20Zr-10Nb-2Al alloy sample exhibits the most favorable thermal cycling stability, characterized by a tensile strength of 692 MPa, an elongation of 6%, a shape memory effect of 0.96% under 4% pre-strain, a shape memory recovery rate of 38%, and a Vickers microhardness of 381 HV.

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Liu, Bingfei, Qingfei Wang, Shilong Hu, Wei Zhang, and Chunzhi Du. "On thermomechanical behaviors of the functional graded shape memory alloy composite for jet engine chevron." Journal of Intelligent Material Systems and Structures 29, no. 14 (June 13, 2018): 2986–3005. http://dx.doi.org/10.1177/1045389x18781257.

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This study presents a theoretical work for a novel adaptive jet engine chevron concept based upon embedding the functionally graded shape memory alloy actuators in a composite laminate, termed a functionally graded shape memory alloy actuator composite. The constitutive models of the functionally graded shape memory alloy actuator composites including the monolayer shape memory alloy composites and multilayer shape memory alloy composites with different volume fractions of the shape memory alloy were first given. An example using such models was discussed on a published finite element work on a shape memory alloy hybrid composite jet engine chevron concept to prove the validity of the theoretical work. The thermomechanical behaviors of the functionally graded shape memory alloy actuator composite with different volume fractions of the shape memory alloy subjected to the thermal loading were then discussed using the obtained constitutive model. The tip deflections of the jet engine chevron with different embedding patterns of the shape memory alloy were finally obtained.

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LotfiNeyestanak, Ali Akbar, and Saeed Daneshmand. "The Effect of Operational Cutting Parameters on Nitinol-60 in Wire Electrodischarge Machining." Advances in Materials Science and Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/457186.

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Shape memory alloys are a kind of active materials, which have significant characteristics in comparison with other alloys. Since these materials are applicable in different fields such as aerospace, automobile industry, medicine, and dentistry, the effects of wire electrodischarge machining on the properties of these alloys have been studied. In this paper, changes in the shape recovery ability and microhardness of the machined surface of Nitonol-60 shape memory alloy have been studied considering recasting and formation of resolidificated layer on the shape memory alloy surface. XRD and EDXA analyses of the surface layer of the sample besides a microscopic study of the shape memory alloy layer by SEM and a study of the changes in mechanical properties of the surface layer were done by performing microhardness and tension tests on the work piece surface. Considering the surface layer, reversible strain has been studied according to the shape recovery percentage of Nitinol-60 shape memory alloy. Results show that the surface layer formed on the surface of the samples has caused changes in both physical and mechanical properties of the cut surface because of the penetration of the separated materials in comparison with deeper layers of the piece.

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Journal articles on the topic 'Shape Memory Alloy'

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