Academic literature on the topic 'Porous Shape Memory Alloys'

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Journal articles on the topic "Porous Shape Memory Alloys"

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Panico, M., and L. C. Brinson. "Computational modeling of porous shape memory alloys." International Journal of Solids and Structures 45, no. 21 (October 2008): 5613–26. http://dx.doi.org/10.1016/j.ijsolstr.2008.06.005.

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Tuissi, Ausonio, Paola Bassani, and Carlo Alberto Biffi. "CuZnAl Shape Memory Alloys Foams." Advances in Science and Technology 78 (September 2012): 31–39. http://dx.doi.org/10.4028/www.scientific.net/ast.78.31.

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Foams and other highly porous metallic materials with cellular structures are known to have many interesting combinations of physical and mechanical properties. That makes these systems very attractive for both structural and functional applications. Cellular metals can be produced by several methods including liquid infiltration of leachable space holders. In this contribution, results on metal foams of Cu based shape memory alloys (SMAs) processed by molten metal infiltration of SiO2 particles are presented. By using this route, highly homogeneous CuZnAl SMA foams with a spherical open-cell morphologies have been manufactured and tested. Morphological, thermo-mechanical and cycling results are reported.
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Liu, Bing Fei, Guan Suo Dui, and Yu Ping Zhu. "A Micromechanical Constitutive Model for Porous Shape Memory Alloys." Applied Mechanics and Materials 29-32 (August 2010): 1855–61. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1855.

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A micromechanical constitutive model for responding the macroscopic behavior of porous shape memory alloys (SMA) has been proposed in this work. According to the micromechanical method, the stiffness tensor of the porous SMA is obtained. The critical stresses are calculated by elastic mechanics. Based on the general concept of secant moduli method, the effective secant moduli of the porous SMA is given in terms of the secant moduli of dense SMA and the volume fraction of pores. The model takes account of the tensile-compressive asymmetry of SMA materials and the effect of the hydrostatic stress. Only the material parameters of dense SMA are needed for numerical calculation, and can degenerate to dense material. Examples for the uniaxial response of porous SMA materials at constant temperature are then used to illustrate one possible application of the constitutive model. The numerical results have been compared with the experiment data for porous SMA, which show that the modeling results are in good agreement with the experiments.
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Yuan, Bin, Min Zhu, and Chi Yuen Chung. "Biomedical Porous Shape Memory Alloys for Hard-Tissue Replacement Materials." Materials 11, no. 9 (September 13, 2018): 1716. http://dx.doi.org/10.3390/ma11091716.

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Porous shape memory alloys (SMAs), including NiTi and Ni-free Ti-based alloys, are unusual materials for hard-tissue replacements because of their unique superelasticity (SE), good biocompatibility, and low elastic modulus. However, the Ni ion releasing for porous NiTi SMAs in physiological conditions and relatively low SE for porous Ni-free SMAs have delayed their clinic applications as implantable materials. The present article reviews recent research progresses on porous NiTi and Ni-free SMAs for hard-tissue replacements, focusing on two specific topics: (i) synthesis of porous SMAs with optimal porous structure, microstructure, mechanical, and biological properties; and, (ii) surface modifications that are designed to create bio-inert or bio-active surfaces with low Ni releasing and high biocompatibility for porous NiTi SMAs. With the advances of preparation technique, the porous SMAs can be tailored to satisfied porous structure with porosity ranging from 30% to 85% and different pore sizes. In addition, they can exhibit an elastic modulus of 0.4–15 GPa and SE of more than 2.5%, as well as good cell and tissue biocompatibility. As a result, porous SMAs had already been used in maxillofacial repairing, teeth root replacement, and cervical and lumbar vertebral implantation. Based on current research progresses, possible future directions are discussed for “property-pore structure” relationship and surface modification investigations, which could lead to optimized porous biomedical SMAs. We believe that porous SMAs with optimal porous structure and a bioactive surface layer are the most competitive candidate for short-term and long-term hard-tissue replacement materials.
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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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Entchev, Pavlin B., and Dimitris C. Lagoudas. "Modeling porous shape memory alloys using micromechanical averaging techniques." Mechanics of Materials 34, no. 1 (January 2002): 1–24. http://dx.doi.org/10.1016/s0167-6636(01)00088-6.

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Abdollahzadeh, Masumeh, Seyed Hamed Hoseini, and Shirko Faroughi. "Modeling of superelastic behavior of porous shape memory alloys." International Journal of Mechanics and Materials in Design 16, no. 1 (May 11, 2019): 109–21. http://dx.doi.org/10.1007/s10999-019-09457-x.

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Liu, Bingfei, Guansuo Dui, and Yuping Zhu. "On phase transformation behavior of porous Shape Memory Alloys." Journal of the Mechanical Behavior of Biomedical Materials 5, no. 1 (January 2012): 9–15. http://dx.doi.org/10.1016/j.jmbbm.2011.09.015.

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Kaya, Mehmet, and Ömer Çakmak. "Shape Memory Behavior of Porous NiTi Alloy." Metallurgical and Materials Transactions A 47, no. 4 (January 19, 2016): 1499–503. http://dx.doi.org/10.1007/s11661-015-3318-1.

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Biesiekierski, Arne, James Wang, and Cui'e Wen. "A Brief Review of Biomedical Shape Memory Alloys by Powder Metallurgy." Key Engineering Materials 520 (August 2012): 195–200. http://dx.doi.org/10.4028/www.scientific.net/kem.520.195.

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In the realm of bioimplantation, titanium-based Shape Memory Alloys (SMAs) exhibit phenomenal versatility, with successful application in diverse fields. One area of particular interest is that of orthopaedics, where the unique properties of SMAs offer a range of benefits. That said, existing alloys still have unresolved issues concerning biocompatibility and osseointegration. Primary concerns include carcinogenicity, allergenicity and a significant mismatch between the Young’s moduli of bone and osteoimplants; issues that could be addressed via a novel porous titanium alloy. With that in mind, this paper seeks to provide a review identifying promising candidates for new, perfectly biocompatible alloys for production via powder metallurgy. Furthermore, an attempt will also be made to summarise existing research into appropriate methods for the production of a porous Ti-based SMA implant.
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Dissertations / Theses on the topic "Porous Shape Memory Alloys"

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Penrod, Luke Edward. "Fabrication and characterization of porous shape memory alloys." Texas A&M University, 2003. http://hdl.handle.net/1969.1/145.

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This work details an investigation into the production of porous shape memory alloys (SMAs) via hot isostatic press (HIP) from prealloyed powders. HIPing is one of three main methods for producing porous SMAs, the other two are conventional sintering and selfpropagating hightemperature synthesis (SHS). Conventional sintering is characterized by its long processing time at near atmospheric pressure and samples made this way are limited in porosity range. The SHS method consists of preloading a chamber with elemental powders and then initiating an explosion at one end, which then propagates through the material in a very short time. HIPing provides a compromise between the two methods, requiring approximately 5 hours per cycle while operating in a very controlled environment. The HIPing method gives fine control of both temperature and pressure during the run which allows for the production of samples with varying porosity as well as for finetuning of the process for other characteristics. By starting with prealloyed powder, this study seeks to avoid the drawbacks while retaining the benefits of HIPing with elemental powders. In an extension of previous work with elemental powders, this study will apply the HIP method to a compact of prealloyed powders. It is hoped that the use of these powders will limit the formation of alternate phases as well as reducing oxidation formed during preparation. In addition, the nearspherical shape of the powders will encourage an even pore distribution. Processing techniques will be presented as well as a detailed investigation of the thermal and mechanical properties of the resulting material.
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Aydogmus, Tarik. "Processing And Characterization Of Porous Titanium Nickel Shape Memory Alloys." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612232/index.pdf.

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Porous TiNi alloys (Ti-50.4 at. %Ni and Ti-50.6 at. %Ni) with porosities in the range 21%-81% were prepared successfully applying a new powder metallurgy fabrication route in which magnesium was used as space holder resulting in either single austenite phase or a mixture of austenite and martensite phases dictated by the composition of the starting prealloyed powders but entirely free from secondary brittle intermetallics, oxides, nitrides and carbonitrides. Magnesium vapor do not only prevents secondary phase formation and contamination but also provides higher temperature sintering opportunity preventing liquid phase formation at the eutectic temperature, 1118 °
C resulting from Ni enrichment due to oxidation. By two step sintering processing (holding the sample at 1100 °
C for 30 minutes and subsequently sintering at temperatures higher than the eutectic temperature, 1118 °
C) magnesium may allow sintering probably up to the melting point of TiNi. The processed alloys exhibited interconnected (partially or completely depending on porosity content) open macro-pores spherical in shape and irregular micro-pores in the cell walls resulting from incomplete sintering. It has been found that porosity content of the foams have no influence on the phase transformation temperatures while deformation and oxidation are severely influential. Porous TiNi alloys displayed excellent superelasticity and shape memory behavior. Space holder technique seems to be a promising method for production of porous TiNi alloys. Desired porosity level, pore shape and accordingly mechanical properties were found to be easily adjustable.
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Chan, Wing Nin. "Comparison of the wearing of porous and dense NiTi shape memory alloy." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21458406a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2006.
"Master of Science in Materials Engineering & Nanotechnology dissertation." Title from title screen (viewed on Nov. 23, 2006) Includes bibliographical references.
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Zhao, Ying. "Design of energy absorbing materials and composite structures based on porous shape memory alloys (SE) /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/7148.

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Popov, Petar Angelov. "Constitutive modelling of shape memory alloys and upscaling of deformable porous media." Texas A&M University, 2003. http://hdl.handle.net/1969.1/2273.

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Shape Memory Alloys (SMAs) are metal alloys which are capable of changing their crystallographic structure as a result of externally applied mechanical or thermal loading. This work is a systematic effort to develop a robust, thermodynamics based, 3-D constitutive model for SMAs with special features, dictated by new experimental observations. The new rate independent model accounts in a unified manner for the stress/thermally induced austenite to oriented martensite phase transformation, the thermally induced austenite to self-accommodated martensite phase transformation as well as the reorientation of self-accommodated martensite under applied stress. The model is implemented numerically in 3-D with the help of return-mapping algorithms. Numerical examples, demonstrating the capabilities of the model are also presented. Further, the stationary Fluid-Structure Interaction (FSI) problem is formulated in terms of incompressible Newtonian fluid and a deformable solid. A numerical method is presented for its solution and a numerical implementation is developed. It is used to verify an existing asymptotic solution to the FSI problem in a simple channel geometry. The SMA model is also used in conjunction with the fluid-structure solver to simulate the behavior of SMA based filtering and flow regulating devices. The work also includes a numerical study of wave propagation in SMA rods. An SMA body subjected to external dynamic loading will experience large inelastic deformations that will propagate through the body as phase transformation and/or detwinning shock waves. The wave propagation problem in a cylindrical SMA is studied numerically by an adaptive Finite Element Method. The energy dissipation capabilities of SMA rods are estimated based on the numerical simulations. Comparisons with experimental data are also performed.
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Kwan, Wai Ming. "Wear resistance of porous titanium-nickel shape memory alloy fabricated by reactive sintering with HIPping." access abstract and table of contents access full-text, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21174155a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2005.
At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Aug. 31, 2006) Includes bibliographical references.
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Chan, Benny See Tsun. "Corrosion behavior of porous NiTi shape memory alloy prepared by capsule free hot isolated pressing processing." access abstract and table of contents access full-text, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21174003a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2005.
At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Aug. 31, 2006) Includes bibliographical references.
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Saedi, Soheil. "Shape Memory Behavior of Dense and Porous NiTi Alloys Fabricated by Selective Laser Melting." UKnowledge, 2017. http://uknowledge.uky.edu/me_etds/90.

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Selective Laser Melting (SLM) of Additive Manufacturing is an attractive fabrication method that employs CAD data to selectively melt the metal powder layer by layer via a laser beam and produce a 3D part. This method not only opens a new window in overcoming traditional NiTi fabrication problems but also for producing porous or complex shaped structures. The combination of SLM fabrication advantages with the unique properties of NiTi alloys, such as shape memory effect, superelasticity, high ductility, work output, corrosion, biocompatibility, etc. makes SLM NiTi alloys extremely promising for numerous applications. The SLM process parameters such as laser power, scanning speed, spacing, and strategy used during the fabrication are determinant factors in composition, microstructural features and functional properties of the SLM NiTi alloy. Therefore, a comprehensive and systematic study has been conducted over Ni50.8 Ti49.2 (at%) alloy to understand the influence of each parameter individually. It was found that a sharp [001] texture is formed as a result of SLM fabrication which leads to improvements in the superelastic response of the alloy. It was perceived that transformation temperatures, microstructure, hardness, the intensity of formed texture and the correlated thermo-mechanical response are changed substantially with alteration of each parameter. The provided knowledge will allow choosing optimized parameters for tailoring the functional features of SLM fabricated NiTi alloys. Without going through any heat treatments, 5.77% superelasticity with more than 95% recovery ratio was obtained in as-fabricated condition only with the selection of right process parameters. Additionally, thermal treatments can be utilized to form precipitates in Ni-rich SLM NiTi alloys fabricated by low energy density. Precipitation could significantly alter the matrix composition, transformation temperatures and strain, critical stress for transformation, and shape memory response of the alloy. Therefore, a systematic aging study has been performed to reveal the effects of aging time and temperature. It was found that although SLM fabricated samples show lower strength than the initial ingot, heat treatments can be employed to make significant improvements in shape memory response of SLM NiTi. Up to 5.5% superelastic response and perfect shape memory effect at stress levels up to 500 MPa was observed in solutionized Ni-rich SLM NiTi after 18h aging at 350ºC. For practical application, transformation temperatures were even adjusted without solution annealing and superelastic response of 5.5% was achieved at room temperature for 600C-1.5hr aged Ni-rich SLM NiTi. The effect of porosity on strength and cyclic response of porous SLM Ni50.1 Ti49.9 (at%) were investigated for potential bone implant applications. It is shown that mechanical properties of samples such as elastic modulus, yield strength, and ductility of samples are highly porosity level and pore structure dependent. It is shown that it is feasible to decrease Young’s modulus of the SLM NiTi up to 86% by adding porosity to reduce the mismatch with that of a bone and still retain the shape memory response of SLM fabricated NiTi. The shape memory effect, as well as superelastic response of porous SLM Ni50.8Ti49.2,were also investigated at body temperature. 32 and 45% porous samples with similar behaviors, recovered 3.5% of 4% deformation at first cycle. The stabilized superelastic response was obtained after clicking experiments.
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Caputo, Matthew P. "4-Dimensional Printing and Characterization of Net-Shaped Porous Parts Made from Magnetic Ni-Mn-Ga Shape Memory Alloy Powders." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1525436335401265.

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Myers, Eric J. "Finite Element Modeling (FEM) of Porous Additively Manufactured Ferromagnetic Shape Memory Alloy Using Scanning Electron Micrograph (SEM) Based Geometries." Youngstown State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ysu149399154152881.

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Books on the topic "Porous Shape Memory Alloys"

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Fremond, M., and S. Miyazaki. Shape Memory Alloys. Vienna: Springer Vienna, 1996. http://dx.doi.org/10.1007/978-3-7091-4348-3.

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Lexcellent, Christian. Shape-memory Alloys Handbook. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118577776.

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Kohl, M. Shape memory microactuators. Berlin: Springer, 2004.

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Miyazaki, Shuichi, Yong Qing Fu, and Wei Min Huang, eds. Thin Film Shape Memory Alloys. Cambridge: Cambridge University Press, 2009. http://dx.doi.org/10.1017/cbo9780511635366.

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Kohl, Manfred. Shape Memory Microactuators. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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Yoneyama, Takayuki, and Shuichi Miyazaki. Shape memory alloys for biomedical applications. Cambridge, England: Woodhead Pub., 2009.

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Fang, Cheng, and Wei Wang. Shape Memory Alloys for Seismic Resilience. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-7040-3.

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Lagoudas, Dimitris C. Shape Memory Alloys: Modeling and Engineering Applications. Boston, MA: Springer-Verlag US, 2008.

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Frémond, M. Shape memory alloys / M. Fremond, S. Miyazaki. Wien: Springer, 1996.

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Kastner, Oliver. First Principles Modelling of Shape Memory Alloys. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28619-3.

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Book chapters on the topic "Porous Shape Memory Alloys"

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Tao, Yi Yi, Jiu Hua Xu, and Wen Feng Ding. "A Study on Grinding Performance of Porous NiTi Shape Memory Alloy." In Advances in Grinding and Abrasive Technology XIV, 143–47. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-459-6.143.

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Cao, Shanshan, Yuan-Yuan Li, Cai-You Zeng, and Xin-Ping Zhang. "Porous Ni–Ti–Nb Shape Memory Alloys with Tunable Damping Performance Controlled by Martensitic Transformation." In Proceedings of the International Conference on Martensitic Transformations: Chicago, 275–79. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76968-4_43.

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Zhu, Shijie, Céline Bouby, Abel Cherouat, and Tarak Ben Zineb. "Porous Shape Memory Alloy: 3D Reconstitution and Numerical Simulation of Superelastic Behavior." In Design and Modeling of Mechanical Systems—III, 371–81. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66697-6_37.

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Xiong, Jian Yu, Yun Cang Li, Yasuo Yamada, Peter Hodgson, and Cui'e Wen. "Processing and Mechanical Properties of Porous Titanium-Niobium Shape Memory Alloy for Biomedical Applications." In Materials Science Forum, 1689–92. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.1689.

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Sahu, A., I. A. Palani, Sachin Bhirodkar, C. P. Paul, and K. S. Bindra. "Investigations on Synthesis of Porous NiTi Shape Memory Alloy Structures Using Selective Laser Melting Techniques." In Lecture Notes on Multidisciplinary Industrial Engineering, 329–36. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9433-2_29.

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Jiang, Hai Chang, and Li Jian Rong. "Microstructures and Mechanical Properties of Porous Ti51Ni(49-x)Mox Shape Memory Alloys." In Materials Science Forum, 2127–32. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.2127.

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Frémond, Michel. "Shape Memory Alloys." In Non-Smooth Thermomechanics, 359–400. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04800-9_13.

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Hornbogen, E. "Shape Memory Alloys." In Advanced Structural and Functional Materials, 133–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-49261-7_5.

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Frémond, Michel. "Shape Memory Alloys." In Lecture Notes of the Unione Matematica Italiana, 67–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24609-8_5.

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Savi, Marcelo A., Alberto Paiva, Carlos J. de Araujo, and Aline S. de Paula. "Shape Memory Alloys." In Dynamics of Smart Systems and Structures, 155–88. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29982-2_8.

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Conference papers on the topic "Porous Shape Memory Alloys"

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"Production of Biocompatible TiNi-based Porous Materials with Terraced Surface of Pore Walls." In Shape Memory Alloys 2018. Materials Research Forum LLC, 2018. http://dx.doi.org/10.21741/9781644900017-2.

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Lagoudas, Dimitris C., Pavlin B. Entchev, and Eric L. Vandygriff. "Fabrication, modeling, and characterization of porous shape memory alloys." In SPIE's 8th Annual International Symposium on Smart Structures and Materials, edited by Christopher S. Lynch. SPIE, 2001. http://dx.doi.org/10.1117/12.432750.

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Lagoudas, Dimitris C., Pavlin B. Entchev, Eric L. Vandygriff, Muhammad A. Qidwai, and Virginia G. DeGiorgi. "Modeling of thermomechanical response of porous shape memory alloys." In SPIE's 7th Annual International Symposium on Smart Structures and Materials, edited by Christopher S. Lynch. SPIE, 2000. http://dx.doi.org/10.1117/12.388233.

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DeGiorgi, V., and M. Qidwai. "A computational evaluation of material characteristics of porous shape memory alloys." In 19th AIAA Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-1353.

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Bormann, Therese, Sebastian Friess, Michael de Wild, Ralf Schumacher, Georg Schulz, and Bert Müller. "Determination of strain fields in porous shape memory alloys using micro-computed tomography." In SPIE Optical Engineering + Applications, edited by Stuart R. Stock. SPIE, 2010. http://dx.doi.org/10.1117/12.861386.

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Man, H. C., and S. Zhang. "Laser fabricated porous coating on niti shape memory alloy." In ICALEO® 2005: 24th International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2005. http://dx.doi.org/10.2351/1.5060556.

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Zaki, Wael, and N. V. Viet. "A Phenomenological Model for Shape Memory Alloys With Uniformly Distributed Porosity." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2396.

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Abstract A phenomenological model is proposed for shape memory alloys considering the presence of uniformly distributed voids. The model is developed within a modified generalized standard materials framework, which considers the presence of constraints on the state variables and ensures thermodynamic consistency. Within this framework, a free energy density is first proposed for the porous material, wherein the influence of porosity is accounted for by means of scalar state variables accounting for damage and inelastic dilatation. By choosing key thermodynamic forces, derived from the expression of the energy, as sub-gradients of a pseud-potential of dissipation, loading functions are derived that govern phase transformation and martensite detwinning. Flow rules are also proposed for damage and inelastic dilatation in a way that ensures positive dissipation. The model is discretized and the integration of the time-discrete formulation is carried out using an implicit formulation, whereby a return mapping algorithm is implemented to calculate increments of dissipative variables including inelastic strains. Comparison with data from the literature is finally presented.
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Stebner, Aaron, Joseph Krueger, Anselm J. Neurohr, David C. Dunand, L. Catherine Brinson, James H. Mabe, and Frederick T. Calkins. "Light-Weight, Fast-Cycling, Shape-Memory Actuation Structures." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4988.

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While bulk shape memory alloys (SMAs) have proven a successful means for creating adaptive aerospace structures in many demonstrations, including live flight tests, the time required to cool such actuators has been identified as a property that could inhibit their commercial implementation in some circumstances. To determine best practices for improving cooling times, several approaches to increase the surface area and reduce the mass of existing bulk actuator technologies have been examined. Specifically, geometries created using traditional milling and EDM techniques were compared with micro-channel geometries made possible by a new electrochemical milling process developed at Northwestern. The latter technique involves imbedding steel space-holders in a matrix of NiTi powders, hot isostatic pressing the preform into a dense composite, and then electro-chemically dissolving the steel. Thus, in a two-step process, it is possible to create an actuation structure with numerous micro-channels with excellent control of geometry, shape, size and placement, to reduce weight and increase surface area (and thus decrease response time) without compromising actuator performance. In this paper, the new, lighter-weight, faster cycling shape-memory alloy actuation structures resulting from each technique are reviewed. Their performances are compared and contrasted through the results of a numerical study conducted with a 3D SMA constitutive law developed specifically to handle the complex, non-proportional loadings that arise in porous structures. It is shown that using micro-channel technology, cooling times are significantly reduced relative to traditional machining techniques for the same amount of mass reduction.
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Ho, Joan P. Y., S. L. Wu, Ray W. Y. Poon, X. Y. Liu, C. Y. Chung, Paul K. Chu, Kelvin W. K. Yeung, William W. Lu, and Kenneth M. C. Cheung. "Suppression of Nickel Out-Diffusion from Porous Nickel-Titanium Shape Memory Alloy by Plasma Immersion Ion Implantation." In IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science. IEEE, 2005. http://dx.doi.org/10.1109/plasma.2005.359457.

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Zhang, Jingxian, Ruifeng Guan, and Xin-Ping Zhang. "Notice of Retraction: TiO2 Anatase Coatings on Porous NiTi Shape Memory Alloy Prepared by a Dipping Sol-Gel Method." In 2011 5th International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2011. http://dx.doi.org/10.1109/icbbe.2011.5780703.

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Reports on the topic "Porous Shape Memory Alloys"

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Lagoudas, Dimitris C. Dynamic Behavior and Shock Absorption Properties of Porous Shape Memory Alloys. Fort Belvoir, VA: Defense Technical Information Center, July 2002. http://dx.doi.org/10.21236/ada403775.

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Entchev, Pavlin B., Dimitris C. Lagoudas, Muhammad A. Qidwai, and Virginia G. DeGiorgi. Porous Shape Memory Alloys. Part 2. Modeling of the Thermomechanical Response. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada403941.

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Brinson, L. C. Novel Processing for Creating 3D Architectured Porous Shape Memory Alloy. Fort Belvoir, VA: Defense Technical Information Center, March 2013. http://dx.doi.org/10.21236/ada586593.

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Douglas, Craig C. Dynamic-Data Driven Modeling of Uncertainties and 3D Effects of Porous Shape Memory Alloys. Fort Belvoir, VA: Defense Technical Information Center, February 2014. http://dx.doi.org/10.21236/ada597368.

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Crone, Wendy C., Arhur B. Ellis, and John H. Perepezko. Nanostructured Shape Memory Alloys: Composite Materials with Shape Memory Alloy Constituents. Fort Belvoir, VA: Defense Technical Information Center, March 2004. http://dx.doi.org/10.21236/ada423479.

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Wendy Crone, Walter Drugan, Arthur Ellis, and John Perepezko. Final Technical Report: Nanostructured Shape Memory ALloys. Office of Scientific and Technical Information (OSTI), July 2005. http://dx.doi.org/10.2172/841686.

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Daly, Samantha Hayes. Deformation and Failure Mechanisms of Shape Memory Alloys. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1179294.

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Karaman, Ibrahim, and Dimitris C. Lagoudas. Magnetic Shape Memory Alloys with High Actuation Forces. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada447252.

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McLaughlin, Jarred T., Thomas Edward Buchheit, and Jordan Elias Massad. Characterization of shape memory alloys for safety mechanisms. Office of Scientific and Technical Information (OSTI), March 2008. http://dx.doi.org/10.2172/943852.

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Crone, Wendy C., Arthur B. Ellis, and John H. Perepezko. Nanostructured Shape Memory Alloys: Adaptive Composite Materials and Components. Fort Belvoir, VA: Defense Technical Information Center, December 2007. http://dx.doi.org/10.21236/ada475505.

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