Shape Memory Effect
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Transition temperature range of thermally activated nickel-titanium archwires
Objectives: The shape memory resulting from the superelasticity and thermoelastic effect is the main characteristic of thermally activated NiTi archwires and is closely related to the transition temperature range (TTR). The aim of this study was to evaluate the TTR of thermally activated NiTi archwires commercially available. Material and Methods: Seve
J. Appl. Oral Sci.. Publicado em: 2014-04
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14. Analysis of the transformations temperatures of helicoidal Ti-Ni actuators using computational numerical methods
The development of shape memory actuators has enabled noteworthy applications in the mechanical engineering, robotics, aerospace, and oil industries and in medicine. These applications have been targeted on miniaturization and taking full advantage of spaces. This article analyses a Ti-Ni shape memory actuator used as part of a flow control system. A Ti-Ni s
Mat. Res.. Publicado em: 10/05/2013
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15. Estudo das propriedades termomecânicas da liga cu 78,3% - al 9,8% mn 11,9% / STUDY OF THE THERMOMECHANICAL PROPERTIES OF THE ALLOY Cu78,3% - Al9,8% - Mn11,9%
The alloys Cu 78,3% - Al 9,8% - Mn 11,9 and 77.5% Cu - Al 9.8% - Mn 11,9% -% Nb 0.5 - 0.3% Ni (wt%) were prepared without the use of protective atmosphere. The first alloy was characterized using optical microscopy, scanning electron microscopy, differential scanning calorimetry and X-ray diffraction and its mechanical property was determinated by the tensil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/03/2012
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16. Nickel-titanium alloys: a systematic review
OBJECTIVE: A systematic review on nickel-titanium wires was performed. The strategy was focused on Entrez-PubMed-OLDMEDLINE, Scopus and BioMed Central from 1963 to 2008. METHODS: Papers in English and French describing the behavior of these wires and laboratorial methods to identify crystalline transformation were considered. A total of 29 papers were select
Dental Press Journal of Orthodontics. Publicado em: 2012-06
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17. Nanoparticles from Cu-Zn-Al shape memory alloys physically synthesized by ion milling deposition
In this research, an ion milling equipment was used to elaborate nanoparticles from Cu-Zn-Al alloys with shape memory effect. Two different compositions were used, target A: 75.22Cu-17.12Zn-7.66Al at % with an Ms of -9 °C and target B: 76.18Cu-15.84Zn-7.98Al with an Ms of 20 °C. Nanoparticles were characterized by High Resolution Transmission Electron Micr
Materials Research. Publicado em: 05/04/2012
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18. Efeito da adição de cromo sobre a microestrutura e propriedades termomecânicas em ligas cu-al-be com efeito memória de forma / Effect of addition of chromium on the microstructure and properties in thermomechanical alloy cu-al-be with shape memory effect
Neste trabalho foi realizado um estudo experimental sobre a influência do cromo na microestrutura e propriedades termomecânicas em ligas Cu-Al-Be com efeito memória de forma. As composições químicas destas ligas são Cu-11,8Al-0,6Be-XCr; X = 0,1; 0,2, 0,3, 0,5 e 0,05 (% em peso). As amostras foram submetidas à análise por microscopia óptica para det
Publicado em: 2010
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19. Grain size effect on the structural parameters of the stress induced epsilonhcp: martensite in iron-based shape memory alloy
The aim of this work was to study the effect of austenitic grain size (GS) reduction on the structural parameters of the epsilonhcp - martensite in stainless shape memory alloy (SMA). Rietveld refinement data showed an expansion in c-axis and a reduction in a and b-axis with thermo-mechanical cycles for all samples analyzed. Samples with 75 < GS (µm) < 129
Materials Research. Publicado em: 2008-03
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20. Martensita induzida por deformação a temperatura ambiente na liga de 3,5Ni 1V 13,8Al Cu com efeito, memória de forma / MARTENSITE INDUCED BY DEFORMATION AT ROOM TEMPERATURE IN THE ALLOY OF 3,5Ni-1V-13,8Al-Cu WITH SHAPE MEMORY EFFECT
The presented work consists of a study for observation of the martensite kept in the transformation of martensite phase - austenite in a alloy of Ni - Al - V, with memory shape effect, into, a room temperature. We defined that the alloy with composition the 3,5% (in weigh) of nickel, presents better results when happens successive loading and downloading can
Publicado em: 2008
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21. Otimização da análise isotópica de UF6 utilizando-se a técnica de espectrometria de massas por quadrupolo
A procedure for determining of the isotope ratio 235U/238U in UF6 samples was established using a quadrupole mass spectrometer with ionization by electron impact. The following items were optimized in the spectrometer: the parameters in the ion source that provided the most intense peak, with good shape, for the most abundant isotope; the resolution that red
Química Nova. Publicado em: 2008
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22. Insconsciente e educação : implicações da psicanálise na formação do pedagogo
The way that the pedagogy has to understand the education is based on lines of direction that estimate to the teacher a national common base: the act to teach. The resume if it supports, mainly, in a formation of theoretical, practical and logic of the method matrix aiming at shape the profile of teacher ideal in the scope of the capitalist society of centur
Publicado em: 2008
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23. Thermal effects in a mechanical model for pseudoelastic behavior of NiTi wires
A mechanical model for pseudoelastic behavior of NiTi wires is proposed with the aim to predict the behavior of Shape Memory Alloys(SMA) damping wire elements in model structures. We have considered at first a simple linearwise stress-strain relationship to describe the basic isothermal behavior of the SMA members. Then, this basic model is modified in order
Materials Research. Publicado em: 2007-12
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24. Ligas do sistema Ni-Nb processadas por moagem de alta energia / SYSTEM ALLOY Ni-Nb PROCESSED VIA HIGH ENERGY MILLING
The present investigation, aim studying the Boron effect as amorphizing agent, in the Nickel-Niobium alloy, using the technique of High Energy Milling to using as master alloy for preparation of alloys Cu-Al-Ni susceptible to the shape memory effect. Using the milling of high energy is possible to extend the solubility limit of some alloy elements in the mat
Publicado em: 2007