Superelasticity
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Influence of Directional Solidification on the Mechanical Properties of Cu-Al-Be-Nb-Ni Alloy
Copper-based polycrystalline shape memory alloys (SMAs) have limitations for many practical applications due to their low superelasticity and low ductility. In order to overcome this situation, in recent years, the production of copper-based SMAs by directional solidification process has attracted the interest of many researches. In this sense, the present w
Mat. Res.. Publicado em: 05/09/2019
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2. Analysis of Compositional Modification of Commercial Aluminum Bronzes to Obtain Functional Shape Memory Properties
In copper-based shape memory alloys (SMAs), some exceptional phenomena, such as the shape memory effect (SME) or superelasticity (SE), are observable. However, commercial aluminum bronzes, Cu3Al-based alloys, do not present these functional properties (SME and/or SE) in their original state. Thus, since one of the main copper-based SMA systems is the Cu-Al-N
Mat. Res.. Publicado em: 17/08/2017
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3. Superelasticity and force plateau of nickel-titanium springs: an in vitro study
resumo Objetivo: o presente artigo analisou se as molas helicoidais fechadas de níquel-titânio apresentam superelasticidade (SE), de acordo com a ativação, e se o platô de força medido corresponde ao informado pelo fabricante. Material e Métodos: 160 molas foram divididas em 16 subgrupos, de acordo com suas características, e foram ativadas propo
Dental Press J. Orthod.. Publicado em: 2016-06
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4. Superelasticity in Polycrystalline Ni-Mn-Ga-Fe Microwires Fabricated by Melt-extraction
Ni48Mn26.4Ga19.7Fe5.9 microwires with grain size of 1-3 micron were successfully fabricated by melt-extraction. The superelastic effects in the microwires under various temperatures and loads were systematically demonstrated. The as-extracted microwires displayed partial superelasticity when attended at relatively high temperature. The critical stress for st
Mat. Res.. Publicado em: 23/10/2015
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5. 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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6. Influência da ciclagem térmica nas temperaturas de transformação de fase e quantificação das deformações residuais em ligas com memória de forma cu-al-be-nb-ni / INFLUENCE OF THERMAL CYCLING IN THE TEMPERATURES OF PHASE TRANSFORMATION AND MEASUREMENT OF RESIDUAL DEFORMATIONS IN SHAPE MEMORY ALLOYS Cu-Al-Be-Nb-Ni
Neste trabalho avaliou-se a influência de têmperas múltiplas, nas temperaturas de pico da transformação de fase (TPTF) e na microestrutura da liga Cu-11,8Al-0,6Be-0,5Nb-0,27Ni (% em peso), bem como a influência que deformações aplicadas, em temperaturas a partir de Ms, às ligas de composição nominal Cu-11,8Al-0,6Be-0,5Nb-0,27Ni, Cu-11,8Al-0,55Be-0
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2012
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7. 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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8. Electro-thermomechanical properties of superelasticity in single crystals shape memory alloys
In this work, superelastic behavior of single crystals shape memory alloys has been investigated by the electric resistivity (ER) measure technique coupled simultaneously during traction tests. Samples in austenitic phase were submitted to stress induced martensite (SIM) under several conditions such as: different temperatures, different deformation rate, th
Materials Research. Publicado em: 2010-06
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9. Avaliação das forças, momentos e binding, produzidos por deformação de primeira ordem do fio NiTi .014 superelástico, em braquetes autoligáveis passivos estudo in vitro / Evaluation of force, moment and binding produced by first order deformation on a superelastic .014 Niti wire using passive self-ligated brackets in vitro study
Bracket characteristics and wire stiffness dictate the mechanical effects that nickel titanium wire deformation will cause upon teeth. The main variables associated to bracket characteristics include bracket length (that influence interbracket distance), and coefficient of friction. The purpose of this research was to compare how self ligated brackets such a
Publicado em: 2010
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10. Determinação das propriedades termomecânicas de ligas Cu-Al-Ni e Cu-Al-Be com efeito memória de forma para utilização como atuadores mecânicos
Cu-Al-Ni and Cu-Al-Be shape memory alloys were cast under ambient atmosphere, and characterized thought optical microscopy, X-ray diffraction, and differential scanning calorimetry. Superelasticity, and shape recovery were evaluated using mechanical tensile test. Thermomechanical properties of shape memory alloys used were obtained under different temperatur
Publicado em: 2009
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11. Relation of forces and deflections during loading and unloading orthodontic nickel-titanium wires / "Relação entre força e deflexão na ativação e desativação de fios ortodônticos de níquel-titânio"
The purpose of this study was to evaluate the behaviour of force as function of loading and unloading orthodontic nickel-titanium wires. Three defferent brands (Forestadent, GAC and Morelli) were tested. Testing temperature were 32, 37 and 42 o C. Loading were up to 1, 2, 3 and 4mm deflection. Specimens consisted of a acrylic base where were fixed metallic c
Publicado em: 2005