Shape Memory
Mostrando 1-12 de 117 artigos, teses e dissertações.
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1. Identidades caribenhas: crioulização em Édouard Glissant
Resumo A consciência histórica tem sido o grande desafio das sociedades que desejam compreender sua identidade e se configurar no tempo. Provavelmente esse seja o esforço que Édouard Glissant, autor martinicano, tenha assumido por meio de suas obras: o árduo exercício de recuperar na opacidade da história os fragmentos dispersos que participam da comp
Soc. estado.. Publicado em: 09/12/2019
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2. Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys
This paper presents a thermal and microstructural characterization of Cu87-xAl13Nbx (wt%) high temperature shape memory alloys (HTSMA), with Nb contents ranging from 1 to 3%. The alloys were obtained by arc melting under argon atmosphere. Thermal characterization was performed by differential scanning calorimetry (DSC), revealing that the phase martensitic t
Mat. Res.. Publicado em: 28/11/2019
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3. 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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4. Influence of Zirconium Percentage on Microhardness and Corrosion Resistance of Ti50 Ni50-xZrx Shape Memory Alloys
To obtain high temperature shape memory alloys of the lower cost Ni-Ti-X system, elements such as Hf and Zr are introduced to modify the thermal and mechanical properties of these alloys. This work studied the production and characterization of Ti50 Ni50-x Zrx alloys (x = 0, 5, 10 at.%) with the aim of improving their thermal, mechanical and corrosion resist
Mat. Res.. Publicado em: 19/08/2019
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5. FE Modeling and Seismic Performance Evaluation of Hybrid SMA-Steel RC Beam-Column Joints
Abstract Severe permanent deformations of buildings during earthquakes have been found as one of the major causes of the instability and failure of structures. The application of superelastic Shape Memory Alloy rebars at the plastic hinge region of reinforced concrete beam-column joints (SESMA-BCJs) can eliminate the seismic residual deformations. Such self-
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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6. Effects of composition on transformation temperatures and microstructure of Ni-Ti-Hf shape memory alloys
Abstract High transformation temperature shape-memory alloys (HTSMA) usually present a martensitic transformation temperature (Ms) starting at 100 ºC. That is the case of high nickel Ni-Ti-Hf alloys. This article presents experimental results obtained from arc melting of Ni50Ti50-XHfX .at% (X = 8, 11, 14, 17 and 20 .at%) alloys. This process homogenized eve
REM, Int. Eng. J.. Publicado em: 2019-06
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7. Nonlinear analysis of shape memory alloy beam under the thermal and the mechanical loads
ABSTRACT In this paper, the tension-compression asymmetry of shape memory alloys (SMA), subjected to the thermal and the mechanical loads, is sufficiently explored. Taking a basis of stress-strain relationship and a concern for critical phase transformation, a new simple model of mechanics is established. Through the deflection lines under different load con
Matéria (Rio J.). Publicado em: 20/05/2019
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8. De la indiferencia entre lo temporal y lo eterno: Élites indígenas, cultura textual y memoria en las fronteras de América del Sur
Abstract In this article we analyze the indigenous textual culture of the Jesuit-Guarani missions and explore the applicability of a distinction - established in the literature of linguistics - between ‘temporal’ (secular) and ‘eternal’ (religious) writings. First, we propose a typology of missionary textual culture based on the different spaces used
Varia hist.. Publicado em: 16/05/2019
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9. The Von Restorff effect in the Brazilian version of the Rey Auditory Verbal Learning Test in an elderly population
RESUMO. Efeito de von Restorff (efeito de isolamento) refere-se ao estímulo que é mais facilmente lembrado em relação a outros em tarefas de memória. Tal efeito foi demonstrado em diferentes faixas etárias com diferentes metodologias. Objetivo: Investigar: a) presença do efeito de isolamento numa população idosa avaliada com a nova versão brasilei
Dement. neuropsychol.. Publicado em: 2019-03
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10. The Influence of Microstructure and Mechanical Resistance on the Shape Memory of Ecae Processed Stainless Fe-Mn-Si-Cr-Ni-Co Steel
In the current work, XRD, SEM, EBSD and TEM techniques were used to evaluate the microstructure of stainless Fe-Mn-Si-Cr-Ni-Co shape memory steel processed by ECAE and annealed for one hour at temperatures ranging from 650ºC to 950ºC. The results were then correlated with the mechanical and shape-memory properties of the steel. It was observed that the sam
Mat. Res.. Publicado em: 09/08/2018
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11. Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn
ABSTRACT The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe70Pd30, it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformatio
Matéria (Rio J.). Publicado em: 19/07/2018
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12. Study of the martensitic transition in Ni-Mn-Sn-Ti ferromagnetic shape memory alloys
ABSTRACT In the present work, mechanical spectroscopy measurements as a function of temperature and strain have been performed in (at.%) Ni50Mn37Sn13-xTix (x=0, 0.5 and 2) ferromagnetic shape memory alloys in order both to study martensitic transition phenomenon and also to determine its temperature of appearance. For mechanical spectroscopy measurements, a
Matéria (Rio J.). Publicado em: 19/07/2018