Shape Memory Effect
Mostrando 25-33 de 33 artigos, teses e dissertações.
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25. CaracterizaÃÃo termoelÃstica de atuadores helicoidais da liga Cu- Zn-AI com memÃria de forma
O advento dos materiais inteligentes ocorreu devido à crescente corrida tecnolÃgica com a introduÃÃo de novas tÃcnicas para o desenvolvimento de novos materiais capazes de proporcionar a produÃÃo de dispositivos heterodoxos resultando em melhorias funcionais aliadas a miniaturizaÃÃo e simplificaÃÃo. Esses dispositivos desenvolvidos a partir desses
Publicado em: 2007
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26. Electro-thermomechanical characterization of Ti-Ni shape memory alloy thin wires
The use of shape memory alloys (SMA) as smart structures and other modern applications require a previous evaluation of its performance under load as well as a training procedure. In general, these requirements lead to the design and assembly of a specific test bench. In this work, an experimental set-up was specially designed to perform the electro-thermome
Materials Research. Publicado em: 2006-03
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27. Desenvolvimento de um atuador de posição baseado em liga de memória de forma com resfriamento forçado. / Development of a position actuator based on a shape memory alloy with forced cooling.
Shape Memory Alloys (SMA) consist of a group of metallic materials that demonstrate the ability to return to some previously defined shape when subjected to the appropriate thermal cycle, due to shift in the materials crystalline structure. The change that occurs within SMAs crystalline structure is not a thermodynamically reversible process and results in h
Publicado em: 2006
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28. Influence of temperature on the properties and phase transformations in Ti-Nb alloys with 2%Al
Quenched alloys from the Ti-Nb system are of considerable scientific and applied interest due to properties such as superconductivity, shape memory effect and high damping capacity. In this work, Ti-Nb quenched alloys with 2 wt.% Al and Nb content varying from 15 to 40% were investigated with respect to effects on phase transformations, internal friction and
Matéria (Rio J.). Publicado em: 2006
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29. Desenvolvimento da técnica de identificação de fases por metalografia óptica com nanoindentação em liga inoxidável com efeito de memória de forma / Development of phase identification technique by optic metallography with nanoindentation in stainless alloys with shape memory effect
Neste trabalho foi estudada uma liga inoxidável Fe-Mn-Si-Cr-Ni-Co com efeito de memória de forma (EMF) e os objetivos principais foram otimizar a técnica de coloração por ataque químico (color etching) para identificação e análise das fases presentes na microestrutura, o que permitiu a determinação da dureza da martensita-? e da austenita-? atrav�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/12/2005
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30. Influence of the mechanical loading history on the stress assisted two way memory effect in a Ti-Ni-Cu alloy
In this work, several tests of thermal cycling under constant load are carried out on Ti-45.0Ni-5.0Cu (at%) shape memory wires. The properties related to the Stress Assisted Two Way Memory Effect (SATWME) of the material are investigated as a function of the mechanical loading history for the same temperature range during cooling and heating. For this reason
Materials Research. Publicado em: 2001-07
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31. Development of stainless alloys with shape memory effect : production and characterization / Desenvolvimento de ligas inoxidaveis com efeito de memoria de forma : elaboração e caracterização
É apresentado neste trabalho, pioneiro no Brasil, o desenvolvimento de ligas inoxidáveis com Efeito de Memória de Forma (EMF) assistido por transformação martensítica não termoelástica. Mostrou-se que a fusão por indução à vácuo é uma técnica adequada e que tanto o trabalho a quente como o trabalbo a frio são perfeitamente possíveis nas liga
Publicado em: 1996
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32. Positron-emission tomography imaging of long-term shape recognition challenges
Long-term visual memory performance was impaired by two types of challenges: a diazepam challenge on acquisition and a sensory challenge on recognition. Using positron-emission tomography regional cerebral blood flow imaging, we studied the effect of these challenges on regional brain activation during the delayed recognition of abstract visual shapes as com
The National Academy of Sciences of the USA.
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33. Deformation twinning in Ni–Mn–Ga micropillars with 10M martensite
The maximum actuation frequency of magnetic shape-memory alloys (MSMAs) significantly increases with decreasing size of the transducer making MSMAs interesting candidates for small scale actuator applications. To study the mechanical properties of Ni–Mn–Ga single crystals on small length scales, two single-domain micropillars with dimensions of 10×15×3
American Institute of Physics.