Mechanical Hysteresis
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Cation Vacancies in NiFe2O4 During Heat Treatments at High Temperatures: Structural, Morphological and Magnetic Characterization
Nickel ferrite (NiFe2O4) was synthesized by mixing stoichiometric amounts of α-Fe2O3 and NiO using mechanical milling and heat treatments at high temperatures. The physical characterization of the samples was carried out using X-ray diffraction, infrared and Raman spectroscopies, Mössbauer spectrometry, magnetization measurements, scanning electron microsc
Mat. Res.. Publicado em: 20/12/2019
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2. Influence of Mechanical Cycling on Residual Strain in Superelastic Cu-Al-Be-Nb Alloys
The understanding of the stabilization mechanism of martensite used to obtain alloys with high hysteresis and the possibility of recovering this martensite (residual strain) by heating at temperatures higher than As and Af have been fundamental for application in bonding devices. One of the possibilities to enhance residual strain is through mechanical cycli
Mat. Res.. Publicado em: 15/07/2019
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3. Failure behavior monitoring and evaluation of steel-confined reinforced concrete columns by acoustic emission under quasi-static loading
Abstract The mechanical behavior and failure evolution of steel-confined and unconfined reinforced concrete (RC) columns are investigated under quasi-static loading through acoustic emission (AE) signal. The excellent hysteresis response, lighter damage characteristics and delayed catastrophe of steel-confined RC columns are verified. Characteristic AE param
Lat. Am. j. solids struct.. Publicado em: 01/11/2018
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4. An investigative case study at local hospital into the current reliability of blood pressure sphygmomanometers
Abstract Introduction Arterial Blood Pressure is a significant indicator of the current health condition of an individual. The correct detection of hypertension is essential, where this health problem is considered as one of the greatest health risks factors that affect the heart and circulatory system. This paper presents the importance of the application
Res. Biomed. Eng.. Publicado em: 06/04/2017
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5. Influence of Milling Time During the Mechanical Alloying Process on the Properties of Fe-3Si-0.75P Alloy
AbstractIn this study the soft magnetic alloy Fe-3Si-0.75P (wt%) was obtained by mechanical alloying through powder metallurgy. The processing included the formulation of metallic powder, wet milling for 1 h, 3 h, 6h and 9 h, in an attritor mill using alcohol P.A. as a lubricant. Cold compaction was then performed in a floating die under 600 MPa pressure and
Mat. Res.. Publicado em: 2015-10
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6. Recrystallization of a Ti-45Ni-5Cu cold-worked shape memory alloy characterized by thermoelectric power and electrical properties
The recrystallization of a cold-worked shape memory alloy (SMA) without R-phase transition, i.e. the Ti-45.0Ni-5.0Cu (% at.), has been studied by thermoelectric power (TEP) technique and electrical resistivity change (Dρ) on several heat treated samples after cold working. This study was also supported by differential scanning calorimetry (DSC), transmissio
Mat. Res.. Publicado em: 01/08/2014
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7. 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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8. Modelagem da dinâmica vertical de coxins elastoméricos de motor através de método de redes neurais / Modeling vertical dynamic of elastomeric engine mounts using artificial neural networks
This dissertation scope is the modeling of an elastomeric mount, element which has primordial role on powertrain vibration isolation. The study of the mechanic behavior of those elastomeric materials is a field being studied for several years agor since its complexity and non-linarity of those components; and a reliable math models are competitive edge. So t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/10/2011
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9. The effect of residence time on the tensile properties of superelastic and thermal activated Ni-Ti orthodontic wires
Since the 1980s, different devices based on superelastic alloys have been developed to fulfill orthodontic applications. Particularly in the last decades several researches have been carried out to evaluate the mechanical behavior of Ni-Ti alloys, including their tensile, torsion and fatigue properties. However, studies regarding the dependence of elastic pr
Materials Research. Publicado em: 05/08/2011
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10. Desenvolvimento de um módulo de compensação para ajuste de deslocamento utilizando molas de poliuretano
A intensa demanda por petróleo aliado às novas descobertas de poços em condições ainda inexploradas, propulsionam a pesquisa e desenvolvimento de novos componentes e materiais para a indústria petrolífera. A alta responsabilidade desses componentes, como Risers e Bend Stiffners, requer, que antes da sua aplicação em campo, seja realizada uma verific
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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11. 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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12. Chaves MEMS aplicadas a dispositivos de RF e micro-ondas : projeto, tecnologia e implementação fisica de deslocador de fase e filtro sintonizavel / MEMS switches applied to RF and microwave devices : design, technology and physical implementation of phase shifter and tunable filter
O propósito deste trabalho é, a partir dos conceitos de linhas de transmissão, teoria de filtros e o conhecimento pioneiro deste grupo acerca das chaves MEMS de RF, propor duas aplicações reais baseadas nesta estrutura singular: um deslocador de fase e um filtro sintonizável na faixa de 0,1-35GHz e banda Ku (12,4-18GHz) respectivamente. Uma abordagem p
Publicado em: 2009