Mechanical Phenomena
Mostrando 1-12 de 78 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. Materials from renewable resources: new properties and functions
Abstract: Sustainable production requires increasing use of raw materials from renewable sources, processed under mild conditions with minimal effluent production. These requirements are satisfied by using materials derived from biomass, in synergy with food and energy production. The possibilities of biomass are continuously enlarged by new findings, as in
An. Acad. Bras. Ciênc.. Publicado em: 21/10/2019
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3. Influence of coupling agents on the adhesion force of dissimilar overmolded polymers: a digital image correlation analysis
ABSTRACT The increase in the technical and functional requirements of plastic items has led the development of multimaterials. To achieve a good performance in the adhesion of dissimilar materials, in this case, polypropylene and coconut fiber composites, it is fundamental to understand the phenomena related to the specific interface. This work aims to evalu
Matéria (Rio J.). Publicado em: 16/09/2019
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4. Influence of graphene oxide on ‘in situ’ preparation of nanocomposites with polyvinyl butyral
ABSTRACT In this work, polyvinyl butyral (PVB) nanocomposites reinforced with 0.5 to 2.5 wt% of graphene oxide (GO) were synthesized via ‘in situ’ polymerization. PVB was obtained by condensation of hydroxyl groups of polyvinyl alcohol (PVA) with butyraldehyde (BU) Thermogravimetric analyzes (TGA) showed the increase in the thermal conductivity of the na
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.
Abstract A fragmentation model based on global load sharing (GLS) theory is developed to obtain stress-strain curves that describe the mechanical behavior of unidirectional composites. The model is named C N B + τ * because it is based on the Critical Number of Breaks model (CNB) and on the correction of the fiber matrix interfacial strength, τ *
Lat. Am. j. solids struct.. Publicado em: 15/08/2019
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6. Rediscutindo Soluções Numéricas de Equações de Onda
Resumo Nesta contribuição, é nosso principal objetivo apresentar um método numérico de solução da equação de onda, seja esta de origem mecânica ou eletromagnética. Baseando-nos nesta solução, podemos avaliar o comportamento destas ondas sob diferentes aspectos e condições, visto que, as ondas eletromagnéticas conseguem se propagar no vácuo,
Rev. Bras. Ensino Fís.. Publicado em: 27/06/2019
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7. Proposta experimental para análise das variáveis de estado dos gases com Arduino
Resumo Por se tratar de uma ciência amplamente aplicada nos ramos tecnológicos, é essencial que a física seja ensinada a partir de demonstrações dos fenômenos e com relações entre teoria e prática. No entanto, por diversos motivos, os professores optam por aulas puramente expositivas. De maneira geral, verifica-se que, dessa forma, os alunos não s
Rev. Bras. Ensino Fís.. Publicado em: 19/06/2019
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8. An efficient mechanical-probabilistic approach for the collapse modelling of RC structures
Resumo As estruturas em concreto armado são largamente utilizadas ao redor do mundo. Entretanto, a modelagem de seu complexo comportamento mecânico por formulações numéricas eficientes tem sido marginalmente apresentada na literatura. As formulações eficientes possibilitam a precisa e realista representação dos fenômenos mecânicos envolvidos e sã
Rev. IBRACON Estrut. Mater.. Publicado em: 20/05/2019
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9. Simulación computacional de un ensayo Erichsen aplicado a una chapa de acero DC-06
ABSTRACT Nowadays, the use of computer simulation on forming processes as stamping and its variants, is an habitual development activity of big industries, and also it is slowly being introduced in SME (Small and Mediumsize Enterprise). One of the main advantages of it is application lies-in the reduction of costs regarding new projects, products and process
Matéria (Rio J.). Publicado em: 19/07/2018
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10. Comparing the Schrödinger and Dirac Descriptions of an Electron in a Uniform Magnetic Field
Abstract In this article we present a detailed description, using ladder operators, of an electron in a uniform magnetic field evolving under the Schrödinger equation. We go on to describe the same physical system in terms of relativistic quantum mechanics using the Dirac equation and to compare the two models in detail. The main differences between these t
Rev. Bras. Ensino Fís.. Publicado em: 11/06/2018
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11. An Overview of Research into Low Internal Friction Optical Coatings by the Gravitational Wave Detection Community
The direct detection of gravitational waves by ground-based interferometric gravitational wave detectors in recent years has opened a new window of the universe, allowing the astrophysical observations of previously unexplored phenomena, such as the collisions of black holes and neutron stars. However, small thermodynamic fluctuations of the density of the t
Mat. Res.. Publicado em: 24/05/2018
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12. In Situ Synchrotron Radiation Measurements During Axial Strain In Hydrogen Cathodically Charged Duplex Stainless Steel SAF 2205
The objective of this work is the evaluation of hydrogen effects on the martensitic transformation and strain hardening in Duplex Stainless Steels (DSS) SAF 2205 (UNS S32205/S31803). DSS are two-phase alloys (austenite and ferrite), which are used for applications requiring high mechanical strength, in corrosive environments. Therefore, it is necessary a bet
Mat. Res.. Publicado em: 18/12/2017