Viscoelasticity
Mostrando 1-12 de 82 artigos, teses e dissertações.
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1. Effects of Frequency, Temperature and Test Duration in the Viscoelasticity of Brazilian Hardwoods Used in Handmade Musical Instruments
This study aims to make a comprehensive analysis on the viscoelastic behavior of typical tropical hardwoods and its influences in making musical instruments. For that a Dynamic-Mechanical Analysis was done and the mechanical parameters dependence on test control parameters like temperature, frequency and test duration time were measured. For Dalbergia Nigra
Mat. Res.. Publicado em: 24/10/2019
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2. Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers
Abstract This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh’s method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considere
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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3. Effect of hydroxyurea (HU) on gelatinization mechanism of type I collagen suspensions
ABSTRACT Mutant hemoglobins thermodynamic phase transitions (HbS, HbC, etc.) have been the causes of serious hemoglobinopathies that have been affecting mankind since the dawn of human race. HbS polymerization is the best known of these transitions and the original cause of sickle cell anemia. Hydroxyurea (HU, NH2CONHOH) is widely used as the main drug admin
Matéria (Rio J.). Publicado em: 06/12/2018
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4. Analytical solution for nonlinear dynamic behavior of viscoelastic nano-plates modeled by consistent couple stress theory
Abstract This paper analyses the non-stationary free vibration and nonlinear dynamic behavior of the viscoelastic nano-plates. For this purpose, a size-dependent theory is developed in the framework of the consistent couple stress theory for viscoelastic materials. The previously presented modified couple stress theory was based on some consideration making
Lat. Am. j. solids struct.. Publicado em: 17/09/2018
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5. A magneto-motive ultrasound platform designed for pre-clinical and clinical applications
Abstract Introduction Magneto-motive ultrasound (MMUS) combines magnetism and ultrasound (US) to detect magnetic nanoparticles in soft tissues. One type of MMUS called shear-wave dispersion magneto-motive ultrasound (SDMMUS) analyzes magnetically induced shear waves (SW) to quantify the elasticity and viscosity of the medium. The lack of an established pres
Res. Biomed. Eng.. Publicado em: 12/01/2017
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6. Effect of estrogen administration on middle cerebral arterial viscoelastic properties in aged female rats
ABSTRACT PURPOSE: To develop a model for studying cerebrovascular disease prevention in elderly women. METHODS: Sixty 18-month-old Sprague Dawley (SD) rats were randomly divided into an estrogen administration group (EA, n=30) and a non-administration group (NA, n=30); thirty 4-month-old SD rats were allocated to a control group. The EA group received estr
Acta Cir. Bras.. Publicado em: 2016-10
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7. Kelvin Viscoelasticity and Lagrange Multipliers Applied to the Simulation of Nonlinear Structural Vibration Control
Abstract This study proposes a new pure numerical way to model mass / spring / damper devices to control the vibration of truss structures developing large displacements. It avoids the solution of local differential equations present in traditional convolution approaches to solve viscoelasticity. The structure is modeled by the geometrically exact Finite Ele
Lat. Am. j. solids struct.. Publicado em: 2016-05
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8. The Performance of Crosslinking with Divinyl Sulfone as Controlled by the Interplay Between the Chemical Modification and Conformation of Hyaluronic Acid
Hyaluronic acid (HA) microparticles crosslinked with divinyl sulfone (DVS) are primarily used in viscosupplementation to restore the viscoelastic properties of synovial fluid in the treatment of joint diseases. The crosslinking degree provides the swelling and rheological properties required for injectable application and biological stability. In this work,
J. Braz. Chem. Soc.. Publicado em: 2015-03
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9. The effect of viscoelasticity on creep behavior of double-lap adhesively bonded joints
The effect of viscoelasticity of epoxy adhesive on creep behavior in the adhesive layer of a double-lap joint is studied in this paper. The joint is comprised of three elastic single isotropic adherend layers joined by an epoxy adhesive that is under shear loading. Prony series is used to modeling the relaxation modulus of epoxy adhesive. The differential eq
Lat. Am. j. solids struct.. Publicado em: 2014-01
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10. Proposição de um modelo matemático para o estudo da alteração mecânica do músculo liso da traquéia de ratos Wistar exposto à solução de formaldeído e submetido a doses crescentes de um agente contrátil / Proposition of a mathematical model to study the mechanical change of the smooth muscle of the trachea of Wistar rats exposed to formaldehyde solution and subjected to increasing doses of a contractile agent
The viscoelastic properties of the mammalian lung is mainly determined by the mechanical properties, structure and regulation of the airways smooth muscle. The exposure to polluted air may deteriorate these properties with harmful consequences to individual health. Formaldehyde is an important indoor pollutant that permeate through the smooth muscle tissue f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2012
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11. Efeito da homogeneização à alta pressão (HAP) nas propriedades reológicas de suco de tomate / Effect of high pressure homogenization (HPH) on the rheological properties of tomato juice
A homogeneização a alta pressão (HAP) tem sido estudada por diversos autores como metodologia não térmica para a conservação de alimentos, especialmente produtos de frutas. Trabalhos realizados com esses produtos e testes industriais indicam aumento de consistência devido a HAP. No entanto, poucos trabalhos da literatura estudam alterações físico-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/03/2012
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12. Aplicação de Modelos Teórico-Computacionais para Simulação do Comportamento Dinâmico de Estruturas Amortecidas Através de Materiais Viscoelásticos
O avanço da tecnologia de materiais e o desenvolvimento de novas técnicas de execução mais sofisticadas permitiram a construção de estruturas mais leves e com elevada capacidade portante. Este processo iniciado durante a revolução industrial se estende até os dias atuais e impôs a necessidade de se verificar, durante a fase de projeto, o comportame
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2012