Bibliografie tematiche / Viscoelastic

Letteratura scientifica selezionata sul tema "Viscoelastic"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 8 giugno 2024

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Articoli di riviste sul tema "Viscoelastic"

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Egorova, Anna V., Alexey V. Vasiliev e Lina Bai. "Influence of the quality of viscoelastic removal on phacoemulsification results. Part 1. Type of the postoperative period course depending on the quality of viscoelastic removal in phacoemulsification". Ophthalmology Journal 14, n. 3 (15 novembre 2021): 35–40. http://dx.doi.org/10.17816/ov79098.

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BACKGROUND: The reasons for the development of postoperative reactive inflammation under optimal conditions for the operation are errors in the surgical technique and the presence of viscoelastic residues. The likelihood of developing ophthalmic hypertension exists with the use of viscoelastic of any type. Its incomplete evacuation can be explained by the difficult visualization due to its transparency. Analysis of the dependence of the postoperative period course on the quality of viscoelastic removal at phacoemulsification can be considered to be relevant and expedient. AIM: The aim was to study the type of the postoperative period course depending on the quality of viscoelastics removal at phacoemulsification. MATERIALS AND METHODS: 104 eyes of randomly chosen patients who underwent femto-laser assisted phacoemulsification, divided into 2 groups according to ophthalmic viscoelastics characteristics (colored or transparent). Both groups were split into 2 subgroups each depending on method of viscoelastics removal. Tonometry and biomicroscopy were performed 3 hours after phacoemulsification and on the post-op Day 1. Patients with Tyndall effect were examined daily until its disappearance. RESULTS: At comparable preoperative IOP indices, its elevation 3 hours after surgery took place in subgroups 2a and 2b, the highest being in subgroup 2a. The greatest number of eyes with Tyndall effect, at all follow-up periods, was found in subgroup 2a, the lowest in subgroup 1b. The total number of eyes with keratopathy (as epitheliopathy) observed 3 hours after surgery was 7, four of them being from subgroup 2a. CONCLUSIONS: The conducted research showed that the type of early postoperative period course of phacoemulsification depends on visualization possibility of the viscoelastic and of the method of its removal. Minimal changes of hydrodynamics and maximal number of eyes with absence of inflammation took place when using colored viscoelastic and impulse irrigation method.
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Loskutov, Igor A., e Anastasia I. Fedorova. "Phacoemulsification with IOL implantation at a critical level of corneal endothelial cells". Ophthalmology Reports 16, n. 3 (17 ottobre 2023): 63–69. http://dx.doi.org/10.17816/ov567921.

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BACKGROUND: Cataract phacoemulsification is one of the most frequently performed surgical procedures, and a decrease in the corneal endothelial cell density (ECD) is the main postoperative complication leading to visual impairment. The average cell loss after phacoemulsification is 4.0112.94% within a year, and within 2 months 5.29.1%. The use of viscoelastics helps to reduce this loss, but it is impossible to completely prevent it. AIM: Сomparison of ECD in the pre- and postoperative period of phacoemulsification using viscoelastic of different percentages at a critical level of corneal endothelial cells. MATERIALS AND METHODS: The study included 60 eyes with emmetropic refraction: in the first group: 30 eyes with initial cataract and low ECD level (1694/1218 cells/mm2), an apyrogenic moderately cohesive viscoelastic 1.6% sodium hyaluronate solution (Kogevisk, Solopharm) was used, in the second group: 30 eyes with mature cataract and ECD level (1646/1183 cells/mm2) an apyrogenic, highly purified viscoelastic was used, consisting of medium-molecular fractions of chondroitin sodium sulfate 4% and sodium hyaluronate 3% (Adhevisk, Solopharm). Before surgery and a month after surgery, patients were tested for uncorrected visual acuity in the distance, ECD measurements, and intraocular pressure measurement. RESULTS: In phacoemulsification with IOL implantation, the use of viscoelastics of different percentages shows that the condition of the cornea remained stable a month after surgery. Postoperative ECD loss in all clinical cases, regardless of the stage of cataract, was less than 3%. CONCLUSIONS: Viscoelastics allow to solve the tasks set: in the case of cohesive maintaining the depth of the anterior chamber and the width of the pupil, adhesive protecting the corneal endothelium, good visualization. Rational consistent use of adhesive and cohesive components facilitates basic manipulations during phacoemulsification and IOL implantation. To do this, it is necessary to correctly use and select viscoelastic for a particular operation based on the number of endothelial cells.
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&NA;. "Viscoelastic". Reactions Weekly &NA;, n. 387 (febbraio 1992): 8. http://dx.doi.org/10.2165/00128415-199203870-00032.

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ROSEN, E. S. "Viscoelastic". British Journal of Ophthalmology 83, n. 6 (1 giugno 1999): 759c. http://dx.doi.org/10.1136/bjo.83.6.759c.

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Stoll, Robert D. "Bottom sediments—Viscoelastic, poroelastic, or poro‐viscoelastic?" Journal of the Acoustical Society of America 84, S1 (novembre 1988): S151. http://dx.doi.org/10.1121/1.2025872.

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Li, ZL, DG Sun, BH Han, B. Sun, X. Zhang, J. Meng e FX Liu. "Response of viscoelastic damping system modeled by fractional viscoelastic oscillator". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, n. 17 (6 aprile 2016): 3169–80. http://dx.doi.org/10.1177/0954406216642477.

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The fractional model considering geometric factor of viscoelastic damping systems is proposed by adopting fractional viscoelastic oscillator. To obtain dynamic responses of the fractional model, a numerical method is derived based on matrix function theory and Grumwald–Letnikov discrete form of fractional derivative. As a special engineering application example, the vibration response of the viscoelastic suspension installed in heavy crawler-type vehicles is studied through the proposed model. Furthermore, the parameter influence on the vibration control capability of the viscoelastic suspension is researched. The results indicate that the fractional viscoelastic oscillator is a favorable choice to characterize the dynamic behavior of viscoelastic damping structures. Additionally, the parameters in fractional viscoelastic oscillator namely geometric factor and fractional order exert considerable impact on the dynamic response of viscoelastic damping structures.
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Nemoto, Norio. "Viscoelastic Measurements." Kobunshi 40, n. 8 (1991): 540–43. http://dx.doi.org/10.1295/kobunshi.40.540.

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Takahashi, Masaoki. "Viscoelastic Measurements". Kobunshi 42, n. 12 (1993): 972–75. http://dx.doi.org/10.1295/kobunshi.42.972.

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Natrajan, Srinivas. "VISCOELASTIC MATERIAL". Optometry and Vision Science 67, n. 2 (febbraio 1990): 153. http://dx.doi.org/10.1097/00006324-199002000-00019.

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Florén, Ingrid. "Viscoelastic Purity". Journal of Cataract & Refractive Surgery 24, n. 2 (febbraio 1998): 145–46. http://dx.doi.org/10.1016/s0886-3350(98)80185-5.

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Tesi sul tema "Viscoelastic"

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Ruas, Henriques Isadora. "Analysis, characterization and modeling of viscoelastic and poro-viscoelastic materials". Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAC044.

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Cette thèse porte sur la modélisation et la caractérisation du comportement thermomécanique des matériaux viscoélastiques et poro-viscoélastiques. Le travail est divisé en deux parties principales : l'une concernant la technique expérimentale d'Analyse Mécanique Dynamique (DMA) et l'autre relative aux performances d'amortissement des matériaux poro-viscoélastiques. Dans la première partie, la propriété viscoélastique connue comme le module complexe mesuré par les modes de flexion du DMA est examinée théoriquement et expérimentalement. Une attention particulière est portée aux effets des modes de fonctionnement et des machines. Dans le but d'obtenir une meilleure analyse des impacts des écarts constatés, des modèles de dérivées fractionnaires (FDM) sont calibrés dans le cadre bayésien. Les résultats montrent que les DMA présentent une grande variabilité entre les modes ou les fabricants et les modèles statistiques peuvent atténuer ces problèmes. Dans la deuxième partie, la dissipation d'énergie mécanique inhérente à la viscoélasticité de trois matériaux poreux différents est explorée dans le domaine des basses fréquences. Initialement, une approche numérique est proposée pour générer des prédictions dans le domaine temporel de leur comportement hystérique sous différentes conditions de chargement. Ensuite, un modèle d'éléments finis qui considère un FDM est proposé pour décrire le comportement de panneaux simplement appuyés recouverts d'une couche libre de matériau poreux. Des expériences sont menées pour valider le modèle proposé. Enfin, une méthode inverse basée sur l'inférence bayésienne a été présentée pour identifier les propriétés viscoélastiques de ces matériaux. Les résultats de ces analyses ont montré le grand potentiel des matériaux poro-viscoélastiques à appliquer afin d'amortir les vibrations mécaniques
This thesis deals with the modeling and characterization of the thermomechanical behavior of viscoelastic and poro-viscoelastic materials. The work is divided into two main parts: one concerning the experimental technique Dynamic Mechanical Analysis (DMA) and the other related to the damping performance of poro-viscoelastic materials. In the first part, the viscoelastic property known as complex modulus measured by the flexural modes of DMA is deeply examined theoretically and experimentally. Special attention is paid to the effects of operational modes and machines on various properties. Aiming to obtain a better analysis of the impacts of the discrepancies found, fractional derivative models (FDM) are calibrated within the Bayesian framework. Results show that DMAs have a great variability between modes or manufacturers and statistical models may mitigate these issues. In the second part, the dissipation of mechanical energy inherent to the viscoelasticity of three different porous materials is explored in the low-frequency range. Initially, a numerical approach is proposed to generate predictions in the time domain of the hysteretic behavior of the analyzed materials under different loading conditions. Then, a finite element model that considers a FDM is proposed to describe the behavior of simply supported panels covered with a free-layer of porous material. Experiments are carried out to validate the proposed model. Finally, an inverse method based on Bayesian inference was presented to identify the viscoelastic properties of these materials from vibration tests. The results of these analyses showed the great potential of poro-viscoelastic materials to be applied to damp mechanical vibrations
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Lin, Kuanchung J. "Modeling viscoelastic jets /". The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487594970651388.

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Inch, Scott E. "Precise energy decay rates for some viscoelastic and thermo-viscoelastic rods". Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39978.

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Energy dissipation in systems with linear viscoelastic damping is examined. It is shown that in such viscoelastically damped systems the use of additional dissipation mechanisms (such as boundary velocity feedback or thermal coupling) may not improve the rate of energy decay. The situation where the viscoelastic stress relaxation modulus decreases to its (positive) equilibrium modulus at a subexponential rate, e.g., like (1 + t)-x + E, where α > 0, E > 0 is examined. In this case, the nonoscillatory modes (the so-called creep modes) dominate the energy decay rate. The results are in two parts. In the first part, a linear viscoelastic wave equation with infinite memory is examined. It is shown that under appropriate conditions on the kernel and initial history, the total energy is integrable against a particular weight if the kinetic energy component of the total energy is integrable against the same weight. The proof uses energy methods in an induction argument. Precise energy decay rates have recently been obtained using boundary velocity feedback. It is shown that the same decay rates hold for history value problems with conservative boundary conditions provided that an a priori knowledge of the decay rate of the kinetic energy term is assumed. In the second part, a simple linear thermo-viscoelastic system, namely, a viscoelastic wave equation coupled to a heat equation, is examined. Using Laplace transform methods, an integral representation formula for W(x,s), the transform of the displacement w(x, t), is obtained. After analyzing the location of the zeros of the appropriate characteristic equation, an asymptotic expansion for the displacement w(O,t) is obtained which is valid for large t and the specific kernel g(t) = g(–) + δtη-1 [over]Î (η), 0 < η < 1. With this expansion it is shown that the coupled system tends to its equilibrium at a slower rate than that of the uncoupled system.
Ph. D.
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Tang, Bin. "Nanoindentation of viscoelastic materials". Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B3655408X.

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Atsbha, Hailemariam. "Viscoelastic flows around spheres". Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/7909.

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The present thesis is concerned with the flow of viscoelastic liquids in channels and around spheres contained in cylinders. Problems that have been tackled are the Poiseuille flow between parallel plates and in tubes, where all models give excellent results checked against analytical solutions for a range of elasticity levels determined by a dimensionless Weissenberg number (Ws). The drag coefficient on the sphere shows a monotonic decrease with increasing Ws, from 5.9522 for Ws = 0 to 5.4935 for Ws = 0.3. Non-zero second normal stress differences decrease the drag even further. The unbounded flow around spheres was simulated using a 50:1 diameter ratio. Findings suggest that slip on the sphere surface may be occurring at moderate to high Ws numbers, which has the effect of lowering the drag calculated on the sphere. (Abstract shortened by UMI.)
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Johnson, Mitchell A. "Viscoelastic Roll Coating Flows". Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/JohnsonMA2003.pdf.

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Messalti, Mansour. "Viscoelastic damping of beams /". Online version of thesis, 1988. http://hdl.handle.net/1850/10414.

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Tang, Bin, e 唐斌. "Nanoindentation of viscoelastic materials". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B3655408X.

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JUNIOR, WALTER MENEZES GUIMARAES. "BUCKLING OF VISCOELASTIC STRUCTURES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9164@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Este trabalho apresenta um modelo computacional aplicável à análise de sistemas estruturais viscoelásticos submetidos a grandes deslocamentos, com particular atenção ao fenômeno da instabilidade. A discretização dos modelos é obtida através de elementos finitos isoparamétricos bidimensionais que podem ser empregados na análise de colunas, pórticos, arcos e cascas axissimétricas. A estabilidade elástica do sistema é verificada ao longo de trajetórias de equilíbrio definidas no espaço carga-deslocamentos, onde a ocorrência de pontos de bifurcação ou de pontos-limite é indicada através da troca de sinal do pivô da matriz de rigidez tangente. A inclusão de um modelo viscoelástico linear para o material possibilita a avaliação do efeito do tempo de carregamento sobre a carga de flambagem da estrutura. O mecanismo de instabilidade correspondente à flambagem viscoelástica envolve duas variáveis básicas: a magnitude da carga (carga crítica) e a duração da carga (tempo crítico). Os exemplos apresentados ilustram esses conceitos e fornecem resultados interessantes a respeito dos efeitos da viscoelasticidade sobre a flambagem em diferentes sistemas estruturais.
This thesis presents a computational model for the analysis of viscoelastic structures undergoing large displacements, with particular attention to unstable phenomena. The discrete model utilizes two-dimensional isoparametric finite elements in the analysis of columns, frames, arches and axially symmetric shells. The elastic stability of the system is verified along the equilibrium paths in the multidimensional load-displacements space, with bifurcation or limit points indicated by sign changes of the pivot of the tangent stiffness at every incremental step. A linear viscoelastic model for the material is included, allowing for the consideration of the effect of loading time on the buckling load for the structure. Thus, the mechanism leading to loss of stability, corresponding to viscoelastic buckling, involves two basic variables: load magnitude and duration of the load, designated as critical load and critical time. The examples presented herein enlighten such concepts and provide interesting results about viscoelastic effects on buckling of different structural systems.
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Ramsay, John Andrew. "Mixing of viscoelastic fluids". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7333/.

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This work investigates the laminar mixing performance of viscoelastic fluids in laboratory-scale batch stirred tanks agitated by “butterfly” impellers and in-line Kenics KM static mixers. Constant-viscosity viscoelastic (Boger) fluids were formulated to investigate viscous and elastic effects separately; multiphase viscoelastic suspensions were formulated from 40-50 volume% glass spheres in glycerol. Particle Image Velocimetry in stirred tanks agitated by high impeller-to-tank diameter ratio butterfly impellers (D/T=0.98) showed that secondary flows in Boger fluid increased solid body rotation and reduced local shear rates (≤16 s-1) compared to equivalent viscosity Newtonian fluids, though the effect was non-monotonic. Mixing times obtained from Planar Laser Induced Fluorescence (PLIF) increased by ≤23%. Positron Emission Particle Tracking in multiphase suspensions showed increased axial mixing due to more dominant secondary flows. In static mixers, Boger fluid striation patterns at the mixer outlet obtained from PLIF showed time dependence and flow instability due to reduced local shear rates. Energy consumption in all geometries displayed an increase of ≤200% with viscoelastic fluids. Using a generalised Reynolds number Reg enabled viscoelastic power draw prediction, previously only possible through empirical relationships. Overall, viscoelasticity generally increases energy consumption whilst reducing blending performance though the link between elasticity and mixing quality is highly non-linear.
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Libri sul tema "Viscoelastic"

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Hoffmann, Karl, e Otto Hockwin, a cura di. Viscoelastic Substances. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9.

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Viscoelastic materials. Cambridge: Cambridge University Press, 2009.

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3

Viscoelastic solids. Boca Raton: CRC Press, 1999.

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Buhariwala, Kerman J. Dynamics of viscoelastic structures. [S.l.]: [s.n.], 1988.

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Buhariwala, Kerman Jamshed. Dynamics of viscoelastic structures. Downsview, Ont: Institute for Aerospace Studies, 1986.

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1937-, Rao M. A., e Steffe J. F, a cura di. Viscoelastic properties of foods. London: Elsevier Applied Science, 1992.

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Drozdov, Aleksey D. Mechanics of viscoelastic solids. Chichester: John Wiley Sons, 1998.

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Hajikarimi, Pouria, e Alireza Sadat Hosseini. Constructional Viscoelastic Composite Materials. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1786-0.

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Joseph, Daniel D. Fluid Dynamics of Viscoelastic Liquids. New York, NY: Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4612-4462-2.

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Borcherdt, Roger D. Viscoelastic waves in layered media. New York: Cambridge University Press, 2008.

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Capitoli di libri sul tema "Viscoelastic"

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Gooch, Jan W. "Viscoelastic". In Encyclopedic Dictionary of Polymers, 797. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12587.

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Hoffmann, K. "Welcome". In Viscoelastic Substances, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_1.

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Laqua, H. "Functional and Anatomical Results in Silicon Oil Surgery of Posterior Eye Segments". In Viscoelastic Substances, 62–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_10.

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Apple, D. J. "Histopathological Findings". In Viscoelastic Substances, 69–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_11.

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Marlow, B. "Viscoelastic Substances — Regulatory Aspects from the Industry Point of View". In Viscoelastic Substances, 80–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_12.

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Tschöpe, E. "Assessment of Viscoelastic Substances in the Registration Procedure". In Viscoelastic Substances, 84–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_13.

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Schorn, G. "Viscoelastic Substances — Classification into the Framework of German Legislation". In Viscoelastic Substances, 93–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_14.

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Blais, P. "Regulatory Aspects of Bioinert Substances". In Viscoelastic Substances, 101–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_15.

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Hoffmann, K. "Summary". In Viscoelastic Substances, 118. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_16.

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Hockwin, O. "Viscoelastic Substances — An Introduction". In Viscoelastic Substances, 3–5. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88653-9_2.

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Atti di convegni sul tema "Viscoelastic"

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Chowdhuri, M. A. K., e Z. Xia. "Stress Singularity Analysis of a Viscoelastic/Viscoelastic Bonded Joint". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86372.

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Measurement of bi-material interface bonding strengths has drawn considerable attentions because damages or failures are most likely to occur at the interfaces in many advanced materials and structures. However, the measurement of the interface bonding strength is hindered by the presence of the stress singularity at the interface corner. In order to determine the actual bonding strength of bi-material interface, the determination/elimination of the stress singularity is thus very crucial. This paper presents an analytical model for the determination of the stress singularity and its elimination for a viscoelastic/viscoelastic bonded joint. Two viscoelastic materials with different material properties are considered for this study. Each material is modelled as a standard linear solid and the properties of both materials are considered as time-dependent. The elastic-viscoelastic corresponding principle is used to find the analytical solution for the subjected viscoelastic/viscoelastic bonded joint from the available analytical solution for an elastic/elastic bonded joint. The developed solution is applied for a bonded joint between Polyvinyl-chloride (PVC) and Epoxy materials. It is found that the stress singularity at the interface corner may increase with time due to the viscoelasticity of the materials. Finite element analyses have also been carried out to verify the results obtained from the analytical solution and the two results are in good agreement.
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Ashrafi, Nariman. "Viscoelastic Abrasive Waterjet". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63051.

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Effect of addition of viscoelastic additive on the stability and precision enhancement of the abrasive waterjet is studied. Cornstarch is chosen to be added to the mixture of water and abrasive for it is readily available in large quantities at low cost. Yet it shows major nonlinear properties valuable for waterjet machining. It is shown that the normal stresses developed in the nonlinear viscoelastic cornstarch remains substantially unchanged throughout effective jet length resulting in an almost completely prismatic jet, most desirable for precision and straight machining. Furthermore, the jet becomes more stable upon increasing the cornstarch percentage. The additive also causes the jet to produce less friction with the surrounding air avoiding possible jet disintegration. Clearly, due to the increase of elastic as well as viscous effects, there is restriction to the pump delivery upon adding the dilatant cornstarch. Different percentages of the additive are therefore examined. It is found that, a 22% additive results in the best performance based on the precision, available pump power and stability of the jet. The experiment was carried out on three products; marble, aluminum and glass. In all cases, kerf angle was reduced significantly. Simulation of the problem is in good agreement with the experimental observations.
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Keshavarz, Bavand, Michela Geri e Gareth McKinley. "Poster: Viscoelastic Fishbones". In 71th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2018. http://dx.doi.org/10.1103/aps.dfd.2018.gfm.p0045.

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Ashrafi, Nariman, e Sepideh Samghani. "Oscillating Viscoelastic Flow". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85635.

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The flow of nonlinear viscoelastic fluids between oscillating parallel plates is investigated. The investigation features time-dependent analysis of a complicated viscoelastic material modeled based on the Johnson-Segalman constitutive relation. Given the rheological parameters of certain material known from experiments, the coefficients of Johnson-Segalman constitutive equation model for the material are evaluated by fitting the data. The problem is first formulated by writing the governing equations for the flow between two independently oscillating parallel plates, i.e. oscillating Couette flow. The velocity and stress are represented by symmetric and antisymmetric Chandrasekhar functions in space. Both inertia and normal stress effects are included. A numerical scheme is applied to solve the governing equations in time domain projected by Galerkin method. For given Reynolds number and viscosity ratio, one critical Weissenberg numbers is found at which an exchange of stability occurs between the Couette and other steady flows. The model is capable of predicting the nonlinear amplitude-dependent behavior of viscoelastic flows under single and multiple-frequency excitations.
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Maly, Joseph R., e Conor D. Johnson. "Cocured viscoelastic composites". In 1996 Symposium on Smart Structures and Materials, a cura di Conor D. Johnson. SPIE, 1996. http://dx.doi.org/10.1117/12.239104.

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Minami, T., e Shumpei Hara. "Experimental Lagrangian study of viscoelastic vibration in viscoelastic turbulent channel flow". In 10th International Symposium on Turbulence, Heat and Mass Transfer, THMT-23, Rome, Italy, 11-15 September 2023. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/ichmt.thmt-23.1440.

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Minami, T., e Shumpei Hara. "Experimental Lagrangian study of viscoelastic vibration in viscoelastic turbulent channel flow". In 10th International Symposium on Turbulence, Heat and Mass Transfer, THMT-23, Rome, Italy, 11-15 September 2023. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/thmt-23.1440.

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8

Carcione, J., e F. Cavallini. "Viscoelastic rheologies via eigenstrains". In 55th EAEG Meeting. European Association of Geoscientists & Engineers, 1993. http://dx.doi.org/10.3997/2214-4609.201411435.

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Harlen, O. G. "SIMULATION OF VISCOELASTIC FLOWS". In Proceedings of the First European Coating Symposium. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814503914_0030.

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Blanch, J. O., J. O. A. Robertsson e W. W. Symes. "Viscoelastic finite‐difference modeling". In SEG Technical Program Expanded Abstracts 1993. Society of Exploration Geophysicists, 1993. http://dx.doi.org/10.1190/1.1822675.

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Rapporti di organizzazioni sul tema "Viscoelastic"

1

Simonson, Robert Joseph, e Alan W. Staton. Viscoelastic coupling of nanoelectromechanical resonators. Office of Scientific and Technical Information (OSTI), settembre 2009. http://dx.doi.org/10.2172/993930.

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2

Buechler, Miles A. A viscoelastic viscoplastic damage model. Office of Scientific and Technical Information (OSTI), settembre 2013. http://dx.doi.org/10.2172/1095221.

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3

Lester, Brian T., e Kevin Nicholas Long. Numerical Integration of Viscoelastic Models. Office of Scientific and Technical Information (OSTI), settembre 2019. http://dx.doi.org/10.2172/1567985.

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Scheidler, Mike. Viscoelastic Models for Nearly Incompressible Materials. Fort Belvoir, VA: Defense Technical Information Center, settembre 2009. http://dx.doi.org/10.21236/ada508118.

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5

Bardenhagen, S. G., E. N. Harstad, P. J. Maudlin, G. T. Gray e J. C. Jr Foster. Viscoelastic models for explosive binder materials. Office of Scientific and Technical Information (OSTI), luglio 1997. http://dx.doi.org/10.2172/627369.

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6

Buechler, Miles, Darby Luscher e Nathan Miller. A viscoelastic viscoplastic damage model (VPVD). Office of Scientific and Technical Information (OSTI), febbraio 2021. http://dx.doi.org/10.2172/1764867.

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7

Potter, Trevor. Dynamics and Stability of Rolling Viscoelastic Tires. Office of Scientific and Technical Information (OSTI), aprile 2013. http://dx.doi.org/10.2172/1171547.

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Weitsman, Y. A Continuum Diffusion Model for Viscoelastic Materials. Fort Belvoir, VA: Defense Technical Information Center, novembre 1988. http://dx.doi.org/10.21236/ada202588.

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9

Maly, J. R., e T. A. Butler. Viscoelastic struts for vibration mitigation of FORTE. Office of Scientific and Technical Information (OSTI), maggio 1996. http://dx.doi.org/10.2172/226056.

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CSA ENGINEERING INC PALO ALTO CA. Properties of Viscoelastic Materials Under Centrifugal Loads. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1998. http://dx.doi.org/10.21236/ada361420.

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