Relevant bibliographies by topics / Visco Elastici

Academic literature on the topic 'Visco Elastici'

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Published: 11 March 2023

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Journal articles on the topic "Visco Elastici"

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Karaś, Sławomir, and Magdalena Sawecka. "The simple method of dynamic visco-elastic analysis of road structure. on rheological foundation." Budownictwo i Architektura 4, no. 1 (June 11, 2009): 073–83. http://dx.doi.org/10.35784/bud-arch.2335.

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In contrast to computationally advanced methods of road pavement dynamic analysis, the one-dimensional, simple method is derived on the basis of visco-elastic simple beam lying on generalized Winkler visco-elastic foundation. By virtue of least square method the visco-elastic constants could be estimated with technically admissible accuracy. The introduced method is useful enough to predict any pavement deformation process in the range of linear visco-elasticity.
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Roychoudhuri, S. K., and Santwana Mukhopadhyay. "Effect of rotation and relaxation times on plane waves in generalized thermo-visco-elasticity." International Journal of Mathematics and Mathematical Sciences 23, no. 7 (2000): 497–505. http://dx.doi.org/10.1155/s0161171200001356.

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The generalized dynamical theory of thermo-elasticity proposed by Green and Lindsay is applied to study the propagation of harmonically time-dependent thermo-visco-elastic plane waves of assigned frequency in an infinite visco-elastic solid of Kelvin-Voigt type, when the entire medium rotates with a uniform angular velocity. A more general dispersion equation is deduced to determine the effects of rotation, visco-elasticity, and relaxation time on the phase-velocity of the coupled waves. The solutions for the phase velocity and attenuation coefficient are obtained for small thermo-elastic couplings by the perturbation technique. Taking an appropriate material, the numerical values of the phase velocity of the waves are computed and the results are shown graphically to illustrate the problem.
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Wu, Li, Qing Jun Zuo, and Zhong Le Lu. "Study on the Constitutive Model of Visco-Elasticity-Plasticity Considering the Rheology of Rock Mass." Advanced Materials Research 639-640 (January 2013): 567–72. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.567.

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Considering the rheological mechanical characteristics of rock mass, a viscous-plastic model of rock mass which can describe the acceleration creep stage of rock mass was proposed. Moreover, combining with viscous-elastic shearing rheological model of rock mass in series, a new constitutive model of visco-elasticity-plasticity considering the rheology was constructed. Due to the shearing rheological curves of granite, the model of visco-elasticity-plasticity considering the rheology was identified and the rheological parameters of the model were obtained. The comparison between the viscous-elastic-plastic rheological model of rock mass and experimental result of granite shows that the accelerating rheological properties of rock mass can be depicted effectively by the constitutive model of visco-elasticity-plasticity considering the rheology.
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Das, Pravangsu Sekhar, P. R. Sengupta, and Lokenath Debnath. "Lamb's plane problem in a thermo-visco-elastic micropolar medium with the effect of gravity." International Journal of Mathematics and Mathematical Sciences 15, no. 4 (1992): 795–802. http://dx.doi.org/10.1155/s0161171292001030.

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A study is made of the Lamb plane problem in an infinite thermo-visco-elastic micropolar medium with the effect of gravity. The visco-elasticity is characterized by the rate dependent theory of micro-visco-elasticity generalizing the classical Kelvin-Voigt theory. The action of time harmonic loading is treated in detail. The solutions for the displacement fields, couple stresses and the temperature field are obtained in general and particular cases.
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Gupta, Urvashi, and Parul Aggarwal. "Thermal instability of compressible Walters’ (Model B′) fluid in the presence of Hall currents and suspended particles." Thermal Science 15, no. 2 (2011): 487–500. http://dx.doi.org/10.2298/tsci1102487g.

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Effect of Hall currents and suspended particles is considered on the hydromagnetic stability of a compressible, electrically conducting Walters? (Model B?) elastico-viscous fluid. After linearizing the relevant hydromagnetic equations, the perturbation equations are analyzed in terms of normal modes. A dispersion relation governing the effects of visco-elasticity, magnetic field, Hall currents and suspended particles is derived. It has been found that for stationary convection, the Walters? (Model B?) fluid behaves like an ordinary Newtonian fluid due to the vanishing of the visco-elastic parameter. The compressibility and magnetic field have a stabilizing effect on the system, as such their effect is to postpone the onset of thermal instability whereas Hall currents and suspended particles are found to hasten the onset of thermal instability for permissible range of values of various parameters. Also, the dispersion relation is analyzed numerically and the results shown graphically. The critical Rayleigh numbers and the wavenumbers of the associated disturbances for the onset of instability as stationary convection are obtained and the behavior of various parameters on critical thermal Rayleigh numbers has been depicted graphically. The visco-elasticity, suspended particles and Hall currents (hence magnetic field) introduce oscillatory modes in the system which were non-existent in their absence.
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Kleizienė, Rita, Audrius Vaitkus, and Donatas Čygas. "Influence of asphalt visco-elastic properties on flexible pavement performance." Baltic Journal of Road and Bridge Engineering 11, no. 4 (December 20, 2016): 313–23. http://dx.doi.org/10.3846/bjrbe.2016.36.

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Even though every layer of pavement structure is important and affects pavement performance, the asphalt layers visco-elasticity plays significant role. Bitumen properties, as well as asphalt mixture properties, vary depending on temperature and loading conditions. These variations influence entire pavement bearing capacity and has to be evaluated in pavement design. The main challenge is material behaviour description through simple models to incorporate them to pavement design. Generally, pavements are designed using Multilayer Elastic Theory assuming that all materials are elastic, isotropic, and homogenous. This paper presents analysis of two pavement structures response calculated according to three pavement design approaches. The dynamic modulus and phase angle of asphalt mixtures was estimated using Hirsch model after binder complex shear modulus tests. The visco-elastic behaviour was described with rheological Huet-Sayegh model and pavement responses estimation was done using MnLayer and ViscoRoute2 software. The analysis reviled static and dynamic load influence on pavement structure based on elastic and visco-elastic properties of asphalt layers. This allowed optimisation of layer thicknesses and determination of more cost beneficial pavement structure with appropriate performance.
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Watts, D. C. "Elastic moduli and visco-elastic relaxation." Journal of Dentistry 22, no. 3 (June 1994): 154–58. http://dx.doi.org/10.1016/0300-5712(94)90199-6.

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Manisha, Rana, and Surendra Kumar. "Visco-Elastic Fluid Model in an Inclined Porous Stenosed Artery with Slip Effect and Body Acceleration." International Journal of Applied Mechanics and Engineering 27, no. 4 (December 1, 2022): 82–104. http://dx.doi.org/10.2478/ijame-2022-0052.

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Abstract The present paper analyzes an unsteady magnetohydrodynamic blood flow model of an visco-elastic fluid through an inclined porous stenosed artery with body acceleration and slip effect. Navier-Stokes equations have been used to describe the blood flow model. The governing equation of blood flow is solved by an analytic method by considering blood as an incompressible, visco-elastic fluid, and suspension of RBC’s in plasma. Axial velocity, blood acceleration, flow rate, and shear stress are derived numerically by using the finite Laplace and Hankel transformation and their inverse. The effect of parameters such as the visco-elasticity parameter, Womersley number, Hartmann number, inclination angle, parameter of slip, and body acceleration frequency is analyzed. Axial velocity reduces as the Hartmann number and visco-elasticity parameter enhance and it enhances with the enhancement of the slip parameter and inclination angle. The study is beneficial for finding the effect of slip parameter, porosity factor and Hartmann number when a human body is exposed to MRI and CT scan.
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Zhang, Ying Ying, Qi Lin Zhang, and Chuan Zhi Zhou. "The Visco-Elastic Behaviors of PVC Coated Fabrics under Different Stress and Temperatures." Advanced Materials Research 168-170 (December 2010): 1476–79. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1476.

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The visco-elastic behaviors of coated fabrics are important for the design of membrane structure. In this paper, Ferrari 1002 is taken as the research object. The tests of creep and stress relaxation are carried out under five temperatures (23, 40, 50, 60, and 70 ) and three initial stresses (4, 15, and 26 kN/m), respectively. Results show that temperature and initial stress has great effects on the visco-elasticity of coated fabrics. With temperature and initial stress increasing, the visco-elastic behaviors are more obvious. The creep strain can be ignored compared with the corresponding elastic strain. After 24h, the remaining stress is less than 80% the initial stress. This paper can be references for the design of membrane structure.
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Yang, Peng, Hong Zhi Cui, and Wei Lun Wang. "Visco-Elasticity of Asphalt Mixture under Broad Temperature and Frequency." Advanced Materials Research 838-841 (November 2013): 156–61. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.156.

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In this study, the improved model of CAM with clear parameter was introduced. The visco-elasticity of asphalt mixture under broad temperature and frequency was studied and the properties of asphalt mixture at high asphalt and low temperature of was described by fitting the parameters of CAM model. The four equations of CAM model can be utilized in analysis of visco-elasticity of asphalt mixture and the physical meaning of the parameters in equations was very clear; Through nonlinear curve fitting , the CAM model was found to overcome the defect of deviation from the start and the end fitting; For one kind of asphalt mixture, the complex shear modulus and storage shear modulus was higher in same frequency at lower temperature, and the elasticity was in dominant position significantly; At middle temperature, the modulus of asphalt mixture became smaller; At high temperature, although the modulus was lower, the elasticity was higher. At middle-high temperature, the modulus of asphalt mixture remained smaller and the ratio of elasticity was minimum value, and asphalt mixture was recognized as typical visco-elastic body and was destroyed easily by the deformation disease.
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Dissertations / Theses on the topic "Visco Elastici"

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Manfroni, Michele. "Controllo del flusso termico in convezione mista tramite fluidi visco-elastici." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6107/.

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L'obiettivo del lavoro è stato quello di valutare l'influenza di fluidi viscoelastici sullo scambio termico in flussi in convezione mista, tramite l'analisi di simulazioni numeriche dirette del campo. Si è osservato che il numero di Nusselt aumenta se il numero di Deborah della soluzione cresce, ma l'incremento della componente di convezione forzata inibisce tale effetto positivo.
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Bertoni, Vanessa. "Analisi probabilistica e uso di controventi dissipativi in telai in accaio e composti acciaio - calcestruzzo." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4469.

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2009/2010
In questa tesi si indagano vari metodi per la protezione sismica delle strutture a partire da una corretta e realistica valutazione della loro risposta sismica attraverso un approccio probabilistico che tenga conto delle aleatorietà più significative. Se la risposta non soddisfa quanto atteso si può intervenire in vari modi come attraverso l’introduzione di controventi dissipativi. Si analizzano qui due tipologie: i controventi dotati di dispositivi visco elastici e quelli con dispositivi fluido viscosi. Di entrambi si presentano dei metodi di progetto completi con relativi confronti.
XXIII Ciclo
1977
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Bella, Maurizio. "Modellazione numerica di strutture sismoresistenti e analisi probabilistiche di tipo montecarlo." Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3460.

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2008/2009
Lo scopo della presente Tesi è lo sviluppo e la messa a punto di una serie di modelli numerici e codici di calcolo atti a modellare il comportamento di strutture sismoresistenti di tipo intelaiato sottoposte ad azione sismica al fine di poter effettuare una valutazione dell'affidabilità strutturale per mezzo di analisi probabilistiche di tipo Montecarlo. In particolare la modellazione dei giunti composti trave-colonna, è stata realizzata definendo un modello meccanico per componenti, atto a descrivere il comportamento del giunto modellato per mezzo di un insieme di elementi rigidi e deformabili, opportunamente connessi tra di loro e a cui sono stati assegnati opportuni modelli istertici. A tale scopo si è proceduto allo sviluppo ed implementazione all’interno del codice di calcolo ABAQUS e ADAPTIC di una serie di modelli isteretici reperiti in letteratura atti alla modellazione numerica delle principali componenti deformative individuabili nei giunti trave colonna e nei dispositivi viscoelastici utilizzati nella realizzazione di controventi dissipativi. Nello sviluppo del modello meccanico per la modellazione del comportamento dei giunti nodi trave colonna composti si è prestata particolare attenzione alla definizione degli elementi che descrivono l’interazione tra la soletta e la colonna. Per agevolare l’esecuzione dell’elevato numero di analisi numeriche richieste dalle analisi probabilistiche di tipo Montecarlo si è inoltre proceduto a sviluppare un pre-processore ed un post-processore in grado di interfacciarsi con i codici di calcolo utilizzati. Nel primo capitolo verrà introdotto il problema della valutazione dell'affidabilità delle strutture. Nel secondo capitolo verranno introdotti i metodi di analisi strutturale con particolare riferimento al metodo dell'analisi probabilistica di tipo montecarlo applicato alla valutazione dell'affidabilità delle strutture. Nel terzo capitolo si esaminerà la problematica della modellazione numerica delle strutture sismoresistenti. Nel quarto capitolo verranno illustrati i modelli numerici sviluppati e implementati nonchè i codici di calcolo sviluppati. Nel quinto capitolo verrà illustrato il processo di validazione dei modelli numerici sviluppati utilizzando i risultati forniti da una serie di indagini sperimentali condotte da vari autori e reperite in letteratura. Infine nel sesto capitolo si procederà alla valutazione dell'affidabilità strutturale di una struttura intelaiata campione. Più precisamente la struttura oggetto dell’indagine è il telaio testato nel European Laboratory for Structural Assessment (ELSA) del Joint Research Center (JRC) di Ispra (Varese). In particolare, per tale struttura verranno determinate le curve di fragilità con riferimento allo spostamento relativo di interpiano (IRDA) assunto come indice di danno strutturale.
XXII Ciclo
1979
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Whiting, Andrew Ivan Melville. "Localized buckling of an elastic strut in a visco-elastic medium." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/37110.

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Certain types of long, axially compressed structures have the potential to buckle locally in one or more regions rather than uniformly along their length. Here, the potential for localized buckle patterns in an elastic layer embedded in a visco-elastic medium is investigated using a strut-on-foundation model. Applications of this model include the growth of geological folds and other time-dependent instability processes. The model consists of an elastic strut of uniform flexural stiffness supported by a Winkler-type foundation made up of discrete Maxwell elements. Mathematically, this model corresponds to a nonlinear partial differential equation which is fourth-order in space and first-order in time. The nature of the buckling process is characterized by an initial period of elastic deformation followed by an evolutionary phase in which both elasticity and viscosity have a role to play. Two different formulations are studied: the first combines linear strut theory with a nonlinear foundation and is valid for small, but finite, deflections; the other incorporates the exact expression for curvature of the strut resulting in geometrical nonlinearities and is capable of modelling large deflections. The evolution of non-periodic buckle patterns in each system is examined under the constraint of controlled end displacement. Two independent methods are used to approximate the solution of the governing equations. Modal solutions, based on the method of weighted residuals, complement accurate numerical solutions obtained with a boundary-value solver. In either case, the results suggest that for the perfect system, localized solutions follow naturally from the inclusion of nonlinear elasticity with softening characteristics. Emphasis throughout is on the qualitative features displayed by the phenomenon of localization rather than specific applications. Nevertheless, the ideas and results are a step towards accounting for the rich variety of deformed shapes exhibited by nature.
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Sandin, Joakim. "Analysis Methods for Structures with Visco-Elastic Damping Treatment." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13250.

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During aircraft development, the impact of vibrations is examined and how this affects the aircraft structure under different conditions. Those vibrations can damage electronic equipment that are installed within the fuselage and can even lead to material fatigue within the structure. To reduce vibrations there are two approaches that are preferred to use, installing vibration insulators attached between the structure and the electrical component or change the design of the structure to a stiffer one. Those methods are easiest to implement in an early stage of the development but in later stages, when vibration problems usually are detected, it is too difficult and expensive to do major changes of the structure and there is lack of space to implement vibration insulators. A third method is then to apply passive damping in form of damper mats to surfaces on structures where critical vibrations occurs.    The effects on the structural behavior when damper mats are applied to a certain structure are studied in this thesis work. The purpose is to get deeper knowledge about how damper mats can be used to reduce vibrations in aircraft structures. The type of damper mat that is studied is known as Constrained Layer Damping, CLD, which is a sandwich of a visco-elastic material layer and a stiffer constraining material layer. Modelling and simulation methods that are based on commercial FE-software have been developed. The analysis method is based on doing a modal analysis with structural damping taken into account. This makes it possible to predict the overall global damping at each structural mode. The models for damper mats have in this project been verified with experimental testing using typical damper mats. The methodology can be used to predict the behavior of damped structures in order to obtain an effective and lightweight passive damping solution.
Under utvecklingen av flygplan undersöks hur vibrationer påverkar flygplansstrukturen under olika förutsättningar. Dessa vibrationer kan skada elektronisk utrustning som är monterad i flygplanskroppen och kan även göra så att materialutmattning uppstår i flygplansstrukturen. För att motverka vibrationer finns det två metoder som är att föredra, antingen att montera vibrationsisolatorer mellan de elektroniska utrustningarna och strukturen eller att ändra designen på strukturer till en styvare. Dessa metoder är enkla att implementera i ett tidigt steg i utvecklingsprocessen men i senare steg, då vibrationsproblem ofta upptäcks, så är det för komplicerat och för dyrt att göra större ändringar på strukturen och så är det ont om plats för att kunna installera vibrations isolatorer. En tredje metod är istället att implementera passiv dämpning i form av dämpningsmattor på ytor av strukturen där kritiska vibrationer uppstår. Effekterna av det strukturella uppförandet när dämpningsmattor är applicerade på en viss struktur har studerats i det här examensarbetet. Syftet är att få en fördjupad kunskap om hur dämpningsmattor kan användas för att reducera vibrationer i flygplan strukturer. Den typ av dämpningsmatta som har studerats är känd som Constrained Layer Damping, CLD, vilken är en sandwich av ett visko-elastiskt lager samt ett styvare lager.  Modellerings och simuleringsmetoder som är baserade på kommersiella FE-mjukvaror har utvecklats. Analysmetoderna är baserade på att utföra modalanalys tillsammans med strukturell dämpning. Detta möjliggör att förutse den övergripande dämpningen vid varje strukturell mod. Modellerna för dämpningsmattorna har i det här projektet verifierats med experimental testning av typiska dämpningsmattor. Metodiken kan användas till att prediktera beteendet av dämpade strukturer för att uppnå en effektiv och lättviktig passiv dämpningslösning.
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Matar, Ali. "The mechano sorptive creep of softwood in bending." Thesis, London South Bank University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288110.

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This PhD research project mainly examined the important yet incompletely understood field of the mechano-sorptive creep of softwood. It included the acquisition of accurate creep data during constant and cyclic moisture conditions. The study only concerns the loading of softwood in the longitudinal, parallel to the grain direction in bending mode. Mechano-sorptive creep deformation takes place when the wood is subjected to load in varying humidity conditions, where the creep deformation is substantially higher than the creep deformation under constant humidity conditions. Visco-elastic creep is defined as the creep strain that is primarily dependent on time. Further analysis on the pseudo-creep, which is reversible with moisture changes, was also investigated. The Young's Modulus (E) and density (p) of the samples used in this research were measured and the ratio of (E/p) was used to characterise the quality of the wood specimen. A program was written in Quick-Basic for the computer to take readings from the creep machines at all times during all creep tests for acquiring maximum creep data possible for obtaining better results. A 'steaming' technique was implemented to accelerate creep recovery, in order to allow the re-use of the same sample for repeated creep testing, so reducing the effects of variability. Measurements of visco-elastic creep, mechano-sorptive creep limit and pseudo-creep rate as functions of percentage relative humidity and E/p were investigated and analysed. The mechano-sorptive creep limit was successfully reached by the load-reduction method. The pseudo-creep rate was similar for samples with the same values of E/p at different relative humidity. The higher the relative humidity, the larger the magnitude of visco-elastic and the 'reference' creep at the mechano-sorptive creep limit. A higher value of E/p produced lower pseudocreep rate, visco-elastic creep and mechano-sorptive creep limit. Equations were derived from the one week visco-elastic creep experimental data in order to extrapolate visco-elastic creep to longer time durations, (medium, long and permanent periods, and compared to the new European code of practice for timber design, namely the Draft Eurocode 5), and at two critical relative humidity conditions, (63% and 90%rh), which correspond to the Service Classes 1 and 2 in the Draft Eurocode 5. Also, an equation to predict the mechano-sorptive creep limit at various values of E/p for the two critical relative humidity conditions, (63% and 90%rh), was acquired. The prediction of creep at various relative humidities along the pseudo creep line was also quantified. The extrapolated visco-elastic creep along with the total upper-bound creep values were compared to the creep allowances of the Draft Eurocode 5 for both Service Classes 1 and 2. Moreover, a design scheme for estimating the upper-bound creep, consisting of the addition of visco-elastic, mechano-sorptive and pseudo creep for Draft Eurocode 5 Service Classes 1 and 2 was achieved. A study of the degree of interaction between visco-elastic and mechanosorptive creep was further investigated. Two different experiments were performed to reach some conclusion. The results of the first experiment showed that mechanosorptive creep acceleration decreases the visco-elastic creep rate and there was some kind of interaction between the two creep mechanisms. Hence the two creep mechanisms should not be considered as a separate phenomenon. On the other hand, the results of the second experiment showed that the visco-elastic and mechanosorptive creep are not a single process but are related processes. Moreover, it was deduced that the mechano-sorptive creep does not depend on the accumulation of the visco-elastic creep rate.
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Brunetti, Carlotta. "Frequency-dependent response of snow in uniaxial compression and comparison with numerical simulation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7820/.

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La determinazione del modulo di Young è fondamentale nello studio della propagazione di fratture prima del rilascio di una valanga e per lo sviluppo di affidabili modelli di stabilità della neve. Il confronto tra simulazioni numeriche del modulo di Young e i valori sperimentali mostra che questi ultimi sono tre ordini di grandezza inferiori a quelli simulati (Reuter et al. 2013)⁠. Lo scopo di questo lavoro è stimare il modulo di elasticità studiando la dipendenza dalla frequenza della risposta di diversi tipi di neve a bassa densità, 140-280 kg m-3. Ciò è stato fatto applicando una compressione dinamica uniassiale a -15°C nel range 1-250 Hz utilizzando il Young's modulus device (YMD), prototipo di cycling loading device progettato all'Istituto per lo studio della neve e delle valanghe (SLF). Una risposta viscoelastica della neve è stata identificata a tutte le frequenze considerate, la teoria della viscoelasticità è stata applicata assumendo valida l'ipotesi di risposta lineare della neve. Il valore dello storage modulus, E', a 100 Hz è stato identificato come ragionevolmente rappresentativo del modulo di Young di ciascun campione neve. Il comportamento viscoso è stato valutato considerando la loss tangent e la viscosità ricavata dai modelli di Voigt e Maxwell. Il passaggio da un comportamento più viscoso ad uno più elastico è stato trovato a 40 Hz (~1.1•10-2 s-1). Il maggior contributo alla dissipazione è nel range 1-10 Hz. Infine, le simulazioni numeriche del modulo di Young sono state ottenute nello stesso modo di Reuter et al.. La differenza tra le simulazioni ed i valori sperimentali di E' sono, al massimo, di un fattore 5; invece, in Reuter et al.⁠, era di 3 ordini di grandezza. Pertanto, i nostri valori sperimentali e numerici corrispondono meglio, indicando che il metodo qui utilizzato ha portato ad un miglioramento significativo.
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Thrower, Edward Neal. "Permanent deformation of flexible road pavements by visco-elastic analysis." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37877.

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Garnier, Erell-Isis. "Long waves in water over a visco-elastic muddy seabed." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67613.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 289-290).
The propagation of surface waves over a flat muddy seabed are studied. Mud is first considered as a Newtonian fluid. Water and mud equations are derived in order to obtain governing equation for surface and interface waves. By the method of multiple scales. nonlinear evolution equations are derived for the harmonic amplitudes. These equations are numerically solved for a finite number of harmonics to show the behavior of surface and interface motions. A drift current in mud is found at the second order., meaning that surface waves induce mud motion. Equation governing the total wave energy variation is derived and used to verify the accuracy of numerical solutions. The model is extended to viscoelastic mud, using the results of four experiments carried on different types of muds. These muds range from very elastic to rather viscous, allowing us to compare hie differences in behavior. Surface and interface variations. mud drift current and energy variations are plotted and compared to the results with Newtonian muds. A sloping muddy seabed is then considered. Mud is modeled as viscoelastic to avoid a constant static current that would happen with Newtonian mud. By the method of multiple scales and by introducing a space-dependent wavenumber, mud drift current and energy variation equations are derived again, taking into account the effect of the slope. An analytic stud v of the surface variations demonstrates that surface and interface waves, as well as drift current, exponentially decay to reach a zero value at the shore.
by Erell-Isis Garnier.
S.M.
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10

Nicely, Clinton R. "Transverse Vibrations of Multi-Walled Nanotubes with Visco-Elastic Layers." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1227460546.

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Books on the topic "Visco Elastici"

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Tidal deformations on a rotating, spherically asymmetric, visco-elastic, and laterally heterogeneous earth. Frankfurt am Maim: P. Lang, 1991.

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Qin, Yuming, and Zhiyong Ma. Global Well-posedness and Asymptotic Behavior of the Solutions to Non-classical Thermo(visco)elastic Models. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1714-8.

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Tezcan, Semih S. Reduction of seismic response by viscoelastic dampers =: Binaların sismik davranışlarının visko elastik sönüm cihazları ile düşürülmesi. Maslak, İstanbul: Turkish Earthquake Foundation, 2000.

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Can, Nguyen Van. Rozkład napre̜żeń i odkształceń w górotworze lepkospre̜żystym, wywołany obcia̜żeniem dynamicznym: Distributions of stresses and strains in the visco-elastic rock mass caused by the dynamic loading. Kraków: Wydawnictwo AGH, 1990.

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Ricker, Norman. Transient Waves in Visco-Elastic Media. Elsevier, 2012.

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Bartenev, G. M., and Yu S. Zuyev. Strength and Failure of Visco-Elastic Materials. Elsevier Science & Technology Books, 2013.

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National Aeronautics and Space Administration (NASA) Staff. Nonlinear Visco-Elastic Response of Composites Via Micro-Mechanical Models. Independently Published, 2018.

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With, Gijsbertus de. Structure, Deformation, and Integrity of Materials: Volume I: Fundamentals and Elasticity / Volume II: Plasticity, Visco-elasticity, and Fracture. Wiley-VCH, 2006.

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Ma, Zhiyong, and Yuming Qin. Global Well-Posedness and Asymptotic Behavior of the Solutions to Non-classical Thermo(visco)elastic Models. Springer London, Limited, 2016.

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Book chapters on the topic "Visco Elastici"

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Seifert, Christian, Sascha Trostorff, and Marcus Waurick. "Examples of Evolutionary Equations." In Evolutionary Equations, 103–17. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89397-2_7.

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AbstractThis chapter is devoted to a small tour through a variety of evolutionary equations. More precisely, we shall look into the equations of poro-elastic media, (time-)fractional elasticity, thermodynamic media with delay as well as visco-elastic media. The discussion of these examples will be similar to that of the examples in the previous chapter in the sense that we shall present the equations first, reformulate them suitably and then apply the solution theory to them. The study of visco-elastic media within the framework of partial integro-differential equations will be carried out in the exercises section.
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Steinmann, Paul, and Kenneth Runesson. "Visco-Elasticity." In The Catalogue of Computational Material Models, 77–191. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63684-5_4.

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Fichtner, Andreas. "Visco-elastic Dissipation." In Full Seismic Waveform Modelling and Inversion, 83–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15807-0_5.

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Fuss, Franz Konstantin. "Nonlinear Visco-Elastic Materials." In Nonlinear Approaches in Engineering Applications, 135–70. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-1469-8_5.

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Irving, A. D., B. R. Clayton, and T. Dewson. "Nonlinear Thermo-Visco-Elastic Behaviour." In Solid Mechanics and Its Applications, 127–32. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8494-4_18.

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Di Paola, Mario, and Antonina Pirrotta. "Fractional Calculus in Visco-Elasticity." In 50+ Years of AIMETA, 261–72. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94195-6_16.

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Billon, Noëlle. "New Thermo-Mechanical Modelling for Visco Elastic, Visco Plastic Polymers." In Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2, 75–81. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4241-7_11.

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Leeman, S., and J. Jones. "Visco-Elastic Models for Soft Tissues." In Acoustical Imaging, 369–76. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8823-0_51.

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She, Z. S., U. Frisch, and O. Thual. "Homogenization and visco-elasticity of turbulence." In Macroscopic Modelling of Turbulent Flows, 1–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15644-5_1.

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Abed-Meraim, F., and Q. S. Nguyen. "Stability of a Quasi-Static Evolution of a Visco-Elastic, Visco-Plastic or Elastic-Plastic Solid." In Nonconvex Optimization and Its Applications, 1–14. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4613-0275-9_1.

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Conference papers on the topic "Visco Elastici"

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Zhao, Q., C. Zhu, and Z. Wei. "Visco-Elastic Reverse Time Migration Using Decoupled Fractional Visco-Elastic Propagator." In 83rd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2022. http://dx.doi.org/10.3997/2214-4609.202210761.

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Hormozi, S., D. M. Martinez, I. A. Frigaard, and D. Grecov. "Experimental Studies of Visco-Elastic Flow Using Visco-Plastic Lubricant." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37940.

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Multi-layer shear flows of viscous fluids are frequently vulnerable to interfacial instabilities. In the case of a duct flow, it is known that use of a yield stress fluid as the lubricating fluid, coupled with maintaining a plug region at the interface, can lead to flows that are hydrodynamically stable: linearly and nonlinearly, both theoretically and in laboratory experimental studies; see [1],[2], and [3]. Whether the same technique is effective in stabilizing multi-layer duct flows with a visco-elastic core fluid is unknown and also relevant to many potential applications. In this paper we provide an experimental study by using viscoelastic fluid (Polyethylene Oxide solution) in the core region and visco-plastic fluid (Carbopol Solution) with yield stress as lubricant. The experiments have been carried out in axisymmetric configuration with different size of inner pipes. Via control of the individual fluid flow rates, it is also possible to vary the inner fluid radius over a significant range, which suggests utility for various industrial processes.
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Trcala, Miroslav, Ivan Němec, and Adéla Vaněčkova. "Visco-elastic-visco-plastic/damage material models for transient dynamic loading." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0028436.

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Kadıoğlu, Fethi, and Gülçin Tekin. "Dynamic response of visco-elastic plates." In INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2016 (ICCMSE 2016). Author(s), 2016. http://dx.doi.org/10.1063/1.4968756.

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Forjaz, Maria Antónia, António Mário Almeida, T. de Lacerda–Arôso, and Jorge Pamplona. "Special matrices for visco-elastic systems." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2015 (ICNAAM 2015). Author(s), 2016. http://dx.doi.org/10.1063/1.4952095.

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Dongmo, B. F. "A 3D visco-elasto-plasto damage constitutive model of concrete under long-term effects." In AIMETA 2022. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902431-6.

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Abstract. A comprehensive 3D visco-elasto-plasto-damage constitutive model of concrete is proposed to analyze its behaviour under long-term and cyclic loadings. This model combines the visco-elasticy and plasticity theories together with damage mechanics. The work aims at providing an efficient model capable of predicting the material behaviour, taking into account time-dependent effects at the mesoscale. The visco-elastic part is modeled within the framework of the linear visco-elasticity theory. The creep function is evaluated with the aid of the B3 model by Bažant and Baweja, and implemented via the exponential algorithm. The modified Menétrey-Willam pressure-dependent yield surface, and a non-associated flow rule are used for the plastic formulation of the model. The damage part of the model considers two exponential damage parameters: one in tension, and one in compression, that account for a realistic description of the transition from tensile to compressive failure. After discussing the numerical implementation, the proposed model is calibrated, and numerical results at the mesoscale level are compared to experimental results.
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Xu, Wei, Haiwu Rong, and Tong Fang. "Visco-Elastic Systems Under Narrow-Band Excitation." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21654.

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Abstract The study of the response of nonlinear systems to narrow-band random excitation is importance. For example, the excitation of secondary system would be a narrow-band random process if the primary system could be modeled as a single -degree-of-freedom system with light damping subject to borad-band excitation. In the theory of nonlinear random vibration, most results obtained so far are attributed to the response of nonlinear oscillators to borad-band random excitation. In comparison, results on the effect of narrow-band excitation on non-linear oscillators are quite limited. Furthermore, some results in this area are disputable. For linear viscoelastic systems under both additive and multiplicative borad-band excitation excitations, Ariaratnam studied the stochastic stability of the system by using the method of stochastic averaging. Cai, Lin and Xu determined the condition for asymptotic sample stability of the system by using an improved stochastic averging procedure. In this paper, the response of visco-elastic systems to combined deterministic harmonic and random excitation is investigated. The method of harmonic balance and the method of stochastic averaging are used to determine the response of the system. Theoretical analyses and numerical simulations show that when the intensity of the random excitation increase, the steady state solution may change form a limit cycle to a diffused limit cycle. Under some conditions the system may have two steady state solutions and jumps may exist.
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Kulicke, Werner-Michael, Fabian Meyer, Ali Ö Bingöl, Derek Lohmann, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "Visco-Elastic Properties of Sodium Hyaluronate Solutions." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964773.

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Eckert, Andreas, Davi R. Damasceno, and Xiaolong Liu. "FLEXURAL-SLIP DURING VISCO-ELASTIC BUCKLE FOLDING." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-278640.

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Ober, Curtis, Thomas Smith, James Overfelt, S. Collis, Gregory Von Winckel, Bart Van Bloemen Waanders, Nathan Downey, et al. "Visco-TTI-elastic FWI using discontinuous Galerkin." In SEG Technical Program Expanded Abstracts 2016. Society of Exploration Geophysicists, 2016. http://dx.doi.org/10.1190/segam2016-13847188.1.

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Reports on the topic "Visco Elastici"

1

Mills, Katie, Johsan Billingham, Simon Choppin, Simon Goodwill, and Marcus Dunn. Constant Parameter Visco-elastic Model of a Normal Incidence Football Impact. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317487.

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