Exploració per tema "Viscoelasticity"

Ara es mostren els items 21-40 de 56

    • Experimental observation of the origin and structure of elastoinertial turbulence 

      Choueiri, George; López Alonso, José Manuel; Varshney, Atul; Sankar, Sarath; Hof, Björn (2021-11-09)
      Article
      Accés obert
      Turbulence generally arises in shear flows if velocities and hence, inertial forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit disordered motion even at vanishing inertia. Intermediate ...

    • Exponential decay in one-dimensional type II thermoviscoelasticity with voids 

      Miranville, Alain; Quintanilla de Latorre, Ramón (2020-04)
      Article
      Accés obert
      In this paper we consider the one-dimensional type II thermoviscoelastic theory with voids. We prove that generically we have exponential stability of the solutions. This is a striking fact if one compares it with the ...

    • Exponential decay in one-dimensional Type II/III thermoelasticity with two porosities 

      Magaña Nieto, Antonio; Quintanilla de Latorre, Ramón (2020-07-30)
      Article
      Accés obert
      In this paper we consider the theory of thermoelasticity with a double porosity structure in the context of the Green-Naghdi types II and III heat conduction models. For the type II, the problem is given by four hyperbolic ...

    • Identification des paramètres de différents modèles de comportement élastoviscoplastique 

      Alsina Viladecans, Mireia (Universitat Politècnica de Catalunya / Institut National des Sciences Appliquées de Lyon, 2013)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Institut national des sciences appliquées de Lyon
      Ce stage a pour but l’identification des paramètres de différents modèles de comportement mécanique pour l’alliage d’aluminium utilisé pour le carter-cylindre. Lors de la fabrication et l’assemblage du carter-cylindre ainsi ...

    • Investigation of the viscoelastic flow behavior of polymer melts 

      Monserrate Sabadell, Víctor (2013-07)
      Projecte/Treball Final de Carrera
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Hochschule Darmstadt
      This bachelor thesis does a theoretic approach to the basics of Viscosity, Fluids, Plastics, Polymers, Rheology and Rheometry before explaining, defining and studying the results of the carried out measurement ...

    • Mechanical behavior of blood vessels: elastic and viscoelastic contributions 

      Sánchez Molina, David; García Vilana, Silvia; Llumà Fuentes, Jordi; Galtés Vicente, Ignasi; Velázquez Ameijide, Juan; Rebollo-Soria, M. Carmen; Arregui Dalmases, Carlos (2021-08-26)
      Article
      Accés obert
      The mechanical properties of the cerebral bridging veins (CBVs) were studied using advanced microtensile equipment. Detailed high-quality curves were obtained at different strain rates, showing a clearly nonlinear stress–strain ...

    • Mechanical oscillations in biological tissues as a result of delayed rest-length changes 

      Muñoz Romero, José; Dingle, Monica; Wenzel, Manuel (American Institute of Physics (AIP), 2018-11-26)
      Article
      Accés obert
      Oscillatory behavior in tissue biology is ubiquitous and may be observed in the form of either chemical or mechanical signals. We present here and solve a mechanical cell model that exhibits oscillations emerging from ...

    • Mechanochemical pattern formation in simple models of active viscoelastic fluids and solids 

      Alonso Muñoz, Sergio; Radszuweit, Markus; Engel, Harald; Baer, Markus (Institute of Physics (IOP), 2017-11-01)
      Article
      Accés obert
      The cytoskeleton of the organism Physarum polycephalum is a prominent example of a complex active viscoelastic material wherein stresses induce flows along the organism as a result of the action of molecular motors and ...

    • Modeling the porous and viscous responses of human brain tissue behavior 

      Comellas Sanfeliu, Ester; Budday, Silvia; Pelteret, Jean-Paul; Holzapfel, Gerhard A.; Steinmann, Paul (2020-09-01)
      Article
      Accés obert
      The biomechanical characterization of human brain tissue and the development of appropriate mechanical models is crucial to provide realistic computational predictions that can assist personalized treatment of neurological ...

    • Modelling of non-linear viscoelastic tissues with bar elements 

      Asadipour, Nina (Universitat Politècnica de Catalunya, 2012-03)
      Projecte Final de Màster Oficial
      Accés obert
      In this work we develop a viscoelastic bar element that can handle multiple rheological laws with non-linear elastic and non-linear viscous material models. The bar element is built by joining in series an elastic and ...

    • Modelling time-dependent plastic behaviour of geomaterials 

      Song, Fei (Universitat Politècnica de Catalunya, 2021-06-28)
      Tesi
      Accés obert
      Representing the time-dependent plastic behaviour of geomaterials is a critical issue in the correct application of tunnelling design techniques such as the convergence-confinement method or numerical modelling. Furthermore, ...

    • Numerical analysis of a problem involving a viscoelastic body with double porosity 

      Bazarra, Noelia; Fernández, Jose R.; Leseduarte Milán, María Carme; Magaña Nieto, Antonio; Quintanilla de Latorre, Ramón (2022-02)
      Article
      Accés restringit per política de l'editorial
      We study from a numerical point of view a multidimensional problem involving a vis- coelastic body with two porous structures. The mechanical problem leads to a linear system of three coupled hyperbolic partial differential ...

    • Numerical Analysis of Viscoelastic Fluid Injection Processes 

      Amani, Ahmad; Schillaci, Eugenio; Kizildag, Deniz; Pérez Segarra, Carlos David (2021)
      Text en actes de congrés
      Accés obert
      In this work, a numerical framework aimed at simulating high-viscous and viscoelastic liquid injection processes is presented. The study of fluid injection with viscoelastic properties, such as synthetic polymers, is of ...

    • Numerical simulation of non-isothermal viscoelastic fluid flows using a VMS stabilized finite element formulation 

      Moreno Martínez, Laura; Codina, Ramon; Baiges Aznar, Joan (2021-10)
      Article
      Accés obert
      The effect of temperature in viscoelastic fluid flows is studied applying a stabilized finite element formulation based on both a standard and a log-conformation reformulation (LCR), and the Variational Multiscale (VMS) ...

    • Numerical simulations of particle suspensions in confined geometries 

      Umbert López, Cyan (Universitat Politècnica de Catalunya / Kungliga Tekniska Högskolan, 2013)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Kungliga Tekniska högskolan
      Particle suspensions are ubiquitous in industry and natural phenomena. With the rapid development of micro-devices it becomes increasingly important to understand the behavior of owing particle suspensions in confined ...

    • On a mixture of an MGT viscous material and an elastic solid 

      Fernández, Jose R.; Quintanilla de Latorre, Ramón (2022-01)
      Article
      Accés obert
      A lot of attention has been paid recently to the study of mixtures and also to the Moore–Gibson–Thompson (MGT) type equations or systems. In fact, the MGT proposition can be used to describe viscoelastic materials. In this ...

    • On the analyticity of the MGT-viscoelastic plate with heat conduction 

      Conti, Monica; Pata, Vittorino; Pellicer, Marta; Quintanilla de Latorre, Ramón (2020-10)
      Article
      Accés obert
      We consider a viscoelastic plate equation of Moore-Gibson-Thompson type coupled with two different kinds of thermal laws, namely, the usual Fourier one and the heat conduction law of type III. In both cases, the resulting ...

    • On the numerical approximation of a problem involving a mixture of a MGT viscous material and an elastic solid 

      Bazarra, Noelia; Fernández, Jose R.; Quintanilla de Latorre, Ramón (2022-03)
      Article
      Accés obert
      In this work, we analyze, from the numerical point of view, a problem including a mixture made of a MGT viscoelastic solid and an elastic solid. The corresponding variational problem is a linear system composed of two ...

    • On the uniqueness and analyticity in viscoelasticity with double porosity 

      Bazarra, Noelia; Fernández, José Ramón; Leseduarte Milán, María Carme; Magaña Nieto, Antonio; Quintanilla de Latorre, Ramón (2019-04-01)
      Article
      Accés obert
      In this paper we analyze the system of equations that models the behaviour of materials with a double porous structure. We introduce dissipation mechanisms in both structures. We show existence, uniqueness and analyticity ...

    • Participación del detrusor en las propiedades dinámicas de la pared vesical. Presentación de un nuevo modelo biomecánico 

      Virseda Chamorro, M.; Salinas Casado, J. (Sociedad Ibérica de Biomecánica y Biomateriales, 1996)
      Article
      Accés obert
      Se realizó un estudio experimental en orden a valorar la participación del detrusor en la acomodación y biomecánica de la pared vesical. Se utilizaron 65 perros machos adultos mestizos. Los animales fueron divididos en ...