Search for dissertations about: "viscoelasticity"

Showing result 1 - 5 of 59 swedish dissertations containing the word viscoelasticity.

  1. 1. The Finite Element Method for Fractional Order Viscoelasticity and the Stochastic Wave Equation

    University dissertation from Göteborg : Chalmers University of Technology and University of Gothenburg

    Author : Fardin Saedpanah; Göteborgs universitet.; Gothenburg University.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite element method; continuous Galerkin method; linear viscoelasticity; fractional calculus; fractional order viscoelasticity; weakly singular kernel; stability; a priori error estimate; a posteriori error estimate; stochastic wave equation; additive noise; Wiener process; strong convergence.;

    Abstract : This thesis can be considered as two parts. In the first part a hyperbolic type integro-differential equation with weakly singular kernel is considered, which is a model for dynamic fractional order viscoelasticity. In the second part, the finite element approximation of the linear stochastic wave equation is studied. READ MORE

  2. 2. Mechanistic-Empirical Modelling of Flexible Pavement Performance Verifications Using APT Measurements

    University dissertation from Stockholm : US-AB

    Author : Abubeker Worake Ahmed; KTH.; Statens väg- och transportforskningsinstitut.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transportvetenskap; Transport Science; Civil and Architectural Engineering; Byggvetenskap; Flexible Pavement; Pavement Performance Models; Multilayer Elastic Theory; Linear Viscoelasticity; Rutting; Accelerated Pavement Testing; Heavy Vehicle Simulator; Road: Pavement design; Road: Pavement design; Performance; Deformation; Model not math ; Rutting wheel ; Viscoelasticity; Elasticity; Axle load; Flexible pavement; Laboratory not an organization ; Test; Thesis; Heavy vehicle simulator; Wheel tracking test;

    Abstract : Mechanistic-Empirical  (M-E)  pavement  design  procedures  are  composed  of  a  reliable  response model to estimate the state of stress in the pavement and distress models in order to predict the different types of pavement distresses due to the prevailing traffic and environmental conditions. One of the main objectives of this study was to develop a response model based on multilayer elastic  theory   (MLET)  with  improved  computational  performance  by   optimizing  the   time consuming parts of the MLET processes. READ MORE

  3. 3. On the compression properties of paper - implications for calendering

    University dissertation from Institutionen för pappers- och massateknologi

    Author : Peter Rättö; KTH.; [2001]
    Keywords : calendering; compression; creep; density; finite element analysis; heat transfer coefficient; mechanical properties; temperature; thermal conductivity; viscoelasticity; z-direction;

    Abstract : The objective of this work was to study and describe thedeformation of paper in the thickness direction in a calendernip that in some cases was heated. The temperature distributionin the thickness direction was evaluated using modelexperiments. READ MORE

  4. 4. Nanomechanical Phenomena in Low-Dimensional Structures

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Anton Vikström; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; superconductivity; acoustic sensors; heat flow; NEMS; surface acoustic waves; solitons; viscoelasticity; electronic edge states;

    Abstract : This is a compilation thesis which investigates various mechanical phenomena in different low-dimensional nanoscale systems. In the first part, we consider a purely mechanical phenomenon: the sensitivity of the dispersion of a Love-type surface acoustic wave (SAW) to geometry and material parameters. READ MORE

  5. 5. Capillarity and wetting of non-Newtonian droplets

    University dissertation from KTH Royal Institute of Technology

    Author : Yuli Wang; KTH.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dynamic wetting; contact line; diffusive interface; viscoelasticity; non-Newtonian; microfluidics; droplet impact; droplet spreading; Teknisk mekanik; Engineering Mechanics;

    Abstract : Capillarity and dynamic wetting of non-Newtonian fluids are important in many natural and industrial processes, examples cover from a daily phenomenon as splashing of a cup of yogurt to advanced technologies such as additive manufacturing. The applicable non-Newtonian fluids are usually viscoelastic compounds of polymers and solvents. READ MORE