Sökning: "the finite element method"

Visar resultat 1 - 5 av 728 avhandlingar innehållade orden the finite element method.

  1. 1. The material distribution method analysis and acoustics applications

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Fotios Kasolis; Martin Berggren; Volker Schulz; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material distribution method; fictitious domain method; finite element method; Helmholtz equation; linear elasticity; shape optimization; topology optimization;

    Sammanfattning : For the purpose of numerically simulating continuum mechanical structures, different types of material may be represented by the extreme values {,1}, where 0<1, of a varying coefficient in the governing equations. The paramter is not allowed to vanish in order for the equations to be solvable, which means that the exact conditions are approximated. LÄS MER

  2. 2. On failure modelling in finite element analysis material imperfections and element erosion

    Detta är en avhandling från Institutionen för konstruktions- och produktionsteknik

    Författare :Mattias Unosson; Larsgunnar Nilsson; Kjell Simonsson; Lars Olovsson; Anders Eriksson; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; finite element method; element erosion; material failure; material imperfections; crack-tip; TECHNOLOGY Engineering mechanics Solid mechanics; TEKNIKVETENSKAP Teknisk mekanik Fastkroppsmekanik;

    Sammanfattning : This dissertation concerns failure modelling with material imperfections and element erosion in finite element analyses. The aim has been to improve the element erosion technique, which is simple to use and implement and also computationally inexpensive. LÄS MER

  3. 3. Modelling Alternative Load Paths in Platform-Framed CLT Buildings A Finite Element Approach

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Johannes Albert Josef Huber; Mats Ekevad; Ulf Arne Girhammar; Sven Berg; Sigurdur Ormarsson; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; timber; robustness; finite element method; alternative load paths; disproportionate collapse; Träteknik; Wood Science and Engineering;

    Sammanfattning : Timber has become more popular as a construction material during recent years. Engineered wood products, such as glued laminated timber and cross-laminated timber, have enabled the construction of multi-storey buildings. Tall buildings with many occupants need to resist a disproportional collapse in case of unexpected exposures, e.g. LÄS MER

  4. 4. Fatigue evaluation of welded details – using the finite element method

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Mustafa Aygül; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; the finite element method; welded details; effective notch stress method; Hot-spot stress method; fracture mechanics;

    Sammanfattning : The fatigue evaluation of welded details is generally based on the notion of nominal stress, using the classified S-N curves with corresponding fatigue classes for typical details. An approach of this kind should be used with extra caution to ensure that the load effects for components are accurately captured, because an ever-increasing number of welded details are resulting in a limited number of possible treatable design cases. LÄS MER

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

    Detta är en avhandling från Göteborg : Chalmers University of Technology and University of Gothenburg

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

    Sammanfattning : 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. LÄS MER