Sökning: "representative volume element"

Visar resultat 1 - 5 av 32 avhandlingar innehållade orden representative volume element.

  1. 1. Failure mechanisms in continuous fiber systems

    Författare :Jonas Neumeister; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; volume dependence; representative volume element; stress recovery; creep rupture; fiber fragmentation; tensile and flexural strength; brittle matrix composite; damage; fiber bundle; bundle pullout; failure propagation time; incubation time;

    Sammanfattning : .... LÄS MER

  3. 2. Determination of equivalent hydraulic and mechanical properties of fractured rock masses using the distinct element method

    Författare :Ki-Bok Min; KTH; []
    Nyckelord :equivalent continuum approach; equivalent property; representative elementary volume; distinct element method;

    Sammanfattning : The equivalent continuum approach uses equivalent propertiesof rock mass as the input data for a continuum analysis. Thisis a common modeling method used in the field of rock mechanicsand hydrogeology. LÄS MER

  4. 3. Meso-Mechanical Modeling and Analysis of Adhesive Layers

    Författare :Kent Salomonsson; Ulf Stigh; Per Ståhle; Högskolan i Skövde; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Adhesive layer; Meso-mechanical; Representative Volume Element; Large curvatures; Interphase elements; Evolution algorithm; Engineering mechanics; Teknisk mekanik; Technology; Teknik;

    Sammanfattning : This thesis is concerned with the modeling, simulation and analysis of adhesive layers. By use of an in situ scanning electron microscopy study it is found that the adhesive studied in the present thesis has a very complex structure with two different compounds, a mineral and an epoxy/thermoplastic blend. LÄS MER

  5. 4. Microstructural finite element modeling of metals

    Författare :Mikael Nygårds; KTH; []
    Nyckelord :;

    Sammanfattning : The mechanical properties of metals have been investigated.This has been done by creating micromechanical models based onthe microstructural data available for the materials ofinterest. Thus, models containing a grain structure withappropriate constitutive equations have been created. LÄS MER

  7. 5. Strength and deformability of fractured rocks

    Författare :Majid Noorian-Bidgoli; Lanru Jing; John A. Hudson; KTH; []
    Nyckelord :Fractured crystalline rocks; Numerical experiments; Discrete element methods DEM ; Discrete fracture network DFN ; Representative elementary volume REV ; Coupled hydro-mechanical processes; Anisotropy; Effective stress; Failure criteria; Stochastic realizations; Land and Water Resources Engineering; Mark- och vattenteknik;

    Sammanfattning : This thesis presents a systematic numerical modeling framework to simulate the stress-deformation and coupled stress-deformation-flow processes by performing uniaxial and biaxial compressive tests on fractured rock models with considering the effects of different loading conditions, different loading directions (anisotropy), and coupled hydro-mechanical processes for evaluating strength and deformability behavior of fractured rocks. By using code UDEC of discrete element method (DEM), a series of numerical experiments were conducted on discrete fracture network models (DFN) at an established representative elementary volume (REV), based on realistic geometrical and mechanical data of fracture systems from field mapping at Sellafield, UK. LÄS MER