Search for dissertations about: "Material-forces"

Showing result 1 - 5 of 11 swedish dissertations containing the word Material-forces.

  2. 1. On the Modelling of Fracture Using Strong Discontinuities

    Author : Martin Fagerström; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fracture; strong discontinuity; material forces; finite deformations; FEM;

    Abstract : The major concern of this work is the constitutive and numerical modelling of fracture,based on strong discontinuity formulations. More particularly, an extended finiteelement approach is used, where the total displacement is separated in two mutuallyindependent fields, representing the continuous and discontinuous displacement respectively. READ MORE

  4. 2. Elastic-Plastic Fracture Mechanics and RCF in Rails

    Author : Johan Tillberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RCF; elastic-plastic fracture mechanics; Material-forces; Multiple crack interaction;

    Abstract : This thesis concerns issues regarding the modeling and numerical simulation of singularcracks and their propagation in the context of Rolling Contact Fatigue (RCF) in rails.Typically, such cracks are associated with squats and head-checks in the rail head. READ MORE

  5. 3. Numerical simulation of crack growth and wear in rails

    Author : Jim Brouzoulis; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; crack propagation; material forces; Rolling Contact Fatigue; wear; railway mechanics;

    Abstract : Wear and rolling contact fatigue (RCF) of rails are huge problems for the railway industry with increased world-wide occurrence during the last decades. It is, therefore, of high interest to develop tools for the prediction of wear and RCF which can be used to estimate rail life. READ MORE

  6. 4. On the modeling of anisotropy in pearlitic steel subjected to rolling contact fatigue

    Author : NASIM LARIJANI; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rolling Contact Fatigue; crack propagation; Anisotropy; plasticity; pearlitic steel; material forces;

    Abstract : One of the main sources of damage caused by Rolling Contact Fatigue (RCF) inrailway components is the large plastic deformations that accumulate in the surface layerof these components. Large plastic deformations in components made of pearlitic steelinduce anisotropy in the mechanical properties of the material. READ MORE

  7. 5. Elastic-plastic fracture mechanics - Application to rolling contact fatigue in rails

    Author : Johan Tillberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; rolling contact fatigue; railway mechanics; Elastic-plastic fracture mechanics; material forces;

    Abstract : Railway structures represent complex mechanical problems involving wave propagation, plastic deformations and material degradation. The wheel-rail contact loads subject the material to repeated cycles of complex stress states resulting in rolling contact fatigue (RCF). READ MORE