Sökning: "Constitutive modelling"

Visar resultat 31 - 35 av 135 avhandlingar innehållade orden Constitutive modelling.

  1. 31. Stainless steel plasticity : material modelling and structural applications

    Författare :Anders Olsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel Structures; Stålbyggnad;

    Sammanfattning : The thesis addresses stainless steel in construction with focus on plasticity and shear resistance of welded girders respectively. In the area of plasticity it comprises an account of an experimental study with emphasis on phenomenological observations followed by theorethical modelling. LÄS MER

  3. 32. Multiscale Modelling of Reinforced Concrete

    Författare :Adam Sciegaj; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multiscale; bond-slip; cracking; computational homogenisation; reinforced concrete;

    Sammanfattning : Since concrete cracks at relatively low tensile stresses, the durability of reinforced concrete structures is highly influenced by its brittle nature. Cracks open up for ingress of harmful substances, e.g. chlorides, which in turn cause corrosion of the reinforcement. LÄS MER

  4. 33. Efficient thermomechanical modelling of welding

    Författare :Lars Wikander; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Datorstödd maskinkonstruktion; Computer Aided Design;

    Sammanfattning : This thesis deals with the pursuit of simple and efficient models for the prediction of welding residual deformation and stress, in particular ways to reduce the computational effort spent on the analysis. In the first part of the thesis, finite element models which reduce the number of degrees of freedom and thereby the execution time are presented. LÄS MER

  5. 34. Nonlinear micromechanics of open-cell cellular solids

    Författare :Per Hård af Segerstad; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; Finite strains; Foams; Micropolar theory; Constitutive modelling;

    Sammanfattning : An approach for modelling the response of open-cell cellular solids at finite strainsis developed. The model framework comprises a mechanistic formulation wherethe cellular solid is considered as a network of struts, each connecting two vertexpoints. LÄS MER

  7. 35. Railway Wheel Flats. Martensite Formation, Residual Stresses, and Crack Propagation

    Författare :Johan Jergeus; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sliding contact; metallographic investigation; crack propagation; thermal shock; constitutive modelling; phase transformations; railway wheel flats; full-scale field experiments; transformation plasticity; tread damage; residual stresses; spalling; martensite formation;

    Sammanfattning : A railway wheel flat is a flat spot on the rolling surface of a wheel caused by its unintentional sliding on the rail. The reason for the sliding may be poorly adjusted, frozen or defect brakes, or too high braking forces in relation to the available wheel/rail adhesion. LÄS MER