Sökning: "wheel flats"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden wheel flats.

  1. 1. Out-of-Round Railway Wheels - Literature Survey, Field Tests and Numerical Simulations

    Författare :Anders Johansson; Chalmers University of Technology; []
    Nyckelord :impact loads; wheel out-of-roundness; FASTSIM; wheel removal criteria; full-scale measurements; impact load detectors; dynamic train-track interaction; wheel polygonalization; wheel flats; wear modelling;

    Sammanfattning : .... LÄS MER

  3. 2. Railway Wheel Flats. Martensite Formation, Residual Stresses, and Crack Propagation

    Författare :Johan Jergeus; Chalmers University of Technology; []
    Nyckelord :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

  4. 3. Martensite formation in railway wheel flats

    Författare :Johan Jergeus; Chalmers University of Technology; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 4. Out-of-Round Railway Wheels - Causes and Consequences An Investigation Including Field Tests, Out-of-Roundness Measurements and Numerical Simulations

    Författare :Anders Johansson; Chalmers University of Technology; []
    Nyckelord :polygonalization; wheel flat; full-scale measurements; wear modelling; impact load detector; railway wheel out-of-roundness; wheel removal criterion; dynamic train-track interaction; corrugation;

    Sammanfattning : Causes and consequences of out-of-round railway wheels are investigated through literature studies, full-scale field experiments, out-of-roundness measurements, and numerical simulations. Both defects around the complete wheel circumference (e.g. polygonal wheels with wavelengths up to one wheel circumference) and local defects (e. LÄS MER

  7. 5. Analysis of rail breaks and insulated joint deterioration

    Författare :Johan Sandström; Chalmers University of Technology; []
    Nyckelord :Rail breaks; Heavy Haul; Insulated joints; Wheel flats; Railway mechanics; Material fatigue;

    Sammanfattning : The thesis deals with fatigue related issues in the field of railway mechanics. In particular rail breaks and deterioration of insulating joints are investigated. The study is largely motivated by plans to increase allowed axle loads in Sweden. LÄS MER