Sökning: "contact mechanics"

Visar resultat 21 - 25 av 248 avhandlingar innehållade orden contact mechanics.

  1. 21. Crack growth paths in rolling contact fatigue — Numerical predictions

    Författare :Mohammad Salahi Nezhad; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vector crack tip displacement; Crack face friction; Crack growth direction; Crack propagation; Rolling contact fatigue;

    Sammanfattning : Rolling contact fatigue (RCF) cracks in railway wheels and rails are costly and complex to deal with. Despite the extensive research efforts that have been put into understanding the mechanisms and developing appropriate predictive models for RCF crack growth, there are still a lot of open questions. LÄS MER

  3. 22. Geometry, Mechanics and Transmissivity of Rock Fractures

    Författare :Flavio Lanaro; KTH; []
    Nyckelord :anisotropy; angularity; anti-persistence; aperture; channelling; closure; contact area; contact mechanics; cross-correlation; deformability; dilation; flow; fractals; fracture; joint; laboratory; modelling; normal loading; persistence; power spectra; ;

    Sammanfattning : .... LÄS MER

  4. 23. Inflation and Instabilities of Hyperelastic Membranes

    Författare :Amit Patil; Anders Eriksson; Arne Nordmark; Peter Hansbo; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Membranes; Constrained inflation; Energy release rate; Adhesive contact condition; Limit point; Bifurcation point; Wrinkling; Tension field theory; Pressure induced instability.; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : The applications of membranes are increasing rapidly in various fields of engineering and science. The geometric, material, force and contact non-linearities complicate their analysis, which increases the demand for computationally efficient methods and interpretation of counter-intuitive behaviours. LÄS MER

  5. 24. Finite element procedures for crack path prediction in multi-axial fatigue

    Författare :Dimosthenis Floros; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fracture mechanics; Configurational forces; Mixed-mode; Numerical simulation; Rolling contact fatigue; Plasticity;

    Sammanfattning : Rolling Contact Fatigue (RCF) cracks in rails are among the most detrimental railway track defects regarding reliability and cost. The cracks typically grow in shear mode up to a certain length at which they might arrest or kink into a more tensile-driven growth. LÄS MER

  7. 25. Anisotropy in pearlitic steel subjected to rolling contact fatigue - modelling and experiments

    Författare :NASIM LARIJANI; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pearlitic steel; crack propagation; Rolling Contact Fatigue; Anisotropy; plasticity; High Pressure Torsion;

    Sammanfattning : In rails and wheels subjected to severe rolling/sliding contact, large plastic deformations accumulate in the surface layer. This decreases the fatigue resistance of components and makes this layer prone to formation of common rolling contact related defects. LÄS MER