Sökning: "crack growth"

Visar resultat 11 - 15 av 184 avhandlingar innehållade orden crack growth.

  1. 11. Fatigue crack growth experiments and analyses - from small scale to large scale yielding at constant and variable amplitude loading

    Författare :Pär Ljustell; Fred L. Nilsson; Bo Alfredsson; Gunnar Härkegård; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fracture mechanics; fatigue crack growth; finite elements analysis; small scale yielding SSY ; large scale yielding LSY ; low cycle fatigue LCF ; crack tip opening displacement CTOD ; crack closure; potential drop method; constant amplitude load; variable amplitude load; inconel 718; stainless steel 316L;

    Sammanfattning : This thesis is on fatigue crack growth experiments and assessments of fatigue crack growth rates. Both constant and variable amplitude loads in two different materials are considered; a nickel based super-alloy Inconel 718 and a stainless steel 316L. LÄS MER

  3. 12. Oxidation induced failure of superalloys: High temperature crack growth and oxide scale properties

    Författare :Anand Harihara Subramonia Iyer; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; micromechanical testing; crack growth; Nickel superalloys; scanning electron microscopy; focused ion beam microscopy;

    Sammanfattning : Gas turbine materials are designed to work in extreme environments in high temperature with an oxidising environment and variable mechanical loading. The study of high temperature fatigue properties of these materials is therefore important. LÄS MER

  4. 13. On crack growth under compressive stresses

    Författare :Per Isaksson; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ph.D. Thesis; Fracture mechanics; Cellulose and paper engineering; Cellulosa- och pappersteknik; Hållfasthetslära;

    Sammanfattning : This thesis concerns fractures subjected to compressive stresses. In the four papers appended fracture behavior in brittle as well as ductile materials is studied. LÄS MER

  5. 14. Predicting shear type crack initiation and growth in concrete with non-linear finite element method

    Författare :Richard Malm; Håkan Sundquist; Anders Ansell; Kent Gylltoft; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-linear finte element analysis; concrete; crack width; crack propagation; shear; Building engineering; Byggnadsteknik;

    Sammanfattning :   In this thesis, the possibility to numerically describing the behaviour that signifies shear type cracking in concrete is studied. Different means for describing cracking are evaluated where both methods proposed in design codes based on experiments and advanced finite element analyses with a non-linear material description are evaluated. LÄS MER

  7. 15. Modelling of surface initiated rolling contact fatigue crack growth using the asperity point load mechanism

    Författare :Dave Hannes; Bo Alfredsson; Anders Ekberg; KTH; []
    Nyckelord :rolling contact fatigue; spalling; asperity; fatigue crack path; fatigue crack growth; mode I; plane mixed-mode; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : .... LÄS MER