Sökning: "Crack closure"

Visar resultat 16 - 20 av 39 avhandlingar innehållade orden Crack closure.

  1. 16. Modelling and experimental evaluation of non-linear fatigue crack propagation in a ductile superalloy

    Författare :Daniel Ewest; Per Almroth; Kjell Simonsson; Björn Sjödin; Daniel Leidermark; Sören Sjöström; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Fatigue life evaluation is an important part in the design process of an industrial gas turbine. The fatigue life can be divided into crack initiation and crack propagation, and not to address the crack propagation part usually yields a non-conservative and overcomplicated design. LÄS MER

  3. 17. Effects of Non-uniform Fiber Distribution on Fiber/matrix Interface Crack Propagation in Polymeric Composites

    Författare :Linqi Zhuang; Albertro Barroso Caro; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymeric Composite Materials; Polymera konstruktionsmaterial;

    Sammanfattning : Fiber/matrix interface cracking plays an important role in determining the final failureof unidirectional (UD) composites. When subjected to longitudinally tensile loading,fiber/matrix interface debonds originate from fiber breaks or initial defects propagatealong loading direction. LÄS MER

  4. 18. On fatigue crack growth modelling of surface initiated rolling contact fatigue using the asperity point load mechanism

    Författare :Dave Hannes; Bo Alfredsson; Sylvie Pommier; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Load transfer in applications or between machine components is generally achieved through contact. In case of recurrent high contact loads in combination with a rolling motion, i.e. with a relatively small amount of slip, the contact surface may eventually suffer from rolling contact fatigue (RCF). LÄS MER

  5. 19. Life prediction and mechanisms for the initiation and growth of short cracks under fretting fatigue loading

    Författare :Alessandro Cadario; Bo Alfredsson; David Nowell; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fretting fatigue; Fretting experiment; Friction evolution; Fatigue crack initiation; Fatigue crack growth; Short crack; Non-destructive testing; Acoustic emission; Potential drop; Shot peening; Stress relaxation; Crack closure; Finite element method; Titanium alloy.; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : Fretting fatigue is a damage process that may arise in engineering applications where small cyclic relative displacements develop inside contacts leading to detrimental effects on the material fatigue properties. Fretting is located in regions not easily accessible, which makes it a dangerous phenomenon. LÄS MER

  7. 20. Fatigue behaviour of a nickel based superalloy

    Författare :Henrik Andersson; Materialteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; materialteknik; Materiallära; Material technology; Bodner-Partom; Fatigue; High temperature;

    Sammanfattning : This thesis deals with different aspects of fatigue crack propagation in IN718. The ultimate objective of the work is to gain understanding of the fatigue process, from the macroscopic stress-strain relations to microscopic fatigue crack growth mechanisms. LÄS MER