Sökning: "crack growth"

Visar resultat 1 - 5 av 160 avhandlingar innehållade orden crack growth.

  1. 1. High Strain Fatigue Crack Growth and Crack Closure

    Detta är en avhandling från Department of Mechanical Engineering, Lund University

    Författare :Michael Andersson; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; materialteknik; Materiallära; Material technology; crack closure; high strain fatigue; crack grotwh;

    Sammanfattning : Understanding of the growth of fatigue cracks is of utmost importance since such growth often has a profound influence on the life of components subjected to cyclic loading. Thus, reliable fatigue life models enable a more efficient use of materials and improve the performance and efficiency in many applications. LÄS MER

  2. 2. Time-dependent crack growth and fracture in concrete

    Detta är en avhandling från Division of Building Materials, LTH, Lund University

    Författare :Fan Ping Zhou; [1992]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; creep; rupture test; sustained loading; deformationer; betong; brottmekanik; sprickor; sprickbildning; sprickmodeller; krypning; spänningar; brottenergi; brottspänningar; beräkningsmodeller; finita element; teori; laboratorieförsök; creep rupture; tidsberoende; fracture mechanics; Fictitius Crack Model; finite element method; visco-elastic fracture; time-dependent fracture; creep crack growth; concrete; tensile fracture; crack model;

    Sammanfattning : The objectives of this thesis are to study time-dependent fracture behaviour in concrete. The thesis consists of an experimental study, constitutive modelling and numerical analysis... LÄS MER

  3. 3. Numerical models of ductile crack growth

    Detta är en avhandling från Stockholm : Hållfasthetslära

    Författare :Annika Trädegård; KTH.; [2000]
    Nyckelord :solid mechanics; nonlinear fracture mechanics; elastic-plastic fracture; finite element method; remeshing; constraint; two-parameter characterisation; stable ductile crack growth; cleavage; weibull stress; void growth;

    Sammanfattning : .... LÄS MER

  4. 4. Oxygen Induced High Temperature Crack Growth in Ni-base Superalloys

    Detta är en avhandling från Stockholm : Hållfasthetslära

    Författare :Leif Viskari; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diffusion; Environmental influence; Crack growth; Atom probe tomography; Electron Microscopy; Deformation; Crack tip oxidation; Hold-time fatigue;

    Sammanfattning : Oxygen induced crack growth is a serious concern for the performance of Ni-base superalloys. These alloys are used in gas-turbine engines where they are exposed to hightemperatures, mechanical loads and oxygen-rich environments. LÄS MER

  5. 5. Initiation and early crack growth in VHCF of stainless steels Experimental and theoretical analysis

    Detta är en avhandling från Karlstad : Karlstads universitet

    Författare :Muhammad Waqas Tofique; Karlstads universitet.; [2016]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Very High Cycle Fatigue; Stainless steel; Ultrasonic fatigue testing; Crack initiation; Crystallographic crack growth; Distributed Dislocation Dipole Technique; Closed cracks; Materialteknik; Materials Engineering;

    Sammanfattning : Mechanical fatigue is a failure phenomenon that occurs due to repeated application of mechanical loads. Very High Cycle Fatigue (VHCF) is considered as the domain of fatigue life greater than 10 million load cycles. LÄS MER