Sökning: "materialteknik"

Visar resultat 1 - 5 av 2071 avhandlingar innehållade ordet materialteknik.

  1. 1. Fatigue behaviour of a nickel based superalloy

    Detta är en avhandling från Henrik Andersson, Materials Engineering, BOX 118, SE - 221 00 LUND, SWEDEN

    Författare :Henrik Andersson; Lund University.; Lunds universitet.; [2002]
    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

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

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

    Författare :Michael Andersson; Lund University.; Lunds universitet.; [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

  3. 3. Modelling and simulation of short fatigue cracks

    Detta är en avhandling från Div. Materials Engineering, Lund University, P O Box 118, SE-221 00 Lund, Sweden

    Författare :Christina Bjerkén; Lund University.; Lunds universitet.; [2003]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; materialteknik; Materiallära; Material technology; Interface cracks; Dislocations; Short cracks; Local plasticity;

    Sammanfattning : The growth of short fatigue cracks deviates from the behaviour of long fatigue cracks even if subjected to the same nominal driving force. The influence from the microstructure is pronounced, while crack closure effects may not be that important as for longer cracks. LÄS MER

  4. 4. A Methodology to Control the Microstructure of Plasma Sprayed Coatings

    Detta är en avhandling från Martin Friis, University of Trollhättan/Uddevalla, P.O. Box 957, SE-461 29

    Författare :Martin Friis; Lund University.; Lunds universitet.; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; materialteknik; Materiallära; Process map; Plasma spraying; process window; Thermal Barrier Coating; Zirconia; DPV2000; particle temperature; Material technology; particle velocity;

    Sammanfattning : The aim of this thesis is to enhance the overall understanding of the plasma spray process and increase control and reproducibility of the coating properties. This was performed by establishment of relationships between controllable process parameters, in-flight properties of the injected particles (velocity and temperature), and microstructure properties. LÄS MER

  5. 5. Life Prediction and Mechanical Behavior of Thermal Barrier Coatings

    Detta är en avhandling från Div. Materials Engineering, Lund University, P O Box 118, SE-221 00 Lund, Sweden

    Författare :Yan Liu; Lund University.; Lunds universitet.; [2003]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Stress intensity factors; Macro-cracks; Micro-cracks; Mechanical behaviour; Thermal barrier coatings; Life prediction; Material technology; Materiallära; materialteknik;

    Sammanfattning : Delamination and spallation of thermal barrier coating (TBC) systems, used in hot parts of gas turbines, have been studied with respect to thermal fatigue. TBCs with and without pre-existing cracks were investigated. Thermal shock tests were performed until coating spallation. LÄS MER