Sökning: "Phase-field method"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden Phase-field method.

  1. 1. Martensitic Transformations in Steels A 3D Phase-field Study

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Hemantha Kumar Yeddu; KTH.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase-field method; Martensitic transformations; Plastic de formation; Multi-length scale modeling; Microstructure; Stress states; Steels;

    Sammanfattning : Martensite is considered to be the backbone of the high strength of many commercial steels. Martensite is formed by a rapid diffusionless phase transformation, which has been the subject of extensive research studies for more than a century. LÄS MER

  2. 2. Phase-field modeling of diffusion controlled phase transformations

    Detta är en avhandling från Stockholm : Mekanik

    Författare :Irina Loginova; KTH.; [2003]
    Nyckelord :phase-field; dendritic growth; grain boundary; Widmanstaetten plate; solidification;

    Sammanfattning : Diffusion controlled phase transformations are studied bymeans of the phase-field method. Morphological evolution ofdendrites, grains and Widmanst\"atten plates is modeled andsimulated.Growth of dendrites into highly supersaturated liquids ismodeled for binary alloy solidification. LÄS MER

  3. 3. Phase-field modeling of surface-energy driven processes

    Detta är en avhandling från Stockholm : KTH, Materialvetenskap

    Författare :Klara Asp Grönhagen; KTH.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase-field method; surface energy; solute drag; solid-state sintering; multicomponent multiphase flow; wetting; liquid-phase sintering; spinodal decomposition; CALPHAD; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap;

    Sammanfattning : Surface energy plays a major role in many phenomena that are important in technological and industrial processes, for example in wetting, grain growth and sintering. In this thesis, such surface-energy driven processes are studied by means of the phase-field method. LÄS MER

  4. 4. Phase field modeling of flaw-induced hydride precipitation kinetics in metals

    Detta är en avhandling från Chalmers University of Technology

    Författare :Claudio Nigro; Chalmers tekniska högskola.; Chalmers University of Technology.; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydride; phase field theory; linear elastic fracture mechanics; finite element method; phase transformation; hydrogen embrittlement; finite volume method;

    Sammanfattning : Hydrogen embrittlement can manifest itself as hydride formation in structures when in contact with hydrogen-rich environments, e.g. in space and nuclear power applications. To supplant experimentation, modeling of such phenomena is beneficial to make life prediction reduce cost and increase the understanding. LÄS MER

  5. 5. Computational Techniques for Coupled Flow-Transport Problems

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Martin Kronbichler; Uppsala universitet.; Uppsala universitet.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Finite element method; saddle point systems; two-phase flow; level set method; phase field method; stabilization; contact line dynamics; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : This thesis presents numerical techniques for solving problems of incompressible flow coupled to scalar transport equations using finite element discretizations in space. The two applications considered in this thesis are multi-phase flow, modeled by level set or phase field methods, and planetary mantle convection based on the Boussinesq approximation. LÄS MER