Sökning: "maximum surface stress"

Visar resultat 16 - 20 av 28 uppsatser innehållade orden maximum surface stress.

  1. 16. Wear mark evolution and numerical study of impact stresses in stainless steel flapper valves

    Master-uppsats, KTH/Materialvetenskap

    Författare :Jesper Larsson; [2016]
    Nyckelord :Flapper valve; FEM; Impact fatigue; Wear mark;

    Sammanfattning : Compressors that are used in refrigerators and air conditioners usually have flapper vales made of martensitic stainless steel to control the flow of the refrigerant in the system. During service the flapper valves are affected by both bending and impact fatigue in the very high cycle fatigue (VHCF) range with billions of cycles until failure. LÄS MER

  3. 17. Accelerated degradation of bipolar plates in the PEMFC

    Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Marcus Eriksson; [2016]
    Nyckelord :;

    Sammanfattning : The aging of bipolar plates in the polymer electrolyte membrane fuel cell was evaluated using different accelerated degradation tests. From previous studies, it is well known that the startups and shutdowns of a polymer electrolyte membrane fuel cell is the primary cause of fuel cell component degradation. LÄS MER

  4. 18. Evaluation of the Carbonization of Thermo-Stabilized Lignin Fibers into Carbon Fibers

    Master-uppsats, Linköpings universitet/Kemi; Linköpings universitet/Tekniska fakulteten

    Författare :Henrik Kleinhans; [2015]
    Nyckelord :Lignin; Carbon Fibers; Carbonization; Stabilization; Uniaxial Tensile Testing; Thermomechanical Analysis TMA ; Thermogravimetric Analysis TGA ; Fourier Transform Infrared Spectroscopy FTIR ; Scanning Electron Microscope SEM ; Energy Dispersive X-ray Spectrometer EDS ;

    Sammanfattning : Thermo-stabilized lignin fibers from pH-fractionated softwood kraft lignin were carbonized to various temperatures during thermomechanical analysis (TMA) under static and increasing load and different rates of heating. The aim was to optimize the carbonization process to obtain suitable carbon fiber material with good mechanical strength potential (high tensile strength and high E-modulus). LÄS MER

  5. 19. Structural integrity of dental crowns.

    Magister-uppsats, KTH/Hållfasthetslära (Inst.)

    Författare :Natalie Hamsund; [2014]
    Nyckelord :;

    Sammanfattning : There is currently no standardized method for testing dentures made of dental ceramic materials. This creates problems for comparisons between studies concerning strength in materials and geometry. The geometry of the maxillary first premolar was used for the analysis. LÄS MER

  7. 20. Simulation driven pre-operative planning for the treatment of hallux rigidus : A novel concept of implant assessment

    Master-uppsats, KTH/Medicinsk teknik

    Författare :Martin Paulsen; [2013]
    Nyckelord :Biomechanics; Implant assessment; Hallux rigidus; FEM.;

    Sammanfattning : The present study utilizes finite element analysis in order to simulate a surgical operation in the treatment of a hallux rigidus case, as designed and developed by Episurf Medical AB (Stockholm, Sweden). The surgical intervention includes an initial cheilectomy as well as an insertion of an orthopedic implant. LÄS MER