Sökning: "fatigue"

Visar resultat 1 - 5 av 1007 avhandlingar innehållade ordet fatigue.

  1. 1. Oxidation, Creep and Fatigue Synergies in Cast Materials for Exhaust Manifolds

    Författare :Shengmei Xiang; Joakim Odqvist; Baohua Zhu; Stefan Jonsson; Johan Ahlström; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fatigue; low-cycle fatigue; fatigue in an inert atmosphere; fatigue in a synthetic diesel exhaust atmosphere; corrosion-fatigue; creep-fatigue; high-temperature corrosion; high-temperature fatigue; synergistic effect; corrosion-fatigue synergy; creep-fatigue synergy; high-temperature alloys; fatigue damage; creep-fatigue damage; corrosion-fatigue damage; ductile cast iron; high-alloyed austenitic cast steel; thermal cycling; precipitation; aging.; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : The future development of engines of heavy-duty vehicles towards reduced CO2 emission will increase the exhaust gas temperature and render the exhaust atmosphere more corrosive. The current service material of exhaust gas components - a ferritic ductile cast iron called SiMo51 - will soon meet its upper-temperature limit. LÄS MER

  3. 2. Fatigue och återhämtning efter hjärtinfarkt

    Författare :Ulla Fredriksson-Larsson; Eva Brink; Pia Alsén; Högskolan Väst; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Coping strategies; fatigue; grounded theory; myocardial infarction; nursing; person-centeredness; psychometric evaluation; Rasch analysis; stress; symptom assessment; symptom experience; symptom research; The Multidimensional Fatigue Inventory-20 MFI-20 ; Vårdvetenskap; Nursing science; Fatigue; Myocardial infarction; Symptom experience; Psychometric evaluation; Coping strategies; grounded theory; nursing; Rasch analysis;

    Sammanfattning : Fast and efficient acute medical treatment of myocardial infarction (MI) has developed during recent years and has resulted in a reduced number of days spent in hospital and increased survival. To optimize persons’ recovery, secondary preventive strategies are important. LÄS MER

  4. 3. Very high cycle fatigue of high performance steels

    Författare :Vitaliy Kazymyrovych; Karlstads universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fatigue; tool steels; ultrasonic testing; fatigue life; crack growth rate; fatigue mechanisms; Materialteknik; Materials Engineering;

    Sammanfattning : Many engineering components reach a finite fatigue life well above 109 load cycles. Some examples of such components are found in airplanes, automobiles or high speed trains. For some materials the fatigue failures have lately been found to occur well after 107 load cycles, namely in the Very High Cycle Fatigue (VHCF) range. LÄS MER

  5. 4. Fatigue of steel bridges : New structural details and the implementation of high strength steel

    Författare :Oskar Skoglund; John Leander; Raid Karoumi; Alain Nussbaumer; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high strength steel; fatigue; steel bridges; steel and concrete composite bridges; new structural details; linear elastic fracture mechanics; effective notch stress method; nominal stress method; Structural Engineering and Bridges; Bro- och stålbyggnad;

    Sammanfattning : The use of high strength steel has the potential to reduce the amount of steel used in bridge structures and thereby facilitate a more sustainable construction. The amount of steel and what steel grade that can be used in bridge structures and other cyclic loaded structures are often limited by a material degradation process called fatigue. LÄS MER

  7. 5. Fatigue in long-term illness : Influencing factors and functional performance in chronic obstructive pulmonary disease and in cancer

    Författare :Kristina Tödt; Anna Efverman; Maria Engström; Magnus Ekström; Marlene Malmström; Högskolan i Gävle; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; fatigue; chronic obstructive pulmonary disease; cancer; daily activity; health-related quality of life; mental health; physical capacity; physical activity; radiotherapy; work ability; fatigue; kroniskt obstruktiv lungsjukdom; cancer; daglig aktivitet; hälsorelaterad livskvalitet; oro och nedstämdhet; fysisk kapacitet; fysisk aktivitet; strålbehandling; arbetsförmåga;

    Sammanfattning : Syfte: Avhandlingen studerade sambandet mellan fatigue (trötthet) och valda inverkande faktorer, funktionsförmåga (fysisk och daglig aktivitet och arbetsförmåga) samt med hälsorelaterad livskvalitet (HRQL) vid kroniskt obstruktiv lungsjukdom (KOL) och vid cancer. Metod: Patienter med KOL (n=121, delarbete I-II) och patienter med cancer under pågående strålbehandling (n=457, delarbete III) studerades i tvärsnittsstudier. LÄS MER