Sökning: "fatigue life"

Visar resultat 1 - 5 av 438 avhandlingar innehållade orden fatigue life.

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 in individuals with multiple sclerosis : lived experiences and perceived impact in daily life

   Författare :Gullvi Flensner; Birgitta Engström; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; action-theory; cooling; daily life; fatigue; perceived health; phenomenology; scale testing; MEDICINE; MEDICIN; Nursing; Vårdvetenskap;

   Sammanfattning : The overall aim of this thesis was to gain knowledge about experiences of fatigue among individuals diagnosed with MS and to compare these experiences with those of individuals in the general population. Individuals' experiences of fatigue have been approached both inductively and deductively and qualitative and quantitative research methods have been combined. LÄS MER

7. 5. Fatigue Life of Riveted Railway Bridges

   Författare :Björn Åkesson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; field tests; full-scale fatigue tests; steel bridges; fatigue life; railway bridges; riveted connections;

   Sammanfattning : This dissertation, which focuses on the fatigue life of riveted steel railway bridges, is based on: - A series of full-scale fatigue tests of nine riveted stringers taken from a railway bridge built in 1896. A review of and comparison with the different full-scale fatigue tests on riveted railway bridge members, which have been conducted in other laboratories over the years, is also given. LÄS MER