Search for dissertations about: "fatigue assessment"

Showing result 6 - 10 of 148 swedish dissertations containing the words fatigue assessment.

  2. 6. Fatigue Assessment and Extreme Response Prediction of Ship Structures

    Author : Wengang Mao; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fatigue assessment; extreme response; rainflow; narrow-band approximation; Laplace Moving Average model; transformed Gaussian; zero up-crossing response frequency; significant wave height; safety index; upcrossing spectrum; long term cumulative distribution function; ship routing.; transformed Gaussian;

    Abstract : In this thesis, a simplified narrow-band approximation model is proposed to estimate fatigue damage of ship structures, and an efficient method for extreme response predictions is also developed using upcrossing spectrums of ship responses. The proposed fatigue model includes two main parameters, significant stress range hs and zero upcrossing frequency fz. READ MORE

  4. 7. Fatigue properties of cut and welded high strength steels : Quality aspects in design and production

    Author : Thomas Stenberg; Zuheir Barsoum; Kenneth Alasdair MacDonald; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Welding; Fatigue assessment; Cutting; Weld quality; Fatigue design; Fracture Mechanics; Vehicle and Maritime Engineering; Farkostteknik;

    Abstract : This doctoral thesis concerns fatigue of welded structures. Welding is one of the world’s most common joining methods and it is frequently used in several structural applications in many fields. Some examples are construction vehicles, loader cranes, trucks, busses, forestry and agricultural machines, bridges and ships. READ MORE

  5. 8. Aspects of creep-fatigue in gas turbine hot parts

    Author : Magnus Hasselqvist; Gunnar Härkegård; Linköpings universitet; []
    Keywords : creep; fatigue; TMF; gas turbine; modelling; life assessment; ageing; micro-structure; solute drag; back stress; Haynes 230; IN792;

    Abstract : The goal is reliable creep-fatigue lifing methodology for industrial gas turbines.A literature study on high temperature materials used in gas turbines reveals that:• Most testing/modelling work has focused on characterisation and modelling of material response in isothermal standard tests, i.e. creep, tensile and LCF tests. READ MORE

  6. 9. Fatigue after traumatic brain injury : exploring novel methods for diagnosis and treatment

    Author : Nils Berginström; Anna Nordström; Peter Nordström; Lars Nyberg; Jan Lexell; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Traumatic brain injury; fatigue; OSU6162; randomized clinical trials; functional magnetic resonance imaging; neuropsychology; structural magnetic resonance imaging; white matter hyperintensities; rehabiliteringsmedicin; Rehabilitation Medicine;

    Abstract : Background: Traumatic brain injury (TBI) is one of the most common causes of disability and mortality. While some patients recover quickly, especially at the mild side of the injury severity continuum, many will experience symptoms for years to come. READ MORE

  7. 10. Fatigue Assessment of Friction Stir Welded Joints in Aluminium Profiles

    Author : Meysam Mahdavi Shahri; Rolf Sandström; Per Jahn Haagensen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Friction stir welding; Fatigue; Aluminium alloys; Critical distance; Finite element method; Standard codes;

    Abstract : Friction stir welding (FSW) is a low heat input solid state welding technology. It is often used for fabrication of aluminium alloys in transportation applications including railway, shipbuilding, bridge structures and automotive components. READ MORE