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Showing result 1 - 5 of 22 essays matching the above criteria.

  1. 1. Life extension of welded steel details in bridges

    University essay from KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Author : Zhelei Jin; [2023]
    Keywords : Welded joints; Fatigue; Pre-fatigue; Life extension; Fracture mechanics; Finite element analysis; HFMI; ; Svetsade fogar; utmattning; förutmattning; livsförlängning; frakturmekanik; finit elementanalys; HFMI; ;

    Abstract : High-Frequency Mechanical Impacts (HFMI) is a surface treatment technique utilized to introduce residual stresses and extend the service life of structures. This project primarily focuses on studying the life extension effects of HFMI on welded structures that have undergone fatigue and have existing cracks. READ MORE

  3. 2. Cracking and Fatigue in the Prestressed Concrete Bridge at Autio

    University essay from Luleå tekniska universitet/Byggkonstruktion och brand

    Author : Kasper Andersson; Jon Leidzén; [2022]
    Keywords : Fatigue; Cracking; Prestressed Concrete Bridge; Rainflow;

    Abstract : In early 2020, cracks were discovered on the bridge crossing the Torne River at Autio. This resulted in an investigation being launched to determine the structural state of the bridge. READ MORE

  4. 3. Fretting fatigue life analysis for a gas turbine compressor blade-disk material combination

    University essay from KTH/Hållfasthetslära

    Author : Elham Khoramzad; [2020]
    Keywords : ;

    Abstract : In order to analyse fretting fatigue life of dove-tail joints used in the compressor stage of a gas turbine, experimental study of different material combinations was conducted using rectangular fatigue specimen and bridge type pads. Specimen and pad interaction was simulated numerically and obtained results was used as input for 2 different crack propagation life prediction methods. READ MORE

  5. 4. Fatigue Analysis of a Lively Footbridge

    University essay from KTH/Bro- och stålbyggnad

    Author : Kristi Bila; [2019]
    Keywords : ;

    Abstract : The commitment of building aesthetic bridges made of stiff materials results in theconstruction of slender structures highly susceptible to dynamic loading. In the caseof footbridges located over a highly trafficked highway, such dynamic loads maybe the aerodynamic pressure induced by the heavy trucks passing underneath thestructure and the pedestrian loading involving a pedestrian running and jumping. READ MORE

  6. 5. Preparing for Rainy Days: Swedish and South Korean Narratives on the Sunshine Policy

    University essay from Lunds universitet/Centrum för öst- och sydöstasienstudier

    Author : Julia Bergström; [2019]
    Keywords : Sunshine Policy; Foreign policy; Sweden; South Korea; National role conceptions; Sensemaking; National identity; Social Sciences;

    Abstract : This thesis explores the correlation between national role conceptions, national identities and sensemaking processes among South Korean and Swedish policy influencers during the Sunshine Policy years of 1998-2003. The study relies on in depth semi structured interviews with 10 policy influencers who work with North Korea policies. READ MORE