Sökning: "Frakturmekanik"

Hittade 3 uppsatser innehållade ordet Frakturmekanik.

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

    Master-uppsats, KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

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

    Sammanfattning : 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. LÄS MER

  3. 2. Evaluation of cracks in corrugated board, Evaluating cracks using Finite Element Method and J-integral

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Ming-Yang Li; [2021]
    Nyckelord :corrugated board; corrugated box; finite element method; fracture mechanics; mechanical properties; wellpapp; finita elementmetoden; frakturmekanik; mekaniska egenskaper;

    Sammanfattning : This report investigates whether a FEM model can be used to assess the risk of crack growth in corrugated board. A set of box geometries with cracks at different locations were loaded and then compared using the evaluated J-integral within the FEM software. LÄS MER

  4. 3. An Attempt Towards FE-Modelling of Fracture Propagation in Railway Wheels

    Master-uppsats, KTH/Spårfordon

    Författare :Fred Öhnander; [2018]
    Nyckelord :Railway wheel; Wheel-rail contact; Wear; Fracture initiation; Physical fracture propagation model; FE-model; Fracture mechanics; XFEM; Inclusion; Järnvägshjul; Hjul-räl-kontakt; Slitage; Sprickinitiering; Fysisk sprickbildningsmodell; FE-modell; Frakturmekanik; XFEM; Imperfektion;

    Sammanfattning : The demand for higher velocities and heavier axle loads for freight trains leads to higher forces on the railway wheels which in turn lead to an increase in stresses on and below the surface of the wheel-rail contact. By time, this induces wear on the wheels which consequently lead to higher maintenance costs and in some cases accidents. LÄS MER