Sökning: "fracture mechanisms"

Visar resultat 11 - 15 av 28 uppsatser innehållade orden fracture mechanisms.

  1. 11. Interaction between weld residualstresses and warm pre-stressing

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Elaheh Etemadi; [2019]
    Nyckelord :;

    Sammanfattning : Cleavage fracture is a catastrophic phenomenon as it is a sudden structural collapse occurring to structures made of insufficiently ductile steels working at lower temperatures. In this study, the focus is on the material used in reactor pressure vessels (RPV) in nuclear power plants. LÄS MER

  3. 12. Simulation of Delamination Migration in Laminated Composite Structures - An Approach Combining Extended Finite Elements and a Cohesive Zone Model

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Hållfasthetslära

    Författare :Viktor Björklund; [2018]
    Nyckelord :Crack propagation modeling; Fiber-reinforced polymer; Laminated composites; FRP; CFRP; Cohesive zone model; CZM; Delamination migration; FEM; XFEM; Fracture mechanics; Progressive damage modeling; Surface-based cohesive behaviour; Technology and Engineering;

    Sammanfattning : Fiber-reinforced polymer matrix composites are being used increasingly in lightweight applications where high strength and stiffness is required. One of the main challenges with designing components from such materials is to predict the ultimate strength and behaviour of the structure. LÄS MER

  4. 13. In-plane fracture analysis of paperboard using x-ray tomography

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Hållfasthetslära

    Författare :Daniel Andersson; Olof Hedberg; [2018]
    Nyckelord :paperboard; x-ray tomography; digital volume correlation; dvc; strain field; size effect; tensile experiment; strain rate; Technology and Engineering;

    Sammanfattning : In this Master's Thesis x-ray tomography was used during tensile experiments on paperboard to study delamination and cohesive failure. Digital volume correlation of the x-ray tomograph images enabled quantitative analysis of strain fields. LÄS MER

  5. 14. Ger tidig kastration ökad risk för felin fyseal dysplasi?

    Kandidat-uppsats, SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Författare :Stefan Lindén; [2017]
    Nyckelord :felin fyseal dysplasi; SCFE; katt; kastration; tillväxtplatta;

    Sammanfattning : Felin fyseal dysplasi är en defekt som karakteriseras av en progressiv för-skjutning av lårbenets ledhuvud i förhållande till proximala metafysen vilket slutligen resulterar i en fraktur tvärs över tillväxtzonen. Förskjutningen möj-liggörs av att tillväxtzonerna fortfarande är öppna samt onormalt tjocka. LÄS MER

  7. 15. Investigation of Ductility Dip at 1000˚C in Alloy 617

    Kandidat-uppsats, KTH/Materialvetenskap

    Författare :Julia Sjöström; Helena Åkesson; [2017]
    Nyckelord :Ductility dip cracking; Ni-based alloy; tortuous grain boundaries; intergranular precipitates; grain boundary migration; superalloy; M23C6; Ti N; C ; solid state cracking; dynamic recrystallization;

    Sammanfattning : Alloy 617 displays a ductility dip during straining at exactly 1000˚C, leading to brittle fracture. A sudden decrease in ductility appearing during Gleeble hot ductility tests of Ni-based superalloys is a well-known phenomenon, while its cause is unknown. LÄS MER