Sökning: "Orthotropic."

Visar resultat 6 - 10 av 38 uppsatser innehållade ordet Orthotropic..

  1. 6. Wood and moisture-induced strains in a large deformation setting in 3D

    Master-uppsats, Linnéuniversitetet/Institutionen för byggteknik (BY)

    Författare :Fredrik Ström; Anwar Obeido; [2022]
    Nyckelord :Total Lagrangian; Finite element method; Large deformation theory; Deformation gradient decomposition; Moisture-induced strains; Hygroscopic; Orthotropic.;

    Sammanfattning : Many studies have previously been done on moisture-induced strains in wood. An in- finitesimal/engineering strain model has been used for most of these studies, which is often an accurate approximation for small rotations. However, if large deformations oc- cur, then fictive strains are obtained resulting from the simplified engineering strain. LÄS MER

  3. 7. Micromechanical modelling of creep in wooden materials

    Kandidat-uppsats, Uppsala universitet/Tillämpad mekanik

    Författare :Oskar Falkeström; Kevin Coleman; Malin Nilsson; [2021]
    Nyckelord :Creep; RVE; Homogenization; Honeycomb; Tracheid; Comsol Multiphysics; Micromechanical modelling; Orthotropic; Parametric study; S2 material; Norwegian Spruce; Scots Pine; Cell geometry;

    Sammanfattning : Wood is a complex organic orthotropic viscoelastic material with acellular structure. When stressed, wood will deform over timethrough a process called creep. Creep affects all wooden structureand can be difficult, time-consuming and expensive to measure. For this thesis, a simple computer model of the woodenmicrostructure was developed. LÄS MER

  4. 8. Experimental and numerical analysis of orthotropic deformations of wood using Finite Strain Theory (large deformations) and the Finite Element Method (FEM) in 2D

    Master-uppsats, Linnéuniversitetet/Institutionen för byggteknik (BY)

    Författare :Honghao Ren; [2021]
    Nyckelord :Orthotropic material; Largedeformation; Two-dimension; Non-linear elasticity;

    Sammanfattning : This thesis involves the derivation of a constitutive model under large deformationtheory using Updated Lagrange method applied on an orthotropic material.Thefollowing aspects are included in this thesis work: introduction, theory, FEM implementation, derivation of constitutive model, calibration, result, discussion, conclusion and the future work. LÄS MER

  5. 9. Shear stiffness of cross laminated timber diaphragms - A study of the influence of connection and member stiffness

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Byggnadsmekanik; Lunds universitet/Institutionen för byggvetenskaper

    Författare :Gustaf Olausson; [2021]
    Nyckelord :Technology and Engineering;

    Sammanfattning : Since ancient times, buildings have been constructed with the use of timber and during the modern era, new types of timber products have been developed. Today, more constructions, especially residential buildings are being built with timber as the main load-bearing material. LÄS MER

  7. 10. FE-Modelling of a Joint for Cross-Laminated Timber

    Master-uppsats, Karlstads universitet/Avdelningen för maskin- och materialteknik

    Författare :Linus Ekhagen; [2021]
    Nyckelord :cross-laminated timber; fe-modelling; continuum damage mechanics; fracture; korslimmat trä; fe modellering; skademekanik; brott;

    Sammanfattning : Woodbe Engineering AB is a freshly started company that has developed a new type of joint for cross-laminated timber (CLT). The joint does not include any metallic fasteners, which improves sustainability, the ergonomics for the workers and time efficiency. LÄS MER