Sökning: "Finite strain theory"

Visar resultat 16 - 20 av 52 avhandlingar innehållade orden Finite strain theory.

  1. 16. Fracture mechanics studies of non-yielding materials like concrete : modelling of tensile fracture and applied strength analyses

    Författare :Per-Johan Gustafsson; Institutioner vid LTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cracking; corners; test-specimens; strength; tension; fracture mechanics; strain localization; size-effect; flexural strength; LEFM; fictitious crack model; Weibull; FEM; pipes; shear strength; concrete; diagonal tension;

    Sammanfattning : Fracture mechanics studies of non-yielding materials are presented. The studies are based on theoretical models for the macroscopical mechanical behaviour of materials during tensile stress induced fracture. A number of applied numercal analysis are indicated. LÄS MER

  3. 17. Theory of Random Matrices and Elasticity Applied to Nanowires and Mechanical Vibrations

    Författare :Johan Grönqvist; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis presents work in several areas relating to Random Matrix Theory and Elasticity. It contains 4 papers presenting work on different issues. Paper I concerns correlations between eigenvalues in random matrices of real symmetric (GOE) or quaternion real (GSE) form. LÄS MER

  4. 18. Numerical Analysis of Moisture-Related Distortion in Sawn Timber

    Författare :Sigurdur Ormarsson; Chalmers University of Technology; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Computer simulations; Deformation; Wood; Moisture; Drying; Finite element method; Byggteknik; Civil engineering;

    Sammanfattning : A 3D theory for the numerical simulation of deformations and stresses in wood during moisture variation is described. The constitutive model employed assumes the total strain rate to be the sum of the elastic strain rate, the moisture-induced strain rate, the mechano-sorption strain rate and the creep strain rate. LÄS MER

  5. 19. Modelling Damage Evolution and Fracture of Paper Materials

    Författare :Rickard Hägglund; Hållfasthetslära; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Paper material; Fracture mechanics; Tensile strength; Fibre network; Continuum damage mechanics; Non-local theory;

    Sammanfattning : This thesis contains six papers dealing with different aspects of damage and fracture in paper. The work addresses the problem of material length scales in the context of deformation and fracture of paper materials. LÄS MER

  7. 20. Multiscale Modelling of Proximal Femur Growth : Importance of Geometry and Influence of Load

    Författare :Priti Yadav; Elena Gutierrez Farewik; Marco Viceconti; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bone tissue modeling; deformity; biomechanics; osteogenic index; poroelastic material; octahedral shear stress; hydrostatic stress; fluid velocity; octahedral shear strain; MRI; walking; jumping; sedentation; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : Longitudinal growth of long bone occurs at growth plates by a process called endochondral ossification. Endochondral ossification is affected by both biological and mechanical factors. LÄS MER