Sökning: "test-specimens"

Visar resultat 1 - 5 av 38 avhandlingar innehållade ordet test-specimens.

  1. 1. 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. 2. Rail grinding and its impact on the wear of wheels and rails

    Författare :Jonas Lundmark; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machine Elements; Maskinelement;

    Sammanfattning : Rail grinding has been employed since the 1980s in maintaining optimal rail profile as well as in the elimination of surface defects such as corrugations and head-checks. Likewise, the wheel sets also require re- turning to remove surface defects and restore the desired profile. LÄS MER

  4. 3. Modeling of Elasticity and Damping for Filled Elastomers

    Författare :Per Erik Austrell; Byggnadsmekanik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rheological models; contact-free strain measurement; modified hardness test; solid dumbbell test specimen; mechanical conditioning; strain energy plot; hyperelasticity; carbon-black-filled rubbers; amplitude dependence; multiaxial viscoplastic model; Building construction; Byggnadsteknik;

    Sammanfattning : Elasticity and damping are significant properties of rubber, taken advantage of in engineering applications. It is therefore important that the constitutive model accurately captures these aspects of the mechanical behavior. LÄS MER

  5. 4. Design of composite structures containing bolt holes and open holes

    Författare :Tomas Ireman; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis is concerned with stress analysis and strengthprediction in composite laminates containing bolt holes andopen holes. It covers both two- and three-dimensional analyses,and experiments have been carried out to determine criteriaparameters and to validate the analysis methods. LÄS MER

  7. 5. Improved Material Models for High Strength Steel

    Författare :Rikard Larsson; Larsgunnar Nilsson; Linköpings universitet; []
    Nyckelord :Plastic anisotropy; non-linear strain paths; mixed isotropic-kinematic hardening; isotropic-distortional hardening; dynamic strain ageing; static strain ageing; marten- sitic transformation;

    Sammanfattning : The mechanical behaviour of the three advanced high strength steel grades, Docol 600DP, Docol 1200M and HyTens 1000, has been experimentally investigated under various types of deformation, and material models have been developed, which account for the experimentally observed behaviour.Two extensive experimental programmes have been conducted in this work. LÄS MER