Sökning: "Constitutive models"

Visar resultat 21 - 25 av 203 avhandlingar innehållade orden Constitutive models.

  1. 21. Calibration and Modelling of Adipose Tissue Under Impact Loading

    Författare :Hosein Naseri; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Constitutive modelling; Global sensitivity analysis; Adipose tissue; Finite element human body models; Obesity;

    Sammanfattning : Vehicular injury is one of the main reasons for traumatic injuries. Finite Element HumanBody Models (FEHBM) have become very popular to assess car crashes and the subsequentinjuries. It provides the possibility to predict stress and strain values in tissue level byrepresenting anatomical structures in details. LÄS MER

  3. 22. Fracture mechanics models for fatigue in concrete structures

    Författare :Kent Gylltoft; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structural Engineering; Konstruktionsteknik;

    Sammanfattning : This thesis deals with the application of fracture mechanics to model monotonic and cyclic loading of reinforced concrete structures. The main features of the work are: - Constitutive modelling based on fracture mechanics - Numerical studies of the models in various applications - Experimental studies to check the models and to determine material parameters The fracture mechanics models are formulated on a constitutive level. LÄS MER

  4. 23. Behaviour and modelling of a natural soft clay : triaxial testing, constitutive relations and finite element modelling

    Författare :Bo Westerberg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Soil Mechanics; Geoteknik;

    Sammanfattning : The main objectives if the research project have been to create an experimental basis for a more general theoretical modelling of Swedish clays and to improve the knowledge of the mechanical behaviour of natural soft clays. Another objective has been to investigate the effects of end restraint on the mechanical behaviour obtained in triaxial tests, by means of numerical simulations. LÄS MER

  5. 24. Continuum models and numerical methods for tribological systems

    Författare :Peter Jarl Ireman; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : This thesis concerns the formulation of continuum mechanical models and the development of numerical methods for frictional heating, wear and damage in tribological systems.The models are formulated in the spirit of generalized standard materials, i.e. LÄS MER

  7. 25. Micromechanism based material models for natural fiber composites

    Författare :Erik Marklund; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymera konstruktionsmaterial; Polymeric Composite Materials;

    Sammanfattning : The objective of Paper A was to develop a material model which includes all nonlinear viscoelastic phenomena observed in compressive tests on vinyl ester specimens using experimental data. The constitutive model developed by Schapery in the particular form previously presented by Megnis and Varna is used. LÄS MER