Search for dissertations about: "first normal stress difference"

Showing result 1 - 5 of 17 swedish dissertations containing the words first normal stress difference.

  2. 1. Simulations of the Dynamics of Fibre Suspension Flows

    Author : Stefan B. Lindström; Tetsu Uesaka; Myat Htun; Fritz Bark; Mittuniversitetet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibre; fibre suspension; simulation; paper; papermaking; forming; fibre orientation distribution; fibre flexibility; viscosity; first normal stress difference; fluid flow; simple shear flow; two-way coupling; three-dimensional; Chemical engineering; Kemiteknik; Engineering physics; Teknisk fysik; Fibre;

    Abstract : A new model for simulating non-Brownian flexible fibres suspended in a Newtonian fluid has been developed. Special attention has been given to include realistic flow conditions found in the industrial papermaking process in the key features of the model; it is the intention of the author to employ the model in simulations of the forming section of the paper machine in future studies. READ MORE

  4. 2. Numerical investigation on the formation mechanism of residual stress in metal cutting

    Author : Yang Liu; Industriell Produktion; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Residual stress; FEM; ; Metal cutting; Thermal-mechanical load; Plastic deformation;

    Abstract : Residual stress can be introduced unintentionally into the workpiece with various magnitudes and distributions through all manufacturing processes. These stresses have a significant effect upon the performance of the final component. READ MORE

  5. 3. Factors affecting alcohol self-administration : learning, environmental and genetic influences on behaviour

    Author : Christopher Pickering; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ethanol; operant self-administration; addiction; reward; learning; lever press response; context; environmental cue; novelty; stress; glutamate; GABA; noradrenaline; PCR; gene expression; functional genomics; prefrontal cortex; hippocampus; amygdala;

    Abstract : Alcoholism is a serious problem for society and is a very difficult disease to treat clinically. Often, the addict has periods of abstinence from alcohol followed by relapse to drinking and this cycle of use/non-use can repeat over many years. READ MORE

  6. 4. Modelling and simulation of paper structure development

    Author : Stefan Lindström; Tetsu Uesaka; Myat Htun; Cyrus Aidun; Mittuniversitetet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forming; Fibre; Paper; Fibre suspension; Paper structure; Simulation; Rheology; Chemical engineering; Kemiteknik; Engineering physics; Teknisk fysik;

    Abstract :           A numerical tool has been developed for particle-level simulations of fibre suspension flows, particularly forming of the fibre network structure of paper sheets in the paper machine. The model considers inert fibres of various equilibrium shapes, and finite stiffness, interacting with each other through normal, frictional, and lubrication forces, and with the surrounding fluid medium through hydrodynamic forces. READ MORE

  7. 5. On crack growth under compressive stresses

    Author : Per Isaksson; Mittuniversitetet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ph.D. Thesis; Fracture mechanics; Cellulose and paper engineering; Cellulosa- och pappersteknik; Hållfasthetslära; Solid Mechanics;

    Abstract : This thesis concerns fractures subjected to compressive stresses. In the four papers appended fracture behavior in brittle as well as ductile materials is studied. READ MORE