Search for dissertations about: "drying deformation"

Showing result 1 - 5 of 27 swedish dissertations containing the words drying deformation.

  2. 1. Numerical Analysis of Moisture-Related Distortion in Sawn Timber

    Author : Sigurdur Ormarsson; Chalmers University of Technology; []
    Keywords : 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;

    Abstract : 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. READ MORE

  4. 2. Creep, deformation and moisture redistribution during air convective wood drying and conditioning : air convective wood drying and conditioning

    Author : Tom Morén; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träteknik; Wood Technology;

    Abstract : Air convective wood drying is associated with a considerable risk for damage to the timber, especially checking and warping. This thesis contains an analysis of creep and deformation during wood drying related to stress development and susceptibility of checking. Also heat and mass transfer problems in the wood drying process are considered. READ MORE

  5. 3. Constitutive Modelling and Finite Element Analysis of Concrete Structures with Regard to Environmental Influence

    Author : Ola Dahlblom; Byggnadsmekanik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Elemente Method; Constitutive model; Concrete; Environment; Moisture; Drying; Temperature; Fracture; Fictitious crack model; Smeared Crack; Creep; Shrinkage; Pickett Effect;

    Abstract : A constitutive model for concrete is formulated. Tensile fracture is described using a smeared crack approach where the fracrure energy is considered and the shear stiffneess in the cracked region is gradually reduced as crackling develops. READ MORE

  6. 4. A Finite Element Study of the Shape Stability of Sawn Timber Subjected to Moisture Variations

    Author : Sigurdur Ormarsson; Hans Petersson; Ola Dahlblom; Lund University; []
    Keywords : simulation; deformation; wood; moisture; finite element method; Byggteknik; Civil engineering;

    Abstract : Shape instability in timber products exposed to moisture variation is a serious problem since it can make wood products unsuitable for construction purposes. In this thesis the finite element method has been used to simulate deformations during the drying process.….…. READ MORE

  7. 5. Moisture Transport and Moisture-Induced Distortions in Timber - an Experimental and Numerical Study

    Author : John Eriksson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; heat transfer; gluing; twist; drying; wood; timber board; laminated product; FEM; distortion; moisture; mass transfer;

    Abstract : Timber products subjected to climatic variations commonly display moisture-induced distortions that can lead to serious problems for end-users. The aim of the thesis, which consists of an extended summary and six appended papers, was to investigate the potential of using the gluing technique suggested here for dealing with problems of moisture-induced distortions and developing the heat and mass transfer models which such distortion analyses require. READ MORE