Sökning: "Shape stability timber"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden Shape stability timber.

1. 1. Effect of high-temperature drying on spruce and larch Shape stability, mechanical properties and mould growth

   Författare :Eva Frühwald; Avdelningen för Konstruktionsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; twist; shape stability; Norway spruce; mould susceptibility; larch; high-temperature drying; distortion; Technological sciences; Teknik; Material technology; Materiallära; Building construction; materialteknik; heat-treatment; Byggnadsteknik; KSTRWood;

   Sammanfattning : Shape stability, the ability of the wood to retain its shape, is one of the most important parameters when using timber as a building material and for other applications. Generally, timber undergoes changes in dimensions and shape when its moisture content is changed. LÄS MER

3. 2. Genetic improvement of shape stability in Norway spruce and Scots pine sawn timber

   Författare :Henrik Hallingbäck; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : Poor shape stability of sawn softwood timber, causes substantial economic losses for sawmills and the building industry. Sawn timber twist is regarded to be the most severe deformation and has been shown to be controlled by intrinsic wood properties like wood shrinkage and spiral grain angle. LÄS MER

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

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

   Sammanfattning : 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.….…. LÄS MER

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

   Författare :John Eriksson; Chalmers tekniska högskola; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

7. 5. Pith location and annual ring detection for modelling of knots and fibre orientation in structural timber : A Deep-Learning-Based Approach

   Författare :Tadios Habite; Anders Olsson; Osama Abdeljaber; Jan Oscarsson; Welf Löwe; Julie Cool; Linnéuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sawn timber; Pith location; Deep learning; Artificial neural networks; Convolutional neural network; Conditional generative adversarial network; Knot detection; Knot modelling; Knot reconstruction; Fibre orientation; Annual ring profile; Byggteknik; Civil engineering;

   Sammanfattning : Detection of pith, annual rings and knots in relation to timber board cross-sections is relevant for many purposes, such as for modelling of sawn timber and for real-time assessment of strength, stiffness and shape stability of wood materials. However, the methods that are available and implemented in optical scanners today do not always meet customer accuracy and/or speed requirements. LÄS MER