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Behavior and modeling of wood chips: experiments, constitutive relations and finite element modeling
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main object of this thesis is to find a material model that describes how wood chips respond to consolidation and/or compression during drained or undrained condition. It was found during the literature studies that the constitutive behavior of wood chips could be described by modifying some of the constitutive models from the soil mechanics. The normal stress component is separated into two parts: the stress carried by the wood chip structure and the stress carried by the fluid. An extensive laboratory program for measuring the required plastic and elastic material parameters was performed at Luleå University of Technology, Division of Soil Mechanics, mainly on spruce wood chips. The non-linear elastic part of the deformation was approximately 40 percent of the total deformation. During the experimental phase, it was shown that the chips were arranged perpendicular to the direction of deformation and that the permeability was extremely low in the direction perpendicular to the deformation. It was also demonstrated that a redistribution of the stresses from the axial direction to the radial takes place when the material reaches shear failure.

Place, publisher, year, edition, pages
Keyword [en]
Technology, wood chips, constitutive behavior, compression, permeability, fluid mechanics, solid mechanics
Keyword [sv]
URN: urn:nbn:se:ltu:diva-54794ISRN: LTU-EX--00/012--SELocal ID: bb949417-8eb7-41c1-ba5d-b198dc65037eOAI: diva2:1028176
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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