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Agglomerations in Cellulose Fibre Reinforced Plastic Composite: A Micromechanical Model
Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering. (Woodfibre3D)
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This Degree project was performed by a Master’s student from Karlstad University and conducted at the Royal Institute of Technology during the spring of 2010. The project was performed as part of the Nordic project WoodFibre3D which is aimed to increase the technology intensity in the Swedish paper and forest products. Scientists from all over the Nordic region cooperate in the project. The aim of this study was to investigate how agglomerations of different cellulose pulp fibres reduce the ultimate tensile strength of cellulose fibre composite. In this particular sub project of the WoodFibre3D, the defects of injection moulded cellulose fibre composites were investigated. Defects such as fibre agglomerations are formed during manufacture. These agglomerations give rise to a heterogeneous stress fields, with stress concentrations at the agglomeration-matrix interfaces. Precursor and injection mould the raw material were produced to standardised test pieces. The test pieces were then scanned by x-ray microtomography followed by image analysis to segment matrix, fibres, agglomerations and voids in high resolution three dimensional digital images. After the scanning the test pieces were broken by tensile test before a second x-ray scan and fracture surface analysis. Agglomerations resemble triaxial arbitrarily oriented ellipsoids. For the ellipsoids the stress concentration is calculated iteratively in terms of maximum principal stress. Ellipsoids are also calculated in terms of stress intensity by assuming sharp crack like behaviour. Fracture analysis and micromechanical models showed a clear correlation between strength and the stress intensity of the large agglomerations in the composite. For stress concentration factor the micromechanical model was unable to identify any correlation. No vast systems of small agglomerations were found to cause failure.

Place, publisher, year, edition, pages
2010. , 35 p.
Keyword [en]
Agglomerations, Cellulose Fibre Reinforced, Plastic Composite, Micromechanical Model, WoodFibre3D, x-ray microtomography
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-11982Local ID: MSK-21OAI: oai:DiVA.org:kau-11982DiVA: diva2:507371
Subject / course
Materials Engineering
Presentation
2010-06-01, Karlstad, 16:45 (English)
Uppsok
Technology
Supervisors
Examiners
Projects
WoodFibre3D
Available from: 2012-03-09 Created: 2012-03-04 Last updated: 2015-11-09Bibliographically approved

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  • apa
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