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Mechanical properties of materials made of nano-cellulose
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Recent experimental findings have demonstrated great mechanical properties of nanopaper compared to ordinary paper. In this work, we have studied the formation of the elastic modulus of paper. Our goal was to investigate the contribution of fibers, fiber bonds and network structure.

A 2D finite element network model was developed to study the elastic properties of nanopaper. The model can handle very dense networks of large sizes. Networks were composed of bonded, curved and randomly oriented fibers. The fiber interaction was modeled with a bonding contact. The numerical analysis was compared with theoretical models available in the literature and experimental measurements.

Analysis showed that the fiber stiffness, density and the aspect ratio are the most influential parameters of those investigated with dense isotropic networks. The bond activation and fiber curl affect the modulus only in relatively sparse networks.

Abstract [sv]

Aktuella experimentella mätresultat visar att "nanopapper" (papper som är gjort av nanocellulosa) kan ha överlägsna mekaniska egenskaper jämfört med ett vanligt papper. I detta arbete har vi studerat hur de elastiska egenskaperna hos nanopapper påverkas av fibrer, fiberinteraktioner och pappersstruktur.

En 2D finit-element modell har utvecklats för att studera de elastiska egenskaperna hos nanopapper. Modellen kan analysera mycket stora pappersark med hög densitet. Papperet representerades med krökta slumpmässigt ordnade fibrer bundna till varandra. Interaktionen mellan fibrerna modellerades kontakten mellan fibrerna modellerades med en penalty-metod. Resultaten från numeriska beräkningar jämfördes med olika teoretiska modeller och experimentella mätningar.

Analysen visade att fiberstyvhet, densitet och fiberstorleksförhållandet är de enda av de undersökta parametrarna som påverkade de elastiska egenskaperna hos isotropt nanopapper med hög densitet. Så kallad "bindningsaktivering" och fibrernas krökning påverkade E-modulen bara hos ett relativt glest papper.

Place, publisher, year, edition, pages
2011.
Keyword [en]
nano-cellulose, paper mechanics
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-29581OAI: oai:DiVA.org:kth-29581DiVA: diva2:396162
Presentation
Seminarierummet, Osquars backe 1, Stockholm (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-04-14 Created: 2011-02-09 Last updated: 2011-05-13Bibliographically approved

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