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On the importance of fatigue for the rheological properties of wood
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (Mekanisk Fiberteknologi)ORCID iD: 0000-0003-3381-5516
KCL, Helsinki, Finland.
Helsinki University, Finland.
Tampere University of Technology.
2009 (English)In: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009, 2009, p. 239-244Conference paper, Published paper (Refereed)
Abstract [en]

In this study the rheological properties of both native and fatigued wood was quantified under conditions relevant to mechanical pulping. This work was part of a Nordic cooperation project on "Basic phenomena in mechanical pulping. The new knowledge is intended to give us guidance on process development in mechanical pulping. The recent EES-concept [1] is assumed to offer low specific energy consumption mostly because of wood fatigue. A modulated loading device (MLD) developed at KCL was here used to fatigue wood samples. The samples were then evaluated by impulsive loading experiments carried out in an encapsulated Split-Hopkinson device (ESHD) developed at Mid Sweden University. Impulsive loadings, which extended to the non-elastic deformation region, were performed at four temperatures: 20, 65, 100 and 135°C. A higher testing temperature softened the wood samples to a high extent as could be expected. The results show that the reference samples (that was not subjected to fatigue treatment) had the highest stiffness in the investigation. The stress-strain curves of the fatigued samples were less steep, which indicate a softer more loosened material. It was evident that the fatigue treatment had loosened or weakened the wood material considerably and the differences were most pronounced at the two lowest testing temperatures.

 

 

Place, publisher, year, edition, pages
2009. p. 239-244
Keywords [en]
Impulsive loading; Loading devices; Low specific energy; Mechanical pulping; Process development; Rheological property; Split-Hopkinson; Testing temperature; Wood materials; Wood samples
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-11015Scopus ID: 2-s2.0-77951108305OAI: oai:DiVA.org:miun-11015DiVA, id: diva2:285411
Conference
2009 International Mechanical Pulping Conference, IMPC 2009; Sundsvall; 31 May 2009 through 4 June 2009; Code 79937
Available from: 2010-01-11 Created: 2010-01-11 Last updated: 2010-06-14Bibliographically approved

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Engberg, Birgitta Anna

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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
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  • asciidoc
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