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Stress-strain relationships for spruce wood: Influence of strain rate, moisture content and loading direction
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2004 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 44, no 1, 44-48 p.Article in journal (Refereed) Published
Abstract [en]

The influence of strain rate, moisture content and loading direction on the stress-strain relationships for spruce wood has been investigated. The strain rates were approximately 8 x 10(-3) s(-1), 17 s(-1) and 1000 s(-1), and the states of moisture content were those corresponding to oven dry, fiber saturated and fully saturated. Compressive loads were applied along the principal directions of the stem of the tree, i.e., radially, tangentially and axially. The low and medium strain-rate tests were performed with the aid of a servohydraulic testing machine, while the high strain-rate tests were carried out using the split Hopkinson pressure bar (SHPB) technique. Magnesium or steel bars were used in the different SHPB tests in order to reduce impedance mismatch for the different directions of the wood specimens. The strain rate was found to have large influence on the behavior of the wood, especially under the condition of full saturation, where water transport in the deforming specimen is of major importance.

Place, publisher, year, edition, pages
2004. Vol. 44, no 1, 44-48 p.
Keyword [en]
spruce wood, strain rate, moisture content, split Hopkinson, thermomechanical pulping
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:miun:diva-13506DOI: 10.1177/0014485104039748ISI: 000188607100007OAI: oai:DiVA.org:miun-13506DiVA: diva2:409610
Available from: 2011-04-08 Created: 2011-04-08 Last updated: 2011-05-29Bibliographically approved

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