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Poromechanical scale transitions of failure stresses in wood: from the lignin to the spruce level
Vienna University of Technology, Austria.ORCID iD: 0000-0002-7829-4630
Vienna University of Technology, Austria.
Vienna University of Technology, Austria.
Vienna University of Technology, Austria.
2010 (English)In: Zeitschrift für angewandte Mathematik und Mechanik, ISSN 0044-2267, E-ISSN 1521-4001, Vol. 90, no 10-11, 750-767 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Wood strength is highly anisotropic, due to the inherent structural hierarchy of the material. In the framework of a combined random-periodic multiscale poro-micromechanics model, we here translate compositional information throughout this hierarchy into the resulting anisotropic strength at the softwood level, based on “universal” elastic properties of cellulose, hemicellulose, and lignin, and on the shear strength of the latter elementary constituent. Relating, through elastic energy-derived higher-order strains in a poromechanical representative volume element, the (quasi-)brittle failure of lignin to overall softwood failure, results in a macroscopic microstructure-dependent failure criterion for softwood. The latter satisfactorily predicts the biaxial strength of spruce at various loading angles with respect to the grain direction. The model also predicts the experimentally well-established fact that uniaxial tensile and compressive strengths, as well as the shear strength of softwood, depend quasi-linearly on the cell water content, but highly nonlinearly on the lumen porosity.

Place, publisher, year, edition, pages
2010. Vol. 90, no 10-11, 750-767 p.
Keyword [en]
Anisotropic wood material, microstructure, failure stresses, continuum micromechanics, micro-poromechanics, experimental validation, biaxial strength tests.
National Category
Wood Science Composite Science and Engineering
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology; Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-51208DOI: 10.1002/zamm.201000045OAI: oai:DiVA.org:lnu-51208DiVA: diva2:913872
Available from: 2016-03-22 Created: 2016-03-22 Last updated: 2016-03-23Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1002/zamm.201000045

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Bader, Thomas K.
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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