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Comparison of mechanical properties of thermally modified wood at growth ring and cell wall level by means of instrumented indentation tests
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Stefanie Stanzl-Tschegg
Published/Copyright:
June 3, 2009
Abstract
Thermal modification is a well established method to improve the dimensional stability and the durability for outdoor use of wood. Unfortunately, these improvements are usually accompanied with a deterioration of mechanical performance (e.g., reduced strength or higher brittleness). In contrast, our investigations of the hardness properties in the longitudinal direction of beech wood revealed a significant improvement with thermal modification. Furthermore, we applied instrumented indentation tests on different hierarchical levels of wood structure (growth ring and cell wall level) to gain closer insights on the mechanisms of thermal treatment of wood on mechanical properties. This approach provides a variety of mechanical data (e.g., elastic parameters, hardness parameters, and viscoelastic properties) from one single experiment. Investigations on the influence of thermal treatment on the mechanical properties of beech revealed similar trends on the growth ring as well as the on the cell wall level of the wood structure.
Received: 2008-8-18
Accepted: 2009-3-5
Published Online: 2009-06-03
Published in Print: 2009-07-01
©2009 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Original Papers
- 2D-NMR (HSQC) difference spectra between specifically 13C-enriched and unenriched protolignin of Ginkgo biloba obtained in the solution state of whole cell wall material
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 1: Colour evolution and colour changes
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 2: Property predictions from colour changes
- The relationship found between fibre length and viscosity of three different commercial kraft pulps
- High-yield kraft pulping of Eucalyptus grandis Hill ex Maiden biotreated by Ceriporiopsis subvermispora under two different culture conditions
- Analysis of microwave vs. thermally assisted grafting of poly(methyl-vinyl ether co-maleic acid)-polyethylene glycol to birch kraft pulp
- Selective enzyme impregnation of chips to reduce specific refining energy in alkaline peroxide mechanical pulping
- Radical chain reactions in pyrolytic cleavage of the ether linkages of lignin model dimers and a trimer
- Quantitative chemical indicators to assess the gradation of compression wood
- Comparison of mechanical properties of thermally modified wood at growth ring and cell wall level by means of instrumented indentation tests
- Revisiting the transition between juvenile and mature wood: a comparison of fibre length, microfibril angle and relative wood density in lodgepole pine
- Characterization of the wood quality of pernambuco (Caesalpinia echinata Lam) by measurements of density, extractives content, microfibril angle, stiffness, color, and NIR spectroscopy
- An improved drying model for highly-impermeable hardwoods
- Neutron attenuation coefficients for non-invasive quantification of wood properties
- Topochemical investigations of cell walls in developing xylem of beech (Fagus sylvatica L.)
- Effects of substrate on laboratory spalting of sugar maple
- Short Notes
- Apigenin derivatives from Paulownia tomentosa Steud. var. tomentosa stem barks
- Forming limits for the bulk forming of solid wood
- Meetings
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