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Growth layer and fi...
Growth layer and fibre orientation around knots in Norway spruce : a laboratory investigation
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- Hu, Min, 1979- (författare)
- Linnéuniversitetet,Institutionen för byggteknik (BY),Linnéuniversitetet, Institutionen för byggteknik (BY)
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- Briggert, Andreas, 1984- (författare)
- Linnéuniversitetet,Institutionen för byggteknik (BY),Linnéuniversitetet, Institutionen för byggteknik (BY)
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- Olsson, Anders, 1973- (författare)
- Linnéuniversitetet,Institutionen för byggteknik (BY),Linnéuniversitetet, Institutionen för byggteknik (BY)
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- Johansson, Marie, 1973- (författare)
- Linnéuniversitetet,Institutionen för byggteknik (BY),Linnéuniversitetet, Institutionen för byggteknik (BY)
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- Oscarsson, Jan, 1958- (författare)
- Linnéuniversitetet,Institutionen för byggteknik (BY),Linnéuniversitetet, Institutionen för byggteknik (BY)
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- Säll, Harald, 1957- (författare)
- Linnéuniversitetet,Institutionen för skog och träteknik (SOT),Linnéuniversitetet, Institutionen för skog och träteknik (SOT)
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(creator_code:org_t)
- 2017-09-02
- 2018
- Engelska.
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Ingår i: Wood Science and Technology. - : Springer. - 0043-7719 .- 1432-5225. ; 52:1, s. 7-27
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Abstract
Ämnesord
Stäng
- The strength of structural timber largely depends on the occurrence of knots and on the local material directions in the surroundings of such knots. There is, however, a lack of methods for establishing a full dataset of the local material directions. The present research aims at the development and application of a laboratory method to assess the geometry of growth layers and the orientation of fibres in a high-resolution 3D grid within wood specimens containing knots. The laboratory method was based on optical flatbed scanning and laser scanning, the former resulting in surface images and the latter, utilizing the tracheid effect, resulting in in-plane fibre angles determined in high-resolution grids on scanned surfaces. A rectangular solid wood specimen containing a single knot was cut from a tree in such a way that it could be assumed that a plane of symmetry existed in the specimen. By splitting the specimen through this plane through the centre line of the knot, two new specimens with assumed identical but mirrored properties were achieved. On one of the new specimens, the longitudinal-radial plane was subsequently scanned, and the longitudinal–tangential plane was scanned on the other. Then, by repeatedly planing off material on both specimens followed by scanning of the new surfaces that gradually appeared, 3D coordinate positions along different growth layers and 3D orientation of fibres in a 3D grid were obtained. Comparisons between detected fibre orientation and growth layer geometry were used for the assessment of the accuracy obtained regarding 3D fibre orientation. It was shown that the suggested method is well suited to capture growth layer surfaces and that it provides reliable information on 3D fibre orientation close to knots. Such knowledge is of great importance for understanding the properties of timber including knots. The quantitative data obtained are also useful for calibration of model parameters of general models on fibre orientation close to knots.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Trävetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Wood Science (hsv//eng)
Nyckelord
- Forestry and Wood Technology
- Skog och träteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Hu, Min, 1979-
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Briggert, Andrea ...
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Olsson, Anders, ...
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Johansson, Marie ...
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Oscarsson, Jan, ...
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Säll, Harald, 19 ...
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- LANTBRUKSVETENSKAPER
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LANTBRUKSVETENSK ...
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Wood Science and ...
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Linnéuniversitetet
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Jönköping University