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Crack formation due to weathering of radial and tangential sections of pine and spruce.
Växjö university.ORCID iD: 0000-0002-4526-9391
Royal Institute of Technology.
2006 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 1, no 1, p. 12-20Article in journal (Refereed) Published
Abstract [en]

The development of cracks and changes in appearance have been investigated on radial and tangential sections of pine(Pinus sylvestris L.) and spruce (Picea abies Karst.) after exposure outdoors for 61 months. The degradation of the sectionshas also been studied at the micro-level. The annual ring orientation was the most important factor affecting crackdevelopment on weathering. After 61 months of outdoor exposure, the tangential sections of spruce had 1.7/2.2 timesgreater mean total crack length per area unit than the corresponding radial sections. In pine, the total crack length per areaunit on the tangential sections was 2.2/2.6 times greater than that on the radial sections. Tangential and radial sectionsshow the same colour change as a result of weathering. Tangential sections have more and deeper cracks than radial surfaces.The cracks on the tangential sections occur frequently in both earlywood and latewood. On radial sections, cracks occurprimarily at the annual ring borders, but to a certain extent also in the earlywood. Decomposition of the cell wall takes placein both radial and tangential cell walls, and cracks tend to follow the fibril orientation in the S2-layer of the cell wall. Theradial cell wall of the earlywood has a large number of pits which are degraded at an early stage.

Place, publisher, year, edition, pages
2006. Vol. 1, no 1, p. 12-20
Keywords [en]
Forestry, agricultural sciences and landscape planning - Wood fibre and forest products
Keywords [sv]
Skogs- och jordbruksvetenskap samt landskapsplanering - Träfiber- och virkeslära
National Category
Other Mechanical Engineering
Research subject
Wood Technology
Identifiers
URN: urn:nbn:se:ltu:diva-10517DOI: 10.1080/17480270600644407Local ID: 953f9d42-bfa3-4cb4-9e7b-360ab6a09b9eOAI: oai:DiVA.org:ltu-10517DiVA, id: diva2:983462
Note
Upprättat; 2006; 20140903 (dicsan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2020-01-28Bibliographically approved

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Sandberg, Dick

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