dorsal/arxiv
View SchemaReduction of wood hygroscopicity and associated dimensional response by repeated humidity cycles
| Authors | Luis García Esteban, Joseph Gril, Paloma De Palacios De Palacios, Antonio Guindeo Casasús |
|---|---|
| Categories | |
| ArXiv ID | physics/0503174 |
| URL | https://arxiv.org/abs/physics/0503174 |
| Journal | Annals of Forest Science 62, 3 (2005) 275-284 |
Abstract
The reduction of wood response to variations of ambient humidity, described as kind of ageing, has been studied from both points of view of moisture uptake and dimensional changes. Clearwood specimens from 3 gymnosperms (Pinus sylvestris L., Pinus pinaster Ait., Pinus insignis Dougl.) and 4 angiosperms (Populus spp., Quercus pyrenaica Willd., Entandrophragma cylindricum Sprague, Chlorophora excelsa Benth. & Hook f.) were subjected to five wet-dry cycles and their moisture content and dimensional changes in radial and tangential direction at three increasing levels of relative humidity (57.6, 84.2 and 90.2%) were measured before and after the treatment. For a given increase of relative humidity, a coefficient of hygroscopic ageing was defined as the relative decrease of moisture uptake, and the coefficient of dimensional ageing as the difference of swelling strain before and after ageing. All species exhibited a clear ageing effect, much stronger in the wet range than in the dry range. Calculation of swelling coefficients suggested that in some cases the relation between swelling strain and moisture content is no longer linear in aged wood.
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"abstract": "The reduction of wood response to variations of ambient humidity, described\nas kind of ageing, has been studied from both points of view of moisture uptake\nand dimensional changes. Clearwood specimens from 3 gymnosperms (Pinus\nsylvestris L., Pinus pinaster Ait., Pinus insignis Dougl.) and 4 angiosperms\n(Populus spp., Quercus pyrenaica Willd., Entandrophragma cylindricum Sprague,\nChlorophora excelsa Benth. \u0026 Hook f.) were subjected to five wet-dry cycles and\ntheir moisture content and dimensional changes in radial and tangential\ndirection at three increasing levels of relative humidity (57.6, 84.2 and\n90.2%) were measured before and after the treatment. For a given increase of\nrelative humidity, a coefficient of hygroscopic ageing was defined as the\nrelative decrease of moisture uptake, and the coefficient of dimensional ageing\nas the difference of swelling strain before and after ageing. All species\nexhibited a clear ageing effect, much stronger in the wet range than in the dry\nrange. Calculation of swelling coefficients suggested that in some cases the\nrelation between swelling strain and moisture content is no longer linear in\naged wood.",
"arxiv_id": "physics/0503174",
"authors": [
"Luis Garc\u00eda Esteban",
"Joseph Gril",
"Paloma De Palacios De Palacios",
"Antonio Guindeo Casas\u00fas"
],
"categories": [
"physics.class-ph",
"cond-mat.mtrl-sci",
"q-bio.TO"
],
"journal_ref": "Annals of Forest Science 62, 3 (2005) 275-284",
"title": "Reduction of wood hygroscopicity and associated dimensional response by repeated humidity cycles",
"url": "https://arxiv.org/abs/physics/0503174"
},
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