Modelling longitudinal elastic an shrinkage properties of wood

Koponen, Seppo; Toratti, Tomi; Kanerva, Pekka

doi:10.1007/bf00350607

Cited by 50 publications

(37 citation statements)

References 6 publications

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“…Noticeable differences in shrinkage could be recognized between MW and JW. Those agree with the differences in MfA as could be expected from the reinforced matrix theory discussed above (Barber and Meylan 1964, Cave 1972, Barrett et al 1972, Koponen et al 1989, Yamamoto 1999 MW and JW was not mirrored by the FTIR CW-indicator, which gave similar values for both wood types. Density (data not shown) was higher for MW than JW samples.…”

Section: Resultssupporting

confidence: 84%

“…These include the microfibril angle (MfA) (Koehler 1931, Barber andMeylan 1964), the angle at which the cellulose fibrils wind in the tracheid cell walls, as well as the physical properties of the surrounding matrix. Theoretical models describing the influence of the MfA on the TS and LS have been developed based on a hygroscopic isotropic matrix consisting of hemicelluloses and lignin which is reinforced with rigid cellulose fibrils (Barber and Meylan 1964, Barrett et al 1972, Cave 1972, Koponen et al 1989, Yamamoto 1999. These theoretical models, refined over the years (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Wood shrinkage: influence of anatomy, cell wall architecture, chemical composition and cambial age

et al. 2009

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Wood shrinkage: influence of anatomy, cell wall architecture, chemical composition and cambial age

et al. 2009

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“…7b). This could be explained by the difference in microfibrillar angle between S 2 and G-layers, as has been observed and modelled for softwoods [32,49], but also by differences in chemical composition or other structural features. A comprehensive model relating the macroscopic behaviour in the L direction to the parameters of cell wall composition (e.g., [60]) would be required to analyse these relationships more deeply.…”

Section: Growth Stress/physico-mechanical Propertiesmentioning

confidence: 75%

Relationships between growth stress and wood properties in poplar I-69 (Populus deltoides Bartr. cv. “Lux” ex I-69/55)

et al. 2008

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-Six inclined poplar I-69 (Populus deltoids cv. I-69/55) trees were collected for studying the influence of growth stress level on wood properties. Growth stress indicator (GSI) was measured at eight positions around the periphery of each trunk at breast height and corresponding wood samples were obtained. Wood anatomical, physico-mechanical and chemical characteristics were measured, including cell diameter, fibre length, double wall thickness excluding the gelatinous layer, lumen diameter after gelatinous layer removal, proportion of wood tissues, basic density, FSP, MOE, compressive strength, shrinkage and chemical composition. Each property was regarded and discussed in relation to the growth stress level. Populus deltoids

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“…Différents modèles ont été proposés pour décrire l'anisotropie élastique pariétale à partir des propriétés élastiques des constituants de la paroi et de l'AMF ϕ. Ils considèrent généra-lement la juxtaposition de deux parois, appartenant respectivement à deux cellules adjacentes [1,4,7,8,14], Norimoto 1986 dans [15,23,24], prenant éventuellement en compte les sous couches S 1 et une lamelle mitoyenne M. Les couches externes du multicouche, représentatives des sous couches S 2 , sont à fibres inclinées à ± ϕ par rapport à l'axe cellulaire (Fig. 1).…”

Section: La Paroi Cellulaire Renforcée Par Des Microfibrilles Orientéesunclassified

Paramètres structuraux et/ou ultrastructuraux facteurs de la variabilité intra-arbre de l’anisotropie élastique du bois

Guitard

Gachet

2004

Ann. For. Sci.

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Résumé -La simulation de l'anisotropie élastique d'un bois résineux sans défaut est réalisée par empilement de trois échelles de descriptions, faisant passer successivement du niveau de la paroi cellulaire, à celui de chacun des tissus ligneux et enfin au niveau du cerne. Les modèles micromécaniques utilisés à chaque étape restent basés sur la recherche du solide élastique homogène équivalent, par des lois des mélanges simples appliquées à des assemblages série ou parallèle de sous domaines supposés homogènes. Un jeu utile de 17 paramètres réalistes, en regard de données bibliographiques variées, est optimisé sur la base des données caractéristiques élastiques anisotropes du « résineux standard ». L'outil de modélisation est adapté à l'analyse de la sensibilité des propriétés élastiques à la variabilité des paramètres adoptés bien que s'éloignant quelque peu de la stricte réalité ultrastructurale. Une originalité réside dans la schématisation de la paroi cellulaire en une couche unique, renforcée par un squelette de microfibrilles, dont l'orientation est empruntée à l'angle des microfibrilles de la sous couche S 2 ; le caractère rigidifiant du squelette, par comparaison à une structure renforcée par des fibres parallèles traduit les renforcements transverses de la paroi, le plus souvent imputés aux sous couches S 1 et S 3 . bois / anisotropie / élasticité / micromécanique / ultrastructureAbstract -Structural and/or ultrastructural parameters governing the variability inside the tree of the elastic anisotropy of wood. Three levels of modelling are introduced to simulate the elastic anisotropy of solid clear softwood, from the cell wall level, via wooden tissues, to the annual ring level. The micro-mechanical models used, at each step, are based on the homogeneous elastic equivalent solid method. Quite simple mixture laws are used for series or parallels assembling of two assumed homogeneous media. 17 realistic parameters are identified by optimisation on the base of given orthotropic elastic properties of the "standard softwood". The modelling tool allows analysing the sensibility of elastic parameters to the variability of internal structural parameters even if it doesn't express quite the ultrastructural reality. One of the originalities is include in cellular wall schematization by a unique layer, reinforcing by a microfibrille skeleton, in which the microfibrillar orientation belongs to S 2 layer. The stiffening of this skeleton, in front of a structure with parallels fibers, represents the cell walls tranverses reinforcements generally assigned to S 2 and S 3 layers.wood / anisotropy / elasticity / micro mechanics / ultrastructure

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Modelling longitudinal elastic an shrinkage properties of wood

Cited by 50 publications

References 6 publications

Wood shrinkage: influence of anatomy, cell wall architecture, chemical composition and cambial age

Wood shrinkage: influence of anatomy, cell wall architecture, chemical composition and cambial age

Relationships between growth stress and wood properties in poplar I-69 (Populus deltoides Bartr. cv. “Lux” ex I-69/55)

Paramètres structuraux et/ou ultrastructuraux facteurs de la variabilité intra-arbre de l’anisotropie élastique du bois

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