Comptes Rendus
no. 7
Mechanical characteristics of aged Hinoki wood from Japanese historical buildings
[Propriétés mécaniques du bois de Hinoki ancien provenant de bâtiments historiques japonais]
Misao Yokoyama1  ; Joseph Gril1, 2 ; Miyuki Matsuo1 ; Hiroyuki Yano1 ; Junji Sugiyama1 ; Bruno Clair2 ; Sigeru Kubodera3 ; Takumi Mistutani3 ; Minoru Sakamoto4 ; Hiromasa Ozaki4 ; Mineo Imamura4 ; Shuichi Kawai1
1 Research Institute for Sustainable Humanoshere, Kyoto University, Gokasho Uji-shi, Kyoto 611-0011, Japan
2 Laboratoire de mécanique et génie civil, université Montpellier 2, CNRS, cc 048, place Eugène-Bataillon, 34095 Montpellier cedex 5, France
3 National Research Institute for Cultural Properties, Nara, 2-9-1 Nijyo-cho, Nara-shi, Nara 630-8577, Japan
4 National Museum of Japanese History, The National Institute for Humanities, 117-Jonai-cho, Sakura-shi, Chiba 285-8502, Japan
Comptes Rendus. Physique, Physics and heritage, Volume 10 (2009) no. 7, pp. 601-611.

Le bois est present dans de nombreux objets du patrimoine en bois du Japon du fait de sa capacité à résister sur de longues durées. Toutefois, l'évolution de ses propriétés en usage demeure insuffisamment connue. La présente étude sur l'effet du vieillissement du bois tire parti du contexte japonais où les traditions constructives ont été maintenues depuis des siècles. Les essais de flexion 3 points ont été réalisés dans les directions longitudinale (L) et radiale (R) sur de petits échantillons de bois issus de 8 prélèvements historiques et d'une référence moderne considérée de la meilleure qualité par des restaurateurs. Bien que le bois âgé semble plus rigide et plus résistant que le bois récent, après correction sur la densité et l'humidité d'équilibre aucune variation significative de rigidité L et R, ni de résistance L n'est observée. Le comportement post-linéaire est par contre fortement influencé par l'âge du bois surtout dans la direction R où résistance et énergie de rupture décroissent fortement avec l'âge du bois, compté depuis l'âge d'abattage estimé. Le bois âgé en bon état de conservation peut être considéré comme sûr tant qu'il n'est pas sollicité perpendiculairement aux fibres.

Wood is present in many cultural heritage objects in Japan thanks to its capacity to resist over a long period of time. However, the evolution of its properties in regular use remains insufficiently known. The present study on the effect of wood aging takes advantage of the Japanese context where building traditions have been maintained for centuries. 3-point bending tests were performed in longitudinal (L) and radial (R) directions on small clear wood specimens cut from 8 historical samples and one modern reference considered of high quality by craftsmen. Although aged wood appeared more rigid and stronger than recent wood, after density and humidity corrections were applied no significant variation of L and R rigidity or L strength was observed. The post-linear behaviour, however, was drastically influenced by wood age especially in R direction where the strength and rupture energy decreased markedly with the time elapsed since the wood was processed. Well preserved aged wood considered as safe as long as it is not loaded perpendicular to grain.

Publié le :
DOI : 10.1016/j.crhy.2009.08.009
Keywords: Aged wood, Hinoki (Chamaecyparis obtusa), Horyu-ji temple, Mechanical properties, Density
Mots-clés : Bois âgé, Hinoki (Chamaecydeparis obtusa), Horyu-ji, Propriétés mécaniques, Masse volumique

Misao Yokoyama 1 ; Joseph Gril 1, 2 ; Miyuki Matsuo 1 ; Hiroyuki Yano 1 ; Junji Sugiyama 1 ; Bruno Clair 2 ; Sigeru Kubodera 3 ; Takumi Mistutani 3 ; Minoru Sakamoto 4 ; Hiromasa Ozaki 4 ; Mineo Imamura 4 ; Shuichi Kawai 1

1 Research Institute for Sustainable Humanoshere, Kyoto University, Gokasho Uji-shi, Kyoto 611-0011, Japan
2 Laboratoire de mécanique et génie civil, université Montpellier 2, CNRS, cc 048, place Eugène-Bataillon, 34095 Montpellier cedex 5, France
3 National Research Institute for Cultural Properties, Nara, 2-9-1 Nijyo-cho, Nara-shi, Nara 630-8577, Japan
4 National Museum of Japanese History, The National Institute for Humanities, 117-Jonai-cho, Sakura-shi, Chiba 285-8502, Japan 
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     title = {Mechanical characteristics of aged {Hinoki} wood from {Japanese} historical buildings},
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Misao Yokoyama; Joseph Gril; Miyuki Matsuo; Hiroyuki Yano; Junji Sugiyama; Bruno Clair; Sigeru Kubodera; Takumi Mistutani; Minoru Sakamoto; Hiromasa Ozaki; Mineo Imamura; Shuichi Kawai. Mechanical characteristics of aged Hinoki wood from Japanese historical buildings. Comptes Rendus. Physique, Physics and heritage, Volume 10 (2009) no. 7, pp. 601-611. doi : 10.1016/j.crhy.2009.08.009. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2009.08.009/

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