• Aucun résultat trouvé

Beyond « clear wood » : exploring the structure-properties of figured woods and of woods with strong gradients selected in craftsmanship

N/A
N/A
Protected

Academic year: 2021

Partager "Beyond « clear wood » : exploring the structure-properties of figured woods and of woods with strong gradients selected in craftsmanship"

Copied!
2
0
0

Texte intégral

(1)

HAL Id: hal-01955634

https://hal.archives-ouvertes.fr/hal-01955634

Submitted on 14 Dec 2018

HAL is a multi-disciplinary open access

archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Beyond “ clear wood ” : exploring the

structure-properties of figured woods and of woods with strong gradients selected in craftsmanship

Hsien-Tsung Hu, Pierre Cabrolier, Ahmad Alkadri, Capucine Carlier, Joseph Gril, Patrick Langbour, Iris Brémaud

To cite this version:

Hsien-Tsung Hu, Pierre Cabrolier, Ahmad Alkadri, Capucine Carlier, Joseph Gril, et al.. Beyond “ clear wood ” : exploring the structure-properties of figured woods and of woods with strong gradients selected in craftsmanship. 7èmes journées du GDR Sciences du bois, Nov 2018, Cluny, France. �hal-01955634�

(2)

Beyond « Clear Wood »: Exploring the Structure-Properties of Figured

Woods and of Woods with Strong Gradients Selected in Craftsmanship

HU Hsien-Tsung

1,4

, CABROLIER Pierre

1,2

, ALKADRI Ahmad

1,4

, CARLIER Capucine

1

,

GRIL Joseph

1,3

, LANGBOUR Patrick

4

, BREMAUD Iris

1

1Equipe BOIS, LMGC, CNRS, UM, Montpellier 2In the way from wood science to becoming craftsman 3CNRS, Institut Pascal, U. Clermont-Auvergne, Aubières 4BIOWOOEB, CIRAD, Montpellier

hsien-tsung.hu@umontpellier.fr

References

WORK PROJECTs

A.Surveys with craftsmen for the uses of wood with

high gradients of properties and the selection

trade-offs.

B.Establishment of a typology of wood according to

different patterns and usages.

C.Exploration of botanical diversity and variability to

determine the certain singularities and mechanical

characteristics.

D.Reducing the problem according to the typology

of the observation scales relevant for the

multi-scale analysis. Experimental characterization (and

modelling) of the structural mechanical

repercussions in conditions with high gradients of

properties.

E. Study of the visio-tactile sensory perception by

craftsmen, especially for figured woods.

FUTURE WORK

CONTEXT

This poster is to present a beginning Ph.D. research for the study of

wood with artisanal usage with non-straight or heterogeneous.

A paradox between the viewpoints of engineering sciences and of

the artisanal usage for wood is posed:

In natural, homogeneous wood is singularity

From engineering viewpoint, a good quality wood is

orthotropic

(clear wood)

, with homogeneous character.

To the artisanal usage, heterogeneity and/or singularity could be

seemed as defect or quality.

The goal for this program is to fulfil the gap of knowledge of

heterogeneous woods(e.g. figured wood and grain deviation).

• Alkadri, A., C. Carlier, I. Wahyudi, J. Gril, P. Langbour and I. Brémaud (2018). "Relationships between anatomical and vibrational properties of wavy sycamore maple." IAWA Journal 39(1): 63-86

• Brémaud, I. (2016). Vers une vision « ethno-bio-mécanique » des bois - La rhéologie du matériau-bois à lʼinterface entre diversité botanique et usages en lutheries et artisanats. HDR Univ. Montpellier. 149pp

• Cabrolier, P., Description et comportement mécanique des bois contrefilés, 2007, Université Montpellier 2 (Sciences et Techniques)

EXPLORATION

1910

BORTHWICK AW: The production of adventitious roots and their relation to birdʼs-eye formation (Maserholz) in the wood of various trees.

1933

HOLMBERG LH: Is suppression a possible cause of birdʼs-eye in sugar maple?PILLOW MY: Detection of figured wood in standing trees.

1969

CHAFE SC: Dimpled grain in wood.CARLQUIST S: Wood anatomy of Lobelioideae(Campanulaceae).

“Figured wood” appeared in journal of timber industries, veneer, furniture making, commercial brochures, etc., …

1952

BAUMER M: A propos des figures du bois.

1977

BEALS HO & DAVIS TC: Figure in wood: An illustrated review.

1979

HEJNOWICZ Z: The common basis of wood grain figures is the systematicallychanging orientation of cambial fusiform cells.

Anatomy observation, genetic relationship, appearance of figured for CAD are focused on…

Measuring instrument system(

Vybris

) for the dynamic modulus properties, developed in LMGC for a decadeʼs researches of the anisotropic

characteristics for the wood with strong gradients(interlocked grain, wavy grain, curly grain...)

(Brémaud I., 2016) (Modified)

Wood specimen Silk threads Vibration nodes for 1st mode Thin steel Silk threads Electro-magnet Laser sensor

2007

Cabrolier P: Description et comportement mécanique des bois contrefilés

2018

Alkadri A et al: Relationships between anatomical and vibrational properties of wavy sycamore maple

Mechanical properties of micro-specimens; comparing it with the multi-scale prediction and the

further step: macro-scopic behavior

Calculating the ratio of figured tissue and non-figured tissue

Correlation for micro-, meso- and macro-scopic , ( 2 0 1 6) . . 6 2( 6) : 2 8 4 -2 9 2

Using optical and image analysis for the measurement for figured woods Use the parameters from

micro-scopic and meso-micro-scopic scale

transformed to the global behavior

(Cabrolier P., 2006)

Meso-scopic scale of the type of wood with grain deviation

(Alkadri et al., 2018)

Multi-scale Analysis & FEM

Measurement of MFA Micro-scopic scale

(Alkadri et al., 2018)

Wavy Interlocked Birdʼs-eye

http://en.woodtec.co.jp/products/individuality-tree/

7e GDR du BOIS | C

luny, France | 20

-22, Nov, 2018

B7

NOV 20-22 2018

Références

Documents relatifs

These results suggest that global calibration could be useful in tree breeding processes and for different experiment trials from the fields, to rank genotypes for extractives,

Tension wood from the species containing a G- layer was found to have higher damping characteristics than opposite wood from the same species whilst no difference

a) Surveys with craftsmen and possibly with foresters/sawyers to identify the uses of wood with high gradients of properties and the selection trade-offs between

The second, more optimistic view is that the euro area can work as a currency union of sovereign member states if common institutions are created which provide a balance between

Le traitement par ces extraits de plantes a montré un effet en préventif, à l’exception de l’extrait du fenugrec qui n’a pas montré d’effet sur la glycémie en

The purpose of this group, which is operated jointly by the Research Laboratory of Electronics, the Electronic Systems Laboratory, and the Department of

1 https://helpx.adobe.com/after-effects/using/color-correction-effects.html 2 https://digitalanarchy.com/Flicker/main.html.. to correct convincingly color instabilities. Second,

example, Figure 7 shows that a planet with an eccentricity of 0.6 orbiting a 10 −2 L star can always sustain surface liquid wa- ter whereas it cannot do so for the whole orbital