Tous les articles par iris-bremaud

Journée 2019 du Groupe Bois de la SFIIC

9ème Journée d’étude du Groupe Bois de la SFIIC (Section Française de l’Institut International de Conservation ) – « Couleurs du bois, support de peinture, bois teintés. » , 11 Octobre 2019, INP (Institut National du Patrimoine), Aubervilliers.

Information et programme de la journée: en suivant ce lien

Présentation d’une conférence:

  • Brémaud, Iris (2019) Colorimétrie des bois: diversité du matériau et complexité à quantifier la perception visuelle.

Revisiting the notion of “resonance wood” choice: a de-compartementalised approach

Newly published Book Chapter:

Carlier Capucine, Alkadri Ahmad, Gril Joseph, Brémaud Iris (2018).

Revisiting the notion of “resonance wood” choice: a decompartementalised approach from violin makers’ opinion and perception to characterization of material properties’ variability.

Full-Text: https://hal.archives-ouvertes.fr/hal-02051004

pp119-141, In: Wooden Musical Instruments: Different Forms of Knowledge (Book of End of WoodMusICK COST Action FP1302), Pérez, M. A. & Marconi, E. (eds.). Philarmonie de Paris.

Abstract: This work aims to improve our understanding of the resonance wood and to investigate the interactions between their physical-mechanical properties, natural variability, and the violin makers’ methods for choosing their materials. In order to identify the luthiers’ practices and opinions, a socio-technical survey was conducted. Physical, vibrational, and visual/structural characteristics of the resonance wood obtained from several provenances with a variety of quality grades were also determined. Finally, these two approaches were completed by a psychosensory evaluation to compare the measurements that we have conducted with the evaluation results made by the violin makers.

2019 World Wood Day – Change

Invited for a Keynote Lecture at World Wood Day 2019 (Austria)

The global event: http://www.worldwoodday.org/

This year’s event: http://www.worldwoodday.org/2019/

The 2019 WWD Symposium and the 2nd IUFRO Forest Products Culture Research Group Colloquium : Program

Keynote Lecture for Topic 3 (Wood-based musical instruments, Art and Design):

  • Brémaud Iris (2019). Connecting wood physics and craftsmanship knowledge to understand biological and cultural diversity in wood choices for instrument making.

Abstract:

Among the biological diversity of forest resources, the choices of wood that has been and is done by humankind for various technical and cultural uses result from complex interactions between traditional knowledge, availability of a resource, and technical and material constraints. Several criteria of wood choice belong to the broad field that can be explicated or quantified by wood physics. However, wood physics is a relatively “young” (circa 150 years?) disciplinary field as compared to the long history of craftsmanship knowledge on wood. Moreover, wood physics studies are most often applied to “industrial” uses, or can be applied to objects of cultural heritage in the scope of conservation science, but seldom only is wood physics connected to understanding traditional or cultural uses of wood in craftsmanship. This presentation will propose some ways in which these often distant fields can be connected. Musical instrument making is an interesting domain to study such connections, as instruments combine high design requirements on both cultural, aesthetical (musical and visual) and physical (acoustical and mechanical) sides. Yet wood in musical instrument making is not a simple field to study, because of the multiplicity of points of view that can be quite different between “actors” (foresters, instrument makers, musicians, public, scientists…), and because the “musical” function often overshadows the other important functions of wood and instruments. This presentation aims to “tell a story” following three interdisciplinary questions: (i) What biological/botanical sources cause variability/diversity in acoustics-related wood properties? (ii)  Which species are chosen among this biological and physical diversity, depending on the cultural (historical or geographical) diversity in musical instrument making? (iii) How do instrument makers select, perceive and qualify the woods that they employ, and which material characteristics are involved in this process? These three topics should contribute to a better understanding of the meaning of “wood choice for instrument making”. This will be put into perspective in a concluding reflection about the involvement of these interconnected aspects in the crisis currently encountered regarding the rarefaction of many preferred woods in instrument making.

36ème Ste Cécile de l’ALADFI 2018

36ème Ste Cécile de l’ALADFI (Association des Luthiers et Archetiers pour le Développement de la Facture Instrumentale) – « Les bois et autres matériaux en lutherie et archèterie » , 7-9 Décembre 2018, Carry-le-Rouet

3 présentations de l’équipe BOIS du LMGC:

  • Brémaud Iris (2018). Etat de l’art des recherches sur les bois de lutherie : focus sur les bois tropicaux
  • Alkadri Ahmad, Brémaud Iris, Langbour Patrick, Gril Joseph, Wahyudi I. (2018). Sur les ondes de l’érable – Relation entre anatomie, mécanique et acoustique
  • Carlier Capucine, Brémaud Iris, Gril Joseph (2018). Sélection des bois de lutherie : relier la caractérisation des propriétés des bois de résonance avec les perceptions des luthiers

Wavy maple anatomy and anisotropic vibrational properties

Alkadri Ahmad, Carlier Capucine, Wahyudi I, Gril Joseph, Langbour Patrick, Brémaud Iris.

Relationships between anatomical and vibrational properties of wavy Sycamore Maple.

IAWA Journal 39(1) : 63-86. (2018)

Full-text: https://hal.archives-ouvertes.fr/hal-01667816

Abstract: Sycamore maple (Acer pseudoplatanus L.) is a wood species particularly known for its wavy grain figure and its high-value utilization among luthiers and craftsmen for making musical instruments or furniture. In this study, the anatomical and physical-acoustical characteristics of its wood, taken from different trees with various surface figures, were characterized. Vibrational mechanical measurements were conducted taking into account radial and longitudinal directions and local variations. Waviness parameters were quantified on split blocks, and anatomical properties such as microfibril angle and ray dimensions were measured using light microscopy. Results provide a complete dataset on the properties of sycamore maple along a gradient of the wavy figure. Through statistical analysis, significant correlations were found between the measured parameters, particularly between the waviness and microfibril angle, and between the anatomical features and the specific modulus of elasticity and damping by internal friction of the wood in the longitudinal direction. Anisotropy was found to be very low but was not satisfactorily explained by the studied anatomical features. Prospects for future studies on the wavy figure are discussed.

Keywords: Acoustic properties, anisotropy, damping, microfibril angle, specific modulus of elasticity, rays, wavy grain.

Symposium 2018 de l’APLG

Symposium de l’APLG (Association Professionnelle des Luthiers Artisans en Guitares et autres cordes pincées), 23-24 Novembre 2018, MontluçonB

Rencontre avec l’APLG en vue de collaboration sur les bois de lutherie guitare, et notamment les Palissandres, et présentation d’une conférence:

  • Brémaud Iris (2018). Les choix de bois en facture instrumentale: des propriétés physiques entre diversités botanique et culturelle