Characterisation and categorisation of the diversity in viscoelastic vibrational properties between 98 wood types

Abstract

International audienceContext Increased knowledge on diversity in wood properties would have implications both for fundamental research and for promoting a diversification of uses as material. *Aims The objective is to contribute to overcoming the critical lack of data on the diversity of wood dynamic mechanical/viscoelastic vibrational properties, by testing lesser-known species and categorizing sources of variability. *Methods Air-dry axial specific dynamic modulus of elasticity (E'/γ) and damping coefficient (tanδ) were measured on a wide sampling (1792 specimens) of 98 wood types from 79 species. An experimental device and protocol was designed for conducting systematic (i.e. rapid and reproducible) characterizations. *Results Diversity at the specimens' level corroborates the "standard" relationship between tanδ and E'/γ, which is discussed in terms of orientation of wood elements and of chemical composition. Diversity at the species level is expressed on the basis of results for normal heartwood, with specific gravity (γ) ranging from 0.2 to 1.3. Axial E'/γ ranges from 9 to 32 GPa and tanδ from 4×10-3 to 19×10-3. Properties distribution follows a continuum, but with group characteristics. The lowest values of tanδ are only found in certain tropical hardwoods. Results can also suggest alternative species for musical instruments making

Relationships between anatomical and vibrational properties of wavy sycamore maple

“…Results from the vibrational measurements on all specimens show that, overall, the relationship between tanδ and E'/ρ of sycamore maple ( Figure 7) follows a trend similar to the "standard" relationship established on numerous species (Ono and Norimoto 1983;Brémaud et al 2012).…”

“…this study with the "standard" relationship established on numerous species (Ono & Norimoto 1983;Brémaud et al 2012). Further analysis on local variations also shows that, along the trunk's radius, E' L /ρ tends to increase and tanδ L to decrease the further the wood is from the pith (Figure 8 (Brémaud 2012).…”

The effect of traditional hygro-thermal pretreatments on the acoustical characteristics of white mulberry wood (Morus alba)

“…Obataya et al 2000). The employed device and testing procedure are described in detail in Brémaud et al 2012.…”

Módulo de rigidez y módulo dinámico de la madera de Acer saccharum Marshall y Thuja plicata L.

“…Esta valoración tecnológica de la madera, encuentra aplicación práctica en la fabricación de instrumentos musicales (Brémaud, El Kaïm, Guibal, Minato, Thibaut & Gril, 2012) y en productos de madera de alto valor agregado (Walker, 2006). Algunas de las funciones principales de los componentes de madera en un instrumento musical, son la radiación del sonido y la capacidad de deformación en condiciones de vibración (Roohnia, Tajdini & Manouchehri, 2011).…”