Physical, vibro-mechanical and optical properties of pernambuco in relation to bow-making qualitative evaluation and wood diversity

IF 2.2 3区 农林科学 Q2 FORESTRY Holzforschung Pub Date : 2024-08-13 DOI:10.1515/hf-2023-0112
Iris Brémaud
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Abstract

Pernambuco is the archetypal wood in modern bows of the violin-family. This species (Paubrasilia echinata) is endangered. Existing literature suggests remaining questions on how its properties’ variability relates to qualification in bow-making, and to diversity. Here 61 pernambuco specimens, with various qualitative evaluations by makers, are characterised for physical, elastic, dynamic, and optical properties. Results are compared with standard relations between-properties, and with 53 pre-selected tropical hardwoods. The tested pernambuco stands in the medium-upper range of these pre-selected species for density (ρ) and modulus of elasticity (E). It is exceptional for its very low damping coefficient (tanδ) and very intense colour (red a*, yellow b* and chroma C*). Within-species variability is high. Qualification is mostly associated to ρ, colour hue angle h° and gloss, then to elasticity – but E and E/ρ (specific modulus) overlap between groups. Qualification involves appearance (L*, h°, gloss) when freshly cut, and with anticipation of changes after ageing or finishing. The properties (damping, chroma) that make pernambuco exceptional among species, are not clearly related to the qualification within the studied sampling. Analyses help better understand the specificities of pernambuco, and highlight the multifactorial nature of wood selection at two levels: between-species preference, and within-species qualification.
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与制弓质量评估和木材多样性有关的pernambuco的物理、振动机械和光学特性
伯南布哥木是小提琴家族现代琴弓的典型木材。该树种(Paubrasilia echinata)已濒临灭绝。现有的文献表明,它的特性变化与琴弓制作的资质和多样性之间的关系仍然存在问题。在此,我们根据制作者的不同定性评价,对 61 个pernambuco 样品的物理、弹性、动态和光学特性进行了描述。结果与标准特性之间的关系进行了比较,并与 53 种预先选定的热带硬木进行了比较。经测试的pernambuco木在密度(ρ)和弹性模量(E)方面处于这些预选木种的中上水平。它的特殊之处在于阻尼系数(tanδ)非常低,颜色非常鲜艳(红色 a*、黄色 b* 和色度 C*)。品种内的变异性很高。质量主要与 ρ、色调角 h°和光泽度有关,然后与弹性有关 - 但 E 和 E/ρ(比模量)在不同组别之间有重叠。鉴定涉及新切割时的外观(L*、h°、光泽度),以及老化或加工后的预期变化。在所研究的抽样中,使pernambuco 在各种木材中脱颖而出的特性(阻尼、色度)与质量没有明显的关系。分析结果有助于更好地理解pernambuco的特殊性,并从两个层面强调了木材选择的多因素性质:品种间的偏好和品种内的资质。
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来源期刊
Holzforschung
Holzforschung 工程技术-材料科学:纸与木材
CiteScore
4.60
自引率
4.20%
发文量
83
审稿时长
3.3 months
期刊介绍: Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.
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