scholarly journals An African violin – The feasibility of using indigenous wood from southern Africa as tonewood

2021 ◽  
Vol 117 (11/12) ◽  
Author(s):  
Martina Meincken ◽  
Gerhard Roux ◽  
Thomas Niesler
Keyword(s):  
Mechanical Properties ◽  
Southern Africa ◽  
Wood Species ◽  
Physical And Mechanical Properties ◽  
Relative Magnitude ◽  
The Body ◽  
String Instruments ◽  
Classification Schemes ◽  
Wind Instrument ◽  
Audio Recordings

The wood used to make musical instruments needs to have particular properties. Depending on its function, such as a soundboard for string instruments or the body of a wind instrument, different properties are desirable to obtain the best musical quality. Several different classification schemes exist that correlate physical and mechanical properties of wood to define desirable ranges for tonewoods, and to allow suitable wood species to be chosen. The physical and mechanical properties of various wood species indigenous to southern Africa were characterised and then assessed in terms of their suitability for violin construction using these classification schemes. The results of this analysis show that the most suitable of the wood species assessed are yellowwood and sapele. These were subsequently used by a professional luthier to build an ‘African’ violin. The sound quality of this instrument was determined subjectively through performances to an audience and more objectively via spectral analysis of audio recordings. This analysis shows clear differences in the relative magnitude of the harmonics between the violin made from indigenous wood and an instrument made with conventional wood species. Despite the differences, yellowwood and sapele were found to be suitable tonewoods, resulting in an instrument with a unique sound.

Influence of provenance on physical and mechanical properties of Angelim-pedra (Hymenolobium petraeum Ducke.) wood species

2021 ◽  
Author(s):  
Julia Naves Teixeira ◽  
Anderson Renato Vobornik Wolenski ◽  
Vinicius Borges de Moura Aquino ◽  
Tulio Hallak Panzera ◽  
Diogo Aparecido Lopes Silva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wood Species ◽  
Physical And Mechanical Properties

scholarly journals LAMINAR INCLUSION IN SUGARCANE BAGASSE PARTICLEBOARD

CERNE ◽  
2017 ◽  
Vol 23 (2) ◽  
pp. 153-160
Author(s):  
Stefania Lima Oliveira ◽  
Ticyane Pereira Freire ◽  
Tamires Galvão Tavares Pereira ◽  
Lourival Marin Mendes ◽  
Rafael Farinassi Mendes
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Sugarcane Bagasse ◽  
Wood Species ◽  
Sugar Cane ◽  
Physical And Mechanical Properties ◽  
Pressure Level ◽  
Sugar Cane Bagasse

ABSTRACT The objective of this study is to assess the effect of the laminar inclusion on the physical and mechanical properties of sugarcane bagasse particleboard. We used the commercial panels of sugarcane bagasse produced in China. To evaluate the effect of the laminar inclusion was tested two wood species (Pinus and Eucalyptus) and two pressures (10 and 15 kgf.cm-2) along with a control (without laminar inclusion). The panels with laminar inclusion obtained improvements in the physical properties, with a significant reduction in the WA2h, WA24h and TS2h. There was a significant increase in the properties MOE and MOR parallel and Janka hardness, while the properties MOE and MOR perpendicular decreased significantly. The pinus and eucalyptus veneers inclusion resulted in similar results when added to the panel with a 10 kgf.cm-2 pressure. The use of 15 kgf.cm-2 pressure is not indicated for the pinus veneer inclusion in sugar cane bagasse panels. There was no effect of the pressure level when evaluating the eucalyptus veneer inclusion on the properties of the sugarcane bagasse panels.

WOOD SELECTION OF ANCIENT TEMPLES IN THE SIKKIM HIMALAYAS

IAWA Journal ◽  
2014 ◽  
Vol 35 (4) ◽  
pp. 444-462 ◽  
Author(s):  
Mechtild Mertz ◽  
Sangeeta Gupta ◽  
Yutaka Hirako ◽  
Pimpim de Azevedo ◽  
Junji Sugiyama
Keyword(s):  
Mechanical Properties ◽  
Wood Species ◽  
Physical And Mechanical Properties ◽  
Eastern Himalayas ◽  
Buddhist Temple ◽  
Building Type ◽  
Indian State ◽  
Religious Considerations ◽  
Selection Of

Microscopic wood identifications were performed on five Buddhist temple structures and on one secular building located in Sikkim, an Indian state in the Eastern Himalayas. In all, twenty wood species were identified, two of which – Michelia (Magnolia) doltsopa and Picea cf. spinulosa – were considered in more detail. Building type, specific physical and mechanical properties of the wood species, local availability, and religious considerations were apparently the leading criteria for timber selection.

scholarly journals Influence of the Procurement Site on Physical and Mechanical Properties of Cupiúba Wood Species

BioResources ◽  
2018 ◽  
Vol 13 (2) ◽  
Author(s):  
Carlos Eduardo Gomes da Silva ◽  
Diego Henrique De Almeida ◽  
Tiago Hendrigo De Almeida ◽  
Eduardo Chahud ◽  
Luiz Antonio Melgaço Nunes Branco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wood Species ◽  
Physical And Mechanical Properties

Ultrasound to estimate the physical-mechanical properties of tropical wood species grown in an agroforestry system

Holzforschung ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Adriano Reis Prazeres Mascarenhas ◽  
Rafael Rodolfo de Melo ◽  
Alexandre Santos Pimenta ◽  
Diego Martins Stangerlin ◽  
Fernando Luiz de Oliveira Corrêa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wood Species ◽  
Basic Density ◽  
Physical And Mechanical Properties ◽  
Agroforestry System ◽  
Coefficient Of Determination ◽  
Linear Regression Models ◽  
Tropical Wood ◽  
African Mahogany ◽  
Adult Trees

Abstract The great diversity of tropical wood species makes it difficult to obtain information about their technological properties. The present work employed ultrasound to estimate the physical and mechanical properties of four wood species: African mahogany (Khaya senegalensis), ‘freijó’ (Cordia goeldiana), ‘paricá’ (Schizolobium amazonicum), and teak (Tectona grandis). Nineteen-year-old adult trees were selected and harvested from an agroforestry system (AFS) located in the Brazilian Amazon. From the harvested trees, 1.5 m logs were sawn and test specimens were obtained for physical-mechanical assays. The ultrasound propagation speed (V 0) and the dynamic modulus of elasticity (E d ) were obtained from applying ultrasound longitudinally in wood samples. Values of V 0 decreased from the lightest wood (paricá) to the heaviest (African mahogany), and E d presented the opposite behavior. For the physical properties, the coefficient of determination (R 2) ranged from 12 to 35% and the best linear regression models were fitted for the basic density, having V 0 and E d as independent variables. For the mechanical properties, the values of R 2 varied from 18 to 63% and higher correlations were found between parallel-to-grain compression strength and E d , and rigidity, static bending and Ed. Ultrasound presented the potential to estimate the properties of tropical wood species from the ASF.

Poisson’s Ratios for Wood Species for Structural Purposes

2015 ◽  
Vol 1088 ◽  
pp. 690-693
Author(s):  
Francisco Antonio Rocco Lahr ◽  
André Luis Christoforo ◽  
Eduardo Chahud ◽  
Luiz A. Melgaço N. Branco ◽  
Rosane A.G. Battistelle ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Confidence Intervals ◽  
Wood Species ◽  
Physical And Mechanical Properties ◽  
Timber Structures ◽  
Structural Elements ◽  
Poisson's Ratios ◽  
Poisson’S Ratios

The broader knowledge about physical and mechanical properties of wood allows reliable timber structures design. Even little addressed in the literature, in several situations Poisson's ratios are required for the evaluation of stresses acting on structural elements. This study aimed to obtain values of Poisson's ratios (ν), plans Longitudinal-Radial (νLR) and Longitudinal-Tangential (νLT), for species Peroba Rosa (Aspidosperma polyneuron) and Jatobá (Hymenaea courbarilL.). For this purpose, forty samples Peroba Rosa and eight samples of Jatobá were prepared for testing in compression parallel to the grain, following the recommendations of ABNT NBR 7190 standard. The results of means confidence intervals, considered at the level of 5% significance, revealed that the Poisson's ratios νLR e νLT to Peroba Rosa are 0.27 and 0.42, respectively, and 0.25 and 0.43 to Jatobá.

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