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Determining acoustic and mechanical properties of Australian native hardwood species for guitar fretboard production

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Abstract

Australian hardwood species have potential in musical instrumentation replacing hardwood species such as Dalbergia latifolia (Indian rosewood- IRW) which is the main species used in guitar fretboard production. In this study, a detailed characterisation was conducted using dynamic and static testing to determine samples’ mechanical strength. Dynamic testing was conducted using non-destructive acoustic testing to record the sound velocity travelling through boards in the longitudinal grain direction. The elastic modulus for the tested samples was also calculated using the dynamic results. Four point bending tests were conducted in accordance with AS/NZS 4063.1 to determine the bending strength (MOR) and stiffness (MOE) to be compared with the dynamic results. The Janka hardness for each of the species was determined for reference in accordance with the Australian testing method developed by J.J. Mack. Species tested had sound radiation characteristics values close to Indian rosewood (IRW) samples tested. The internal friction of Australian samples tested and IRW were low providing indication for future applications of these species to musical instrument manufacture. Sound quality factor and speed of sound determined for tested species were similar to IRW. Mechanical strength and performance of the tested species displayed similar values to the IRW properties; indicating the potential of these species for long-term use in fretboard applications. The MOE and MOR values for Australian hardwood species were dependent on the density; the Queensland walnut (QWL), Kuranda Satin ash (KSA), Hickory ash (HKA) and Red mahogany (RMG) samples had highest mechanical strength values within the range of IRW including the Janka hardness, MOR and MOE values. The work presented here identified four Australian hardwood species with potential for fretboard production. These species will be tested for sound quality and performance prior to fretboard prototyping.

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Acknowledgements

The authors of this paper would like to acknowledge the great contribution of Mr Merv Waters from BRANCH95 for providing the species for testing and Mr Patrick Evans from Maton’s Guitar for his great contribution in evaluating the boards using industry’s benchmark for sound quality parameters and Mr Peter Bernoth from The Plutonium Studio for providing access to the anechoic room for testing. The project was a part of Australian component of ACIAR project titled: “Enhancing key elements of the value chains for plantation-grown wood in Lao PDR”.

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Authors and Affiliations

  1. Forest Product Innovation, Department of Agriculture and Fisheries, Queensland Government, Brisbane, Australia

    Maryam Shirmohammadi & Adam Faircloth

  2. Burapha Agro-Forestry Co. Ltd., Vientiane, Lao PDR

    Adam Redman

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  1. Maryam Shirmohammadi
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  2. Adam Faircloth
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  3. Adam Redman
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Correspondence to Maryam Shirmohammadi.

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Shirmohammadi, M., Faircloth, A. & Redman, A. Determining acoustic and mechanical properties of Australian native hardwood species for guitar fretboard production. Eur. J. Wood Prod. 78, 1161–1171 (2020). https://doi.org/10.1007/s00107-020-01599-6

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  • DOI: https://doi.org/10.1007/s00107-020-01599-6

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