Non-Destructive Determination of the Elastic and Acoustic Properties of Resonant Wood Used in the Manufacture of Violins

The aim of the paper was to determine the acoustic characteristics (speed of sound propagation in wood) and elastic (modulus of elasticity) on the three directions of wood, using non-destructive methods. The samples studied were cubic in shape from spruce and maple wood species, resonant and common. To determine the Young’s modulus and shear modules as well as the Poisson’s ratios, the expression of the propagation of Lamb waves generated and received using US translators with Hertzian contact with fr = 100kHz was used. The experimental data obtained show that mainly the velocities in radial and tangential direction are about one third of the longitudinal velocity, with the radial velocity higher than the tangential one. The radial velocity can be up to almost 14% higher than the tangential velocity. The applicability of this study consists in establishing the acoustic quality of the resonant wood from the Romanian area, used in the manufacture of our violins from the country.

[1]  M. Rousek,et al.  Annals of Warsaw University of Life Sciences-SGGW , 2021 .

[2]  V. Bucur,et al.  Effect of wood species on vibration modes of violins plates , 2020, European Journal of Wood and Wood Products.

[3]  A. Savin,et al.  Physical and Mechanical Properties of Ammonia-Treated Black Locust Wood , 2020, Polymers.

[4]  M. Stanciu,et al.  Bark Features for Identifying Resonance Spruce Standing Timber , 2019, Forests.

[5]  Hailin Feng,et al.  Review of the use of air-coupled ultrasonic technologies for nondestructive testing of wood and wood products , 2017, Comput. Electron. Agric..

[6]  M. Guaita,et al.  Determination of the mechanical properties of Castanea sativa Mill. using ultrasonic wave propagation and comparison with static compression and bending methods , 2015, Wood Science and Technology.

[7]  T. Nowak,et al.  Non-destructive testing of wood – correlation of ultrasonic and stress wave test results in glued laminated timber members , 2015 .

[8]  Peter Niemz,et al.  Determining moisture-dependent elastic characteristics of beech wood by means of ultrasonic waves , 2012, Wood Science and Technology.

[9]  John C. F. Walker,et al.  Effects of moisture content and temperature on acoustic velocity and dynamic MOE of radiata pine sapwood boards , 2011, Wood Science and Technology.

[10]  A. Savin,et al.  Determination of Elastic Properties of CFRP Using Lamb Waves Resonant Spectroscopy , 2010 .

[11]  Francisco García Fernández,et al.  MOE prediction in Abies pinsapo Boiss. timber: Application of an artificial neural network using non-destructive testing , 2009 .

[12]  Yang Wang,et al.  A comparative study on the velocities of stress wave propagation in standing Fraxinus mandshurica trees in frozen and non-frozen states , 2009 .

[13]  Sébastien Grondel,et al.  Transient modeling of Lamb waves generated in viscoelastic materials by surface bonded piezoelectric transducers , 2004 .

[14]  V. Bucur,et al.  Elastic constants for wood by an ultrasonic method , 1984, Wood Science and Technology.

[15]  V. Bucur,et al.  Acoustics of Wood , 1996 .

[16]  M. Krause,et al.  Testing Of Wooden Construction Elements with Ultrasonic Echo Technique and X-Ray , 2022 .