Comparing the potential of acoustic parameters for the assessment of the strength of timber

Authors

  • Roderick Mackenzie Institute for Sustainable Construction, Edinburgh Napier University, 42 Colinton Road, Edinburgh, EH10 5BT, United Kingdom
  • Charles A. Fairfield Institute for Sustainable Construction, Edinburgh Napier University, 42 Colinton Road, Edinburgh, EH10 5BT, United Kingdom
  • R.Sean Smith Institute for Sustainable Construction, Edinburgh Napier University, 42 Colinton Road, Edinburgh, EH10 5BT, United Kingdom

Keywords:

Elastic waves, Fasteners, Nondestructive examination, Timber, Acoustic parameters, Discrete points, Eighth harmonics, Harmonic frequency, Nodal points, Nodal positions, Solid woods

Abstract

The article compares the potential of acoustic parameters for the assessment of the strength of timber. Acoustic NDT parameters were evaluated during tests on 33 controlled-homogeneity beam specimens cut from 12-layer laminated veneer panels and three solid wood beams. The LF and ultrasonic TOF velocities were also measured. Holes were then drilled through the beams and filled with dowels to simulate knots. These holes were then re-drilled and larger dowels inserted. The number of 25 mm simulated knots was progressively increased along the beam while avoiding drilling at the anti- nodal positions of the eighth harmonic. The eighth harmonic underwent little change until holes were drilled at its anti- nodal points because harmonic frequencies are derived, not from a measurement of the whole specimen, but from discrete points along it.

Published

2011-09-01

How to Cite

1.
Mackenzie R, Fairfield CA, Smith R. Comparing the potential of acoustic parameters for the assessment of the strength of timber. Canadian Acoustics [Internet]. 2011Sep.1 [cited 2021Apr.17];39(3):70-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2415

Issue

Section

Proceedings of the Acoustics Week in Canada