Prediction of Eucalyptus dunnii and Pinus radiata Timber Stiffness Using Acoustics

  • 121 pages

  • Published: 1 Jan 2004

  • Author(s): Joe, Bill, Dickson, Ross, Raymond, Carolyn, ., Jugo L

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Increasing the recovery of high grade material is a primary objective of improving the
profitability of growing trees for sawn products. Stiffness is the major basis of machine
stress grading of sawn timber, and has a major influence on price. It is not a parameter,
however, that is readily measured in logs or standing trees. Derivation of a surrogate
indicator for stiffness would facilitate more effective planning and permit effective log
sorting, while also providing a valuable tool for breeders and silviculturists working with
standing trees.
This study examined the relationship between stiffness and acoustic properties measured
with a variety of stress wave timer tools, for both Eucalyptus dunnii and Pinus radiata.