Skip to Main Content
Evaluation of small-diameter timber for value-added manufacturing : a stress wave approachAuthor(s): Xiping Wang; Robert J. Ross; John Punches; R. James Barbour; John W. Forsman; John R. Erickson
Source: Precision forestry : proceedings of the second International Precision Forestry Symposium. Seattle, WA : Institute of Forest Resources, College of Forest Resources, University of Washington, : pages 91-96.
Publication Series: Miscellaneous Publication
PDF: Download Publication (343 KB)
DescriptionThe objective of this research was to investigate the use of a stress wave technology to evaluate the structural quality of small-diameter timber before harvest. One hundred and ninety-two Douglas-fir and ponderosa pine trees were sampled from four stands in southwestern Oregon and subjected to stress wave tests in the field. Twelve of the trees, six Douglas-fir and six ponderosa pine, were harvested and sawn into logs and lumber. The mechanical properties of wood were then assessed by both stress wave and static bending techniques in the laboratory. Results of this study indicated a significant difference in stress wave time (SWT) between Douglas-fir and ponderosa pine trees and between two stands of each species. SWT of Douglas-fir trees increased slightly as tree diameter at breast height (DBH) increased; whereas, SWT of ponderosa pine trees decreased significantly as DBH increased. The statistical analysis also revealed good relationships between SWT of trees and modulus of elasticity (MOE) of logs and lumber produced from the trees as the two species were combined. However, the strength of the relationships was reduced within the species because of small sample size and narrow property range.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationWang, Xiping; Ross, Robert J.; Punches, John; Barbour, R. James; Forsman, John W.; Erickson, John R. 2003. Evaluation of small-diameter timber for value-added manufacturing : a stress wave approach. Precision forestry : proceedings of the second International Precision Forestry Symposium. Seattle, WA : Institute of Forest Resources, College of Forest Resources, University of Washington, : pages 91-96.
KeywordsNondestructive testing, small-diameter timber, mechanical properties, Douglas fir, ponderosa pine, value added, stress waves, bending, elasticity, wood quality, smallwood, small timbers, utilization, modulus of elasticity
- Local volume tables for young-growth conifers on a high quality site in the northern Sierra Nevada
- Effects of fire exclusion on forest structure and composition in unlogged ponderosa pine/Douglas-fir forests
- Guide to understory burning in ponderosa pine-larch-fir forests in the Intermountain West
XML: View XML