Skip to Main Content
Nondestructive evaluation of standing trees with a stress wave method.Author(s): Xiping Wang; Robert J. Ross; Michael McClellan; R. James Barbour; John R. Erickson; John W. Forsman; Gary D. McGinnis
Source: Wood and fiber science. Vol. 33, no. 4 (Oct. 2001).:p. -533 : ill.
Publication Series: Miscellaneous Publication
PDF: Download Publication (281 KB)
DescriptionThe primary objective of this study was to investigate the usefulness of a stress wave technique for evaluating wood strength and stiffness of young-growth western hemlock and Sitka spruce in standing trees. A secondary objective was to determine if the effects of silvicultural practices on wood quality can be identified using this technique. Stress wave measurements were conducted on 168 young growth western hemlock and Sitka spruce trees. After in situ measurements, a 0.61-m-long bole section in the test span was taken from 56 felled trees to obtain small, clear wood specimens. Stress wave and static bending tests were then performed on these specimens to determine strength and stiffness. Results of this study indicate that in situ stress wave measurements could provide relatively accurate and reliable information that would enable nondestructive evaluation of wood properties in standing trees. The mean values of stress wave speed and dynamic modulus of elasticity for trees agreed with those determined from small, clear wood specimens. Statistical regression analyses revealed good correlations between stress wave properties of trees and static bending properties of small, clear wood specimens obtained from the trees. Regression models showed statistical significance at the 0.01 confidence level. Results of this study also demonstrate that the effect of silvicultural practices on wood properties can be identified with the stress wave properties of trees. This indicates that this nondestructive stress wave technique can be used to track property changes in trees and help determine how forests could be managed to meet desired wood and fiber qualities.
- 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.; McClellan, Michael; Barbour, R. James; Erickson, John R.; Forsman, John W.; McGinnis, Gary D. 2001. Nondestructive evaluation of standing trees with a stress wave method. Wood and fiber science. Vol. 33, no. 4 (Oct. 2001).:p. -533 : ill.
KeywordsPicea sitchensis, Tsuga heterophylla, Nondestructive testing, Strength testing, Mechanical properties, Forestry practices, Bending, Regression analysis, Stress wave technique, Stiffness
- Strength and stiffness assessment of standing trees using a nondestructive stress wave technique.
- Nondestructive Testing Technique to Quantify Deterioration from Marine Borer Attack in Sitka Spruce and Western Hemlock Logs: Observations from a Pilot Test
- House log drying rates in southeast Alaska for covered and uncovered softwood logs
XML: View XML