Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern
Help
 

GeoTreesearch


Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

(505 KB)

Title: Experimental investigation of stress wave propagation in standing trees

Author: Zhang, Houjiang; Wang, Xiping; Su, Juan

Date: 2011

Source: Holzforschung. Vol. 65, no. 5 (Aug. 2011): p. 743-748.

Publication Series: Journal/Magazine Article (JRNL)

Description: The objective of this study was to investigate how a stress wave travels in a standing tree as it is introduced into the tree trunk through a mechanical impact. A series of stress wave time-of-flight (TOF) data were obtained from three freshly-cut red pine (Pinus resinosa Ait.) logs by means of a two-probe stress wave timer. Two-dimensional (2D) and three-dimensional (3D) stress wave contour maps were constructed based on the experimental data using a commercial software. These stress wave contour maps represent the wave fronts in a time sequence, illustrating the flow of stress wave energy within a log. The analysis of TOF data and wave fronts indicates that stress wave propagation in standing trees is affected by tree diameter, travel distance, and internal wood conditions (wood properties and structural defects). When a stress wave is introduced into a tree trunk from a point source, it initially propagates in the impact direction as a 3D wave. Then the flow of the stress wave energy gradually changes towards the longitudinal directions. As the diameter-to-distance ration reaches 0.1 or below, the wave begins to travel as a quasi 1D wave.

Keywords: Wood deterioration, red pine, pine, grading, mechanical properties, wood grading, acoustic properties, wood quality, wood defects, stress waves, nondestructive testing, acoustic imaging, Pinus resinosa, wood testing, testing methods, pine decay, standing trees, acoustic testing, wood decay, log quality, log grading, 2D stress wave contour maps, 3D stress wave contour maps, knots, logs, stress wave contour map, stress wave propagation, time-of-flight, wave front

Publication Notes:

  • 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.

XML: View XML

Citation:


Zhang, Houjiang; Wang, Xiping; Su, Juan; 2011. Experimental investigation of stress wave propagation in standing trees. Holzforschung. Vol. 65, no. 5 (Aug. 2011): p. 743-748.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.