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Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Stress Wave Propagation on Standing Trees-Part 1. Time-of-Flight Measurement and 2D Stress Wave Contour Maps

Source: In: Proceedings of the 16th nondestructive evaluation of wood symposium. 2009 October 12-14. Beijing, china: Beijing Forestry University, Beijing, China. Dr. Houjian Zhang and Dr. Xiping Wang, Des. p. 53--58. 2009

Author(s)Zhang, Houijiang; Wang, Xiping; Ross, Robert

Publication Year: 2009  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4714-1A

Abstract: The objective of this paper is to investigate how a stress wave travel in a standing tree as it is introduced into the tree trunk through a mechanical impact. A series of stress wave time-of-flight data were obtained on three freshly cut red pine logs using a two-probe stress wave timer (Fakopp Microsecond Timer). Two dimensional (2D) stress wave contour maps in both cross-section plane and longitudinal-radial plane of the logs were constructed using a 3DFieldPro software. These 2D stress wave contour maps represent the wave fronts in a time sequence, which show stress waves propagating through a tree stem in radial and longitudinal directions. The experimental results indicate that stress wave propagation on standing trees are affected by tree diameter and localized defects such as knots.

Keywords: Wood deterioration; testing; red pine; pine grading; grading; mechanical properties; wood grading; pine; acoustic properties; wood quality; acoustic properties; wood defects; stress waves; nondestructive testing; acoustic imaging; Pinus resinosa; trees; pine decay; standing trees; acoustic testing; wood decay; log quality; log grading; 2D stress wave contour maps

Publication Review Process: Non-Refereed (Other)

File size: 382 kb(s)

Date posted: 05/02/2011
RITS Product ID: 36095
Current FPL Scientists associated with this product (listed alphabetically)
Ross, Robert J.
Supervisory Research Gen. Engineer
Wang, Xiping
Research Forest Products Technologist

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