Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

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
 

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »