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: Evaluation of small-diameter timber for value-added manufacturing : a stress wave approach

Source: Precision forestry : proceedings of the second International Precision Forestry Symposium. Seattle, WA : Institute of Forest Resources, College of Forest Resources, University of Washington, [2003]: pages 91-96.

Author(s)Wang, Xiping; Ross, Robert J.; Punches, John; Barbour, R. James; Forsman, John W.; Erickson, John R.

Publication Year: 2003  View PDF »

Category: Journal Articles

Abstract: The 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.

Keywords: Nondestructive 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

File size: 343 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 24094
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 »