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 Research Station
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

(135 KB)

Title: Effects of size and moisture on stress wave E-rating of structural lumber

Author: Wang, Xiping

Date: 2008

Source: Proceedings of the 10th world conference on timber engineering : Miyazaki, Japan, 2008 June 2-5. [S.l. : s.n.], 2008: [8] pages.

Publication Series: Miscellaneous Publication

Description:

This paper discusses the effects of size and moisture content on stress wave properties of wood and evaluates the feasibility of using stress waves to E-rate Douglas-fir dimension lumber in green condition. Six size groups of Douglas-fir lumber were tested using both stress wave and static bending methods at different moisture levels, ranging from green to dry conditions. Stress wave speed increased continuously as moisture content decreased through the whole moisture range studied. General speed moisture relationships were developed to adjust stress wave speed values from one moisture condition to any other moisture conditions. It was found that stress wave based dynamic modulus of elasticity (MOE) is generally higher than static bending MOE. However, the difference tends to be constant when moisture content is above fiber saturation point. This suggests that green lumber can be sorted effectively based on dynamic MOE values even if there are moisture differences between individual pieces.

Keywords: Wood grading, grading, flexure, mechanical properties, lumber, nondestructive testing, bending, moisture, stress waves, moisture content, elasticity, modulus of elasticity, wave mechanics, strength, structural timbers, bending strength, Douglas fir

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:


Wang, Xiping 2008. Effects of size and moisture on stress wave E-rating of structural lumber. Proceedings of the 10th world conference on timber engineering : Miyazaki, Japan, 2008 June 2-5. [S.l. : s.n.], 2008: [8] pages.

 


 [ 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.