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
 

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

View PDF (1.0 MB byte)

Title: Influence of anatomical, physical, and mechanical properties of diffuse-porous hardwoods on moisture durability of bonded assemblies

Author: Yelle, Daniel J.; Stirgus, Ashley M.;

Date: 2016

Source: FPL-GTR-244. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory.

Publication Series: General Technical Report (GTR)

Description: Studying wood adhesive bond durability is challenging because wood is highly variable and heterogeneous at all length scales. In this study, three North American diffuse-porous hardwoods (hard maple, soft maple, and basswood) and their adhesively bonded as-semblies were exposed to wet and dry cyclic tests. Then, their den-sity differences were related to bond durability. Physical and me-chanical properties (compression-shear) of the solid wood were measured along with mechanical properties of epoxy-bonded as-semblies. Specific gravity tests gave the expected result (hard maple > soft maple > basswood), but volumetric swelling–shrinkage values for basswood were as high as those for hard maple. Tangen-tial swelling–shrinkage values for basswood were approximately equal, suggesting that basswood can withstand swelling stresses with minute deformation. The compression-shear test showed that solid wood lost half its strength after vacuum-pressure soaking but recovered well after redrying. The epoxy-bonded assemblies also lost substantial strength after vacuum-pressure soaking, but soft maple and basswood assemblies completely recovered their strength after redrying. The goal of this study was to further the understanding of how density affects wood adhesive bond durabil-ity under a single wet–dry cycle in which swelling and shrinkage stresses are greatest. This study found that epoxy bond durability begins to deteriorate from the swelling–shrinkage stress in the range of densities between that of hard maple and soft maple. For species that have low density and high volumetric swelling–shrink-age (such as basswood), density is a controlling factor for moisture durability of bonded assemblies.

Keywords: bond durability, diffuse-porous, physical properties, compression-shear, epoxy

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:


Yelle, Daniel J.; Stirgus, Ashley M. 2016. Influence of anatomical, physical, and mechanical properties of diffuse-porous hardwoods on moisture durability of bonded assemblies. FPL-GTR-244. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 8 p.

 


 [ 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.