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 (5.9 MB)

Title: Evaluation of materials during outdoor testing using a computer-controlled test apparatus

Author: Williams, R. Sam; Lacher, Steven; Halpin, Corey; White, Christopher;

Date: 2006

Source: Proceedings of the Fifth International Woodcoatings Congress : Enhancing Service Life, 2006 October 17-18, Prague, Czech Republic. Middlesex, UK : PRA Coatings Technology Centre, c2006: 25 p.: ISBN: 9780955131745: 095513174X

Publication Series: Miscellaneous Publication

Description: Ultraviolet radiation, moisture, heat, and cyclic fatigue are some of the stressors that cause materials to degrade outdoors. Considerable research has addressed the effects of ultraviolet radiation and moisture on the rate of this degradation. An often overlooked stressor on materials, during outdoor testing, is the cyclic fatigue. Cyclic fatigue is caused by self-induced dimensional change of a material or by dimensional change of materials in contact with it. For example, changes in the moisture content of wood cause it to shrink and swell, which leads to surface checking; dimensional change of wood may cause paint to crack or sealants to debond. In our research on the service life prediction of sealants, we have developed a computer-controlled test apparatus and accessory instrumentation to subject materials to cyclic loads and to measure their degradation as they are tested. The changes in elastic modulus, temperature dependence of the modulus, plasticizing effect of water above and below freezing, and evaluation of specimen quality at the beginning of the test were made possible using this equipment.

Keywords: Elasticity, modulus of elasticity, temperature, testing-machines, accelerated life testing, service life, sealing compounds, weathering, fatigue testing machines, moisture, fatigue, swelling, shrinkage, accelerated testing, building materials

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:


Williams, R. Sam; Lacher, Steve; Halpin, Corey; White, Christopher; 2006. Evaluation of materials during outdoor testing using a computer-controlled test apparatus. Proceedings of the Fifth International Woodcoatings Congress : Enhancing Service Life, 2006 October 17-18, Prague, Czech Republic. Middlesex, UK : PRA Coatings Technology Centre, c2006: 25 p.: ISBN: 9780955131745: 095513174X

 


 [ 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.