Title: Characterization of wood strands from young, small-diameter Douglas-fir and western hemlock trees
Author: Yadama, Vikram; Lowell, Eini C.; Langum, Christopher E.
Source: Wood and Fiber Science. 44(1): 36-45
Description: Tensile properties of strands processed from small-diameter Douglas-fir and western hemlock trees grown on the Washington coast were analyzed and effects of location within the tree on properties was examined. Reduction factors for strand properties relative to small, clear solid wood specimen properties were determined by correlating strand properties to previously examined small, clear solid wood specimen properties from the same set of trees. These reductions can be assumed to be damage reduction factors that could help in understanding the expected reduction in tensile or flexure property values from testing solid wood specimens to estimate strand tensile properties. The reduction factors ranged between 0.62 and 0.70 for Douglas-fir and 0.79 and 0.82 for western hemlock for the modulus and were approximately 0.46 for both Douglas-fir and western hemlock for strand tensile strength properties. Measured and calculated strand properties, based on transformation equations, will provide needed values for constructing constitutive relationships when modeling strand-based composites. These properties can also be estimated based on solid wood test specimens if necessary.
Keywords: Douglas-fir, western hemlock, juvenile wood, wood strands, mechanical properties, tensile properties
View and Print this Publication (490.18 KB)
- 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.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Yadama, Vikram; Lowell, Eini C.; Langum, Christopher E. 2012. Characterization of wood strands from young, small-diameter Douglas-fir and western hemlock trees. Wood and Fiber Science. 44(1): 36-45.