Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Leslie H. Groom; Laurence Mott; Stephen Shaler
    Date: 2002
    Source: Wood and Fiber Science 34(1):14-27
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (3.3 MB)

    Description

    This paper is the first in a three-part series investigating the mechanical properties of loblolly pine fibers. This paper outlines the experimental method and subsequent variation of latewood fiber mechanical properties in relation to tree position. Subsequent papers will deal with differences between earlywood and latewood fibers and effect of juvenility and tree height on global fiber properties. In this paper, the mechanical properties were detennined on individual wood fiber with a user-built tensile testing apparatus. Cross-Sectional areas of post-tested fibers were detennined with a confocal scanning laser microscope and used to convert acquired load-elongation curves into stress-strain curves. The modulus of elasticity and ultimate tensile stress of loblolly pine latewood fibers tested in this study ranged from 6.55 to 27.5 GPa and 410 to 1,422 MPa. respectively. Fibers from the juvenile core of the main stem were on the low end of the mechanical property scale, whereas fibers beyond the twentieth growth ring were near the high end of the scale. Coefficient of variation for fiber stiffness and strength averaged around 20 to 25%. The shape of the fiber stress-strain curves is dependent on their growth ring origins: Mature fibers were linear from initial loading until failure, whereas juvenile fibers demonsttated curvilinearity until about 60% of maximum load followed by linear behavior to failure.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • 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.

    Citation

    Groom, Leslie H.; Mott, Laurence; Shaler, Stephen 2002. Mechanical properties of individual southern pine fibers. Part I. Determination of variability of stress-strain curves with respect to tree height and juvenility. Wood and Fiber Science 34(1):14-27

    Keywords

    Modulus of elasticity, ultimate tensile stress, juvenility, confocal scanning laser microscope, cross-sectional area, microfibril angle

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page