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    Author(s): David E. Kretschmann; Troy W. Schmidt; Roderic S. Lakes; Steven M. Cramer
    Date: 2002
    Source: Proceedings of the 2002 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, June 10-12, 2002, Milwaukee, Wisconsin [electronic resource]. Bethel, CT : Society for Experimental Mechanics. c2002: [3] pages.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (441 KB)

    Description

    The annual rings of softwoods are visually obvious and represent cylindrical layers of primarily cellulosic material that possess significantly different properties. For simplicity, wood construction products are designed assuming a material homogeneity that does not exist. As rapidly grown plantation trees are used for wood products, fewer rings are contained in an individual wood product with the outcome of each individual ring playing a greater role in product structural performance. The magnitudes of these earlywood and latewood property differences are largely unknown because of the difficulty in measuring small specimens. A cooperative study between the University of Wisconsin-Madison and USDA FS Forest Products Laboratory is underway to quantify the impact of variations in earlywood and latewood proportions. This paper discusses the background, approach, device used to determine modulus of elasticity (E) and shear modulus (G) for earlywood and latewood, difficulties faced with testing wood, and presents preliminary results.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Kretschmann, David E.; Schmidt, Troy W.; Lakes, Roderic S.; Cramer, Steven M. 2002. Micromechanical measurement of wood substructure properties. Proceedings of the 2002 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, June 10-12, 2002, Milwaukee, Wisconsin [electronic resource]. Bethel, CT : Society for Experimental Mechanics. c2002: [3] pages.

    Keywords

    Wood substructure, wood anatomy, earlywood, latewood, mechanical properties of wood. loblolly pine.

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