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    Author(s): Roland Hernandez; David W. Green
    Date: 2007
    Source: Marks' standard handbook for mechanical engineers. New York ; London : McGraw-Hill, c2007: pages 6.121-6.127.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (386.51 KB)

    Description

    Stress-graded structural lumber is produced under two systems: visual grading and machine grading. Visual structural grading is the oldest stress grading system. It is based on the premise that the mechanical properties of lumber differ from those of clear wood because many growth characteristics of lumber affect its properties: these characteristics can be seen and judged by eye (ASTM D 245). The principal growth feature affecting lumber properties are the size and location of knots, sloping grain, and density.

    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

    Hernandez, Roland; Green, David W. 2007. Properties of lumber products. Marks' standard handbook for mechanical engineers. New York ; London : McGraw-Hill, c2007: pages 6.121-6.127.

    Keywords

    Grading, lumber, mechanical properties, wood, wood quality, wood density, shear, wood properties, strength, visual grading, knots, bending strength, tensile strength, compression parallel to grain, mechanical grading, softwoods, shrinkage

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