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    Author(s): Xiping Wang
    Date: 2005
    Source: Undervalued hardwoods for engineering materials and components. Madison, WI : Forest Products Society ; Marquette, MI : Northern Initiative, [c2005]: pages 21-29.
    Publication Series: Book Chapter
    PDF: View PDF  (274.53 KB)

    Description

    Nondestructive evaluation (NDE) of wood materials has a long history of application in the wood products industry. Visual grading of lumber is perhaps one of the earliest NDE forms. Visual assessment of a piece of lumber requires the grader to estimate a strength ratio on the basis of observed external defects (USDA 1999). The ratio is used to estimate the strength of lumber relative to a similar piece without defects. The estimation is based on standard lumber grading rules; however, it is entirely subjective and governed by the judgment of the grader. Furthermore, the value assigned to clear lumber of comparable size is only an estimated minimum based on tests of small, clear specimens (Bodig and Jayne 1982).

    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.

    Citation

    Wang, Xiping. 2005. Chapter 3:Sorting red maple logs for structural quality. Undervalued hardwoods for engineering materials and components. Madison, WI : Forest Products Society ; Marquette, MI : Northern Initiative, [c2005]: pages 21-29.

    Keywords

    Stress waves, red maple, grading, nondestructive testing, lumber, elasticity, modulus of elasticity, logs, wood quality

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