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    Author(s): C.C. Gerhards
    Date: 1980
    Source: Res. Pap. FPL-368. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1980: 8 pages
    Publication Series: Research Paper (RP)
    Station: Forest Products Laboratory
    PDF: View PDF  (318 KB)

    Description

    An evaluation is made of the effect of cross grain on the transit time of longitudinal compression stress waves in Douglas-fir 2 by 8 lumber. Cross grain causes the stress wave to advance with a front or contour skewed in the direction of the grain angle, rather than to advance with a front normal to the long axis of lumber. Thus, the timing of the stress wave in lumber with cross grain is complicated. Based on the static bending modulus of elasticity of the lumber evaluated, an average of transit times for determining a stress wave modulus of elasticity (E) was better than two other timing bases. Another timing basis, however, was best in accounting for stress-wave measurements on 2 by 4’s cut with a 4.4° slope of grain bias from the 2 by 8’s. These results should aid in the development of lumber stress grading systems using E measurements based on stress waves.

    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

    Gerhards, C.C. 1980. Effect of cross grain on stress waves in lumber. Res. Pap. FPL-368. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1980: 8 pages

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    Keywords

    Lumber, cross grain, stress waves, Douglas-fir

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