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    Author(s): Barbara L. IllmanVina W. YangRobert J. RossWilliam J. Nelson
    Date: 2002
    Source: Thirty-third Annual Meeting of the International Research Group on Wood Preservation, 2002 May 12-17, Cardiff, South Wales, UK. Stockholm, Sweden : IRG Secretariat, 2002. IRG/WP ; 02-20243: [6] pages.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (471 KB)

    Description

    Stress wave nondestructive evaluation (NDE) technologies are being used in our laboratory to evaluate the performance properties of engineered wood. These techniques have proven useful in the inspection of timber structures to locate internal voids and decayed or deteriorated areas in large timbers. But no information exists concerning NDE and important properties of wood composites exposed to decay fungi. For our pilot study on several types of wood composites, we examined the relationship between nondestructive stress wave transmission, decay rate and the bending properties of OSB exposed to the brown-rot fungus, Gloeophyllum trabeum (MAD-617). The following measurements were taken: stress wave transmission time (pulse echo test method), static bending test (ASTM D3043-95), and decay (expressed as percent weight). Stress wave measurements correlated with strength loss and with increasing rate of fungal decay. Stress wave NDE has great potential as a method for inspection of wood composite load-bearing (in-service) structures, detection of decay in laboratory tests, assessment of chemical additives to improve wood composite durability, and prediction of long term composite performance.

    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

    Illman, Barbara L.; Yang, Vina W.; Ross, Robert J.; Nelson, William J. 2002. Nondestructive evaluation of oriented strand board exposed to decay fungi. Thirty-third Annual Meeting of the International Research Group on Wood Preservation, 2002 May 12-17, Cardiff, South Wales, UK. Stockholm, Sweden : IRG Secretariat, 2002. IRG/WP ; 02-20243: [6] pages.

    Keywords

    Decay fungi, OSB, NDE, stress wave evaluation.

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https://www.fs.usda.gov/treesearch/pubs/6394