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Monitoring critical defects of creep rupture in oriented strandboard using acoustic emission: incorporation of EN300 standard

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Abstract

This creep rupture study in commercial oriented strandboard (OSB) used a 4-point flexural test to evaluate the dynamic property changes of a 300×1,000-mm specimen using an acoustic emission (AE) system. Compared to deflection, AE events were more sensitive to damage accumulation than deflection to final failure. Specimens were artificially notched on either the tension- or compression-side and were subjected to 80% stress level at ambient conditions. Defects on the compression side of the bending specimen were found to be more critical than on the tension side in creep-rupture. The in-plane fractures followed patterns of the valleys of low-density spots as defect trenches, demonstrating adverse effects of high variation in horizontal density. An impetus and rationale to incorporate regulatory quality inspection standards and product certification of structural OSB based on the control limits of ±10% panel density as stipulated in EN300 standard is discussed.

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Acknowledgements

Technical support from Tom Breiner and Dr. Liheng Chen is acknowledged. Suggestions by Teresa and Vanessa Vun are appreciated.

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Authors and Affiliations

  1. The Ultran Group, Analytical and Application Division, 1020 Boals Avenue, Boalsburg, PA, 16827, USA

    Ronnie Y. Vun

  2. Louisiana Forest Product Development Center, School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA, 70803, USA

    Cornelis deHoop

  3. College of Natural Resources, University of California at Berkeley, 1301 South 46th St, Richmond, CA, 94804, USA

    Frank C. Beall

Authors
  1. Ronnie Y. Vun
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  2. Cornelis deHoop
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  3. Frank C. Beall
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Corresponding author

Correspondence to Ronnie Y. Vun.

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Experiment conducted at the former University of California Forest Products Laboratory (Nondestructive Evaluation Center), Richmond, CA 94804, USA.

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Vun, R.Y., deHoop, C. & Beall, F.C. Monitoring critical defects of creep rupture in oriented strandboard using acoustic emission: incorporation of EN300 standard. Wood Sci Technol 39, 199–214 (2005). https://doi.org/10.1007/s00226-004-0278-9

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