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    Author(s): B.Z. Yang; R.D. Seale; R. Shmulsky; J. Dahlen; X. Wang
    Date: 2017
    Source: Wood and Fiber Science. 49(2): 134-145
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (872.0 KB)

    Description

    The identification of strength-reducing characteristics that impact modulus of rupture (MOR) is a key differentiation between lumber grades. Because global design values for MOR are at the fifth percentile level and in-grade lumber can be highly variable, it is important that nondestructive evaluation technology be used to better discern the potential wood strength. In that manner, higher-performance pieces could potentially be identified and their value captured accordingly. In this study, laboratory tests of three nondestructive testing (NDT) technologies and destructive four-point static bending were applied to 343 pieces of visually graded No. 2 southern pine lumber in the 38 X 140 mm2 (n=86), 38 X 186 mm2 (n=112), 38 X 236 mm2 (n=91), and 38 X 287 mm2 (n=54) sizes collected across the southeast region of the United States. The NDT tests included continuous lumber test in continuous proof bending (MetriguardModel 7200 High Capacity Lumber Tester), transverse vibration (Metriguard E-Computer), and two longitudinal stress wave tools (Falcon A-Grader and Fiber-gen Director HM200). Following nondestructive tests, the specimens were destructively tested in four-point static bending. Single-predictor linear correlations were observed between static bending MOE and MOR value; and NDT outputs and bending MOR value. The regression results showed that the average NDT outputs (r2 = 0.23-0.28) had lower performance than static bending MOE (r2 = 0.39), for predicting the bending MOR of sawn lumber.

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    Citation

    Yang, B.Z.; Seale, R.D.; Shmulsky, R.; Dahlen, J.; Wang, X. 2017. Comparison of nondestructive testing methods for evaluating No. 2 Southern pine lumber: Part B, modulus of rupture. Wood and Fiber Science. 49(2): 134-145.

    Keywords

    Nondestructive evaluation, transverse vibration evaluation, longitudinal stress wave evaluation, high capacity lumber tester, modulus of rupture, lumber grades

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https://www.fs.usda.gov/treesearch/pubs/54401