Strength Loss and Hazard Assessment of Euphrates Poplar Using Stress Wave Tomography

Authors

  • Shanqing Liang
  • Feng Fu

Keywords:

Stress wave tomography, defect, strength loss, hazard assessment

Abstract

Stress wave tomography is a noninvasive testing method for diagnosing defects in standing or cut trees. For this study, the technique was used to diagnose defects on 15 disks of Euphrates poplar (Poulus euphratica Oliv.) cross-sections. Two-dimensional tomograms were generated and used to estimate strength loss and assess potential tree stem failures. Results found that stress wave tomograms can effectively locate decay and void dimensions and that there was a logarithmic significant relationship (r = 0.9679) between real tomographic defect areas and visual defect areas indicated by the tomograms. This regression relationship could improve accuracy of hazard assessment in historic trees when using stress wave tomography. Strength loss was calculated based on Wagener, Coder, and Mattheck's equations. These three equations can provide effective internal tree stem weakness assessment. However, strength loss between tomographic defect areas in cross-sections and real visual defect area had a significant 0.05 statistical difference. The results of this study provided insight into defect diagnosis and hazard assessment for trees in China, especially those with historical significance.

References

Allison RB, Wang XP, Ross RJ (2008) Visual and nondestructive evaluation of red pines supporting a ropes course in the USFS Nesbit lake Camp, Sidnaw, Michigan. Pages 43-48 in Proc 15th International Symposium on Nondestructive Testing of Wood, September 10-12, 2007, Madison, WI. Forest Products Society, Madison, WI.nChinese National Standard (2009a) GB/T 1936.2-2009 Method for determination of the modulus of elasticity in static bending of wood. Standards Press of China, Beijing, China.nChinese National Standard (2009b) GB/T 1936.1-2009 Method of testing in bending strength of wood. Standards Press of China, Beijing, China.nChinese National Standard (2009c) GB/T 1940-2009 Method of testing in toughness of wood. Standards Press of China, Beijing, China.nCoder KD (1989) Should you or shouldn't you fill tree hollows. Grounds Maintenance 24(9):68-70, 98-100.nComino E, Martinis R, Nicolotti G, Sambuelli L, Socco V (2000) Low current tomography for tree stability assessment. In GF Backhaus, H Balder, E Idczak, eds. International Symposium on Plant Health in Urban Horticulture, May 22-25, 2000, Braunschweig, Germany, 278 pp.nDivos F, Szalai L (2002) Tree evaluation by acoustic tomography. Pages 251-256 in Proc 13th International Symposium on Nondestructive Testing of Wood, August 19-21, 2002, Berkeley, CA. Forest Products Society, Madison, WI.nFink GDS, Schwarze FWMR (2008) Detection of incipient decay in tree stems with sonic tomography after wounding and fungal inoculation. Wood Sci Technol 42:117-132.nFu HM, Liu DD (1999) Fuzzy theory and application of nondestructive testing. J Aerospace Power 14(3): 225-230 [in Chinese].nGlibert EA, Smiley ET (2004) Picus sonic tomography for the quantification of decay in white oak (Quercus Alba) and hickory (Carya spp.). Journal of Arboriculture 30(5):277-280.nMattheck C, Breloer H (1994) The body language of trees. A handbook for failure analysis. HMSO, London, UK. 240 pp.nMaurer H, Schubert SI, Baechle F, Clauss S, Gsell D, Dual J, Niemz P (2002) A simple anisotropy correction procedure for acoustic wood tomography. Holzforschung 60 (5):567-573.nSmiley ET, Fraedrich BR (1992) Determining strength loss from decay. Journal of Arboriculture 18(4):201-204.nWagener WW (1963) Judging hazards from native trees in California recreational areas: A guide for professional foresters. Res. Paper PSW-RP-1. Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S Department of Agriculture, Berkeley, CA. 29 pp.nWang XP, Wiedenbeck J, LiangLiang SQ (2009) Acoustic tomography for decay detection in black cherry trees. Wood Fiber Sci 41(2):127-137.nWang XP, Wiedenbeck J, Ross RJ, Forsman JW, Erickson JR, Pilon C, Brashaw BK (2005) Nondestructive evaluation of incipient decay in hardwood logs. Gen Tech Rep FPL-GTR-162. USDA For Serv Forest Prod Lab, Madison, WI. 11 pp.n

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Published

2012-01-13

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Research Contributions