DOI QR코드

DOI QR Code

Indirect Detection of Internal Defects in Wooden Rafter with Ultrasound

  • Lee, Sang-Joon (Division of Wood Engineering, Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Lee, Sangdae (Department of Agricultural Engineering, National Academy of Agricultural Science) ;
  • Pang, Sung-Jun (Department of Forest Sciences, Seoul National University) ;
  • Kim, Chul-Ki (Department of Forest Sciences, Seoul National University) ;
  • Kim, Kwang-Mo (Division of Wood Engineering, Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Kim, Ki-Bok (Center for Safety Measurement, Korea Research Institute of Standards and Science) ;
  • Lee, Jun-Jae (Department of Forest Sciences, Seoul National University)
  • Received : 2013.02.24
  • Accepted : 2013.03.13
  • Published : 2013.03.25

Abstract

The purpose of this research was development of quantitative ultrasonic test methodology for detecting internal defects in members of ancient wooden building. Connection part between wooden members and/or contacted or hidden part by wall of ceiling or other construction materials make it hard to apply direct way of ultrasonic test. So indirect way of ultrasonic test needed to be applied. Test methodology with newly developed prototype of ultrasonic system was proposed. Homogeneous material with polypropylene was also tested for establishing the criterion. Results showed that TOF(time of flight)-energy and pulse length were found out to be proper ultrasonic parameters for predicting depth of defect in wood different from polypropylene. It was not possible to directly apply prediction equation derived from polypropylene. Newly established prediction equation shows coefficient of determination of 0.73 for wood. Finally, defect of replaced rafter members was predicted with the coefficient of determination of 0.32. Various aspects of ultrasound propagation in wood including anisotropy need to be carefully considered to raise up the prediction accuracy.

Keywords

References

  1. Beall, F. C. 2002. Overview of the use of ultrasonic technologies in research on wood properties. Wood Science and Technology 36: 197-212. https://doi.org/10.1007/s00226-002-0138-4
  2. Berndt, H., A. P. Schniewind and G. C. Johnson. 1999. High-resolution ultrasonic imaging of wood.
  3. Bucur, V. and I. Bohnke. 1994. Factors affecting ultrasonic measurements in solid wood. Ultrasonics 32: 385-390. https://doi.org/10.1016/0041-624X(94)90109-0
  4. Han, S. R., C. Y. Park, Y. G. Eom, and J. J. Lee. 2006. Studies about the influence factors on ultrasonic velocity of domestic red pine. Key Engineering Materials 321-323: 1177-1181. https://doi.org/10.4028/www.scientific.net/KEM.321-323.1177
  5. Kabir, M. F., D. L. Schmoldt, and M. E. Schafer. 2002. Time domain ultrasonic signal characterization for defects in thin unsurfaced hardwood lumber. Wood and fiber science 34: 165-182.
  6. Kim, K. M., J. J. Lee, S. J. Lee, and H. Yeo. 2008. Improvement of wood CT images by consideration of the skewing of ultrasound caused by growth ring angle. Wood and Fiber Science 40(4): 572-579.
  7. Lee, J. J. and M. S. Bae. 2004. Determination of ratio of wood deterioration using NDT technique. Journal of the Korean wood science and technology 32(3): 33-41.
  8. Lee, J. J., G. C. Kim, and M. S. Bae. 2003. Patterns of Resistographs for Evaluating Deteriorated Structural Wood Members. Journal of the Korean wood science and technology 31(6): 45-54.
  9. Lee, S. D., S. J. Lee, J. S. Lee, K. B. Kim, J. J. Lee and H. Yea. 2011. Basic study on nondestructive evaluation of artificial deterioration of a wooden rafter by ultrasonic measurement. Journal of Wood Science 57: 387-394. https://doi.org/10.1007/s10086-011-1186-x
  10. Lee, S. J., C. Y. Park, K. M. Kim and J. J. Lee. 2009. Field application of an ultrasonic testing for reconstructing CT images of wooden columns. Journal of the Korean wood science and technology 37(2): 148-154.
  11. Ross, F. J. and R. F. Pellerin. 1994. Nondestructive Evaluation of Wood: 1233.

Cited by

  1. Ultrasonic Nondestructive On-Site Evaluation of Decks in-Service vol.43, pp.4, 2015, https://doi.org/10.5658/WOOD.2015.43.4.486
  2. Feasibility of ultrasonic spectral analysis for detecting insect damage in wooden cultural heritage vol.60, pp.1, 2014, https://doi.org/10.1007/s10086-013-1370-2
  3. Improvement of robustness in ultrasonic attenuation spectroscopy for detecting internal insect damage in wood member of cultural heritage vol.61, pp.2, 2015, https://doi.org/10.1007/s10086-014-1454-7
  4. Nondestructive evaluation of bending strength of wood with artificial holes by employing air-coupled ultrasonics vol.110, 2016, https://doi.org/10.1016/j.conbuildmat.2016.02.020