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http://dx.doi.org/10.5658/WOOD.2008.36.1.061

Determination of Localized Defects in Wood by the Transfer Time of Ultrasonic Waves  

Park, Jun-Chul (Department of Wood Science & Engineering, College of Forest & Environmental Sciences, Kangwon National University)
Hong, Soon-Il (Department of Wood Science & Engineering, College of Forest & Environmental Sciences, Kangwon National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.36, no.1, 2008 , pp. 61-68 More about this Journal
Abstract
The effect of rupture on the speed of ultrasonic wave was investigated with the PUNDIT and the effective detecting method of defects, moving transmitter and receiver. The speed of ultrasonic wave according to the course of rupture was not affected by transmitter and receiver and in the course of parallel rupture, but only in the course of vertical rupture. When rupture was not located on the ultrasonic wave progressing course, rupture was not detected. However, if rupture was formed perpendicularly to the ultrasonic wave progressing course but located on the ultrasonic wave progressing direction, rupture can be detected. Also, the rupture can be detected, when one transmitter and receiver was placed at top and the other at bottom. After detecting rupture in a part, rupture was determined accurately, placing and moving two transmitters and receivers at width.
Keywords
ultrasonic waves; non-destructive evaluation; defects in wood;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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1 손동원, 이동흡. 2004. 비파괴 방법을 이용한 목재의 부후 탐지. 목재공학. 32(4): 74-81.   과학기술학회마을
2 Wang, X., R. J. Ross, J. R. Erickson, J. W. Forsman, E. A. Geske, and M. A. Wehr. 2002. Nondestructive evaluation techniques for assessing modulus of elasticity and stiffness of small-diameter logs. Forest Prod. J. 52(2): 79-85.
3 Wang, X., R. J. Ross, M. McClellan, R. J. Bardour, J. R. Erickson, J. W. Forsman, and G. D. McGinnis. 2001. Nondestructive evaluation of standing trees with a stress wave method. Wood and Fiber Science. 33(4): 522-533.
4 Ross, R. J., K. A. McDonald, D. W. Green, and K. C. Schad. 1997. Relationship between log and lumber modulus of elasticity. Forest Prod. J. 47(2): 89-92.
5 Ross, R. J., L. A. Soltis, and P. Otton. 1998. Role of nondestructive evaluation in the inspection and repair of the USS Constitution. Journal of Preservation Technology. 27(2): 145-152.
6 Ross, R. J. and R. F. Pellerin. 1991. NDE of green material with stress waves: preliminary results using dimension lumber. Forest Prod. J. 41(6): 57-59.
7 Schad, K. C., D. L. Schmoldt, and R. J. Ross. 1996. Nondestructive methods for detecting defects in softwood logs. Res Pap. FPL-RP-546. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. p. 13.
8 김광모, 이상준, 이전제. 2006. 현장 적용이 가능한 X선 CT 시스템 개발 I -X선 촬영법을 이용한 목재의 밀도 측정-. 목재공학. 34(1): 15-22.
9 Wang, X., R. J. Ross, J. R. Erickson, J. W. Forsman, G. D. McGnnis, and R. D. De Groot. 2001. Nondestructive evaluation of potential quality of creosote-treated piles removed from service. Forest Prod. J. 51(2): 63-68.
10 김광모, 이상준, 이전제. 2006. 현장 적용이 가능한 X선 CT 시스템 개발 II -밀도분포를 이용한 목재의 CT영상 구성-. 목재공학. 34(1): 23-31.
11 김광철, 배문성, 이전제. 2003. 노출 환경에 따른 목조고축물 기둥의 열화 차이. 목재공학. 31(2): 58-68.
12 이전제, 김광모, 배문성. 2003. 목재 내 초음파 전달 경로 구명. 목재공학. 31(2): 31-37.   과학기술학회마을
13 Ross, R. J., J. C. Ward, and A. TenWolds. 1992. Identifying bacterially infected oak by stress wave nondestructive evaluation. Res. Pap. FPLRP-512. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. p. 6.