Browse > Article

A Study on Elastic Guided Wave Modal Characteristics in Multi-Layered Structures  

Cho, Youn-Ho (Wave and Structural Heath Monitoring Lab., School of Mechanical Engineering, Pusan National University)
Lee, Chong-Myoung (Engineering Science and Mechanics Department, Pennsylvania State University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.28, no.2, 2008 , pp. 211-216 More about this Journal
Abstract
In this study, we have developed a program which can calculate phase and group velocities, attenuation and wave structures of each mode in multi-layered plates. The wave structures of each mode are obtained, varying material properties and number of layers. The key in the success of guided wave NDE is how to optimize the mode selection scheme by minimizing energy loss when a structure is in contact with liquid. In this study, the normalized out-of-plane displacements at the surface of a free plate are used to predict the variation of modal attenuation and verily the correlation between attenuation and wave structure. It turns out that the guided wave attenuation can be efficiently obtain from the out-of-plane displacement variation of a free wave guide alleviating such mathematical difficulties in extracting complex roots for the eigenvalue problem of a liquid loaded wave guide. Through this study, the concert to optimize guided wave mode selection is accomplished to enhance sensitivity and efficiency in nondestructive evaluation for multi-layered structures.
Keywords
Guided Wave; Phase Velocity; Group Velocity; Attenuation; Wave Structure;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Michael R. Gorman, 'Plate wave acoustic emission,' J. Acoust. Soc. Am., Vol. 90, No. 1, pp. 385-364, (1991)   DOI
2 이종명, 이강용, 조윤호, "다층구조물내 탄성 유도 초음파의 전파에 관한 연구", 한국비파괴 검사학회 춘계학술대회 pp. 99-109, (1999)
3 S. I. Rokhin, T. K. Bolland and Laszio Adler, 'Reflection and refraction of elastic waves on a plane interface between two generally anisotropic media,' J. Acoust. Soc. Am., Vol. 79, No. 4, pp. 906-919, (1986)   DOI
4 W. Zhuang, A. H. Shah and S. K. Datta, 'Axisymmetric guided wave scattering by cracks in welded steel pipes,' Journal of Pressure Vessel Technology, Vol. 119, pp. 401-406, (1997)   DOI   ScienceOn
5 J. L. Rose and J. Ditri 'Pulse-Echo and though transmission lamb wave techniques for adhesive bond inspectin,' British Jr. NDT, Vol. 34, No. 12, (1994)
6 J. L. Rose, K. Rajana and A. Plarski, 'Ultrasonic guided waves for NDE of adhesive bonded joints in aging aircraft,' Proceedings of Adhesive Society Meeting, Orlando, FL, Feb 20-24, (1994)
7 Ajit K. Mal, Pei-cheng Xu and Yosoph Bar-Cohen, 'Leaky Lamb waves for the ultrasonic nondestructive evaluation of adhesive bonds,' Journal of Engineering Materials and Technology, Vol. 112, pp. 255-259, (1990)   DOI
8 Akihiro Sawaguchi and Kohji Toda, 'Lamb wave propagation characteristics on water-loaded LiNbO3 thin plates', Jpn. J. Appl. Phys., Vol. 32, Part 1, No. 5B, pp. 2388-2391, (1993)   DOI
9 Rose, J. L., Cho, and Ditri, J., J., 'Cylindrical guided wave leakage due to liquid loading,' Review of Progress in Quantitative Nondestructive Evaluation', Vol. 13, Plenum Press, (1994)
10 Peter B. Nagy, 'Longitudinal guided wave propagation in a transversely isotropic rod immersed in fluid,' J. Acoust. Soc. Am., Vol. 98, No. 1, pp. 454-457, (1995)   DOI   ScienceOn