Leaky Lamb Waves (LLW) in Multiorientation Composite Laminates
Considerable efforts have been made in recent years to develop quantitative nondestructive evaluation (NDE) techniques for composite materials, which are being used increasingly in primary structures. The leaky Lamb wave phenomenon has shown considerable potential as an NDE method . Most results reported in this area to date have been concerned with unidirectional laminates [2–4]. This is attributed to the complexity involved in theoretically predicting the response of these materials, as well as to certain difficulties associated with the experimental research. In practice, structural composites are made up of layers in various orientations. Their stacking order is dependent upon the requirements of the particular application. Therefore, the capability of analyzing the behavior of Lamb waves in multiorientation laminates is crucial for the application of LLW to composites.
KeywordsDispersion Curve Composite Laminate Lamb Wave Simplex Algorithm Data Inversion
Unable to display preview. Download preview PDF.
- 1.Y. Bar-Cohen, Ultrasonic NDE of Composites — A Review, Solid Mechanics Research for Quantitative NDE, J. D. Achenbach, and Y. Rajapakse (Eds.), Martinus Nijhoff Publishers, Boston, (1987) pp 187–201.Google Scholar
- 2.A. K. Mal and Y. Bar-Cohen, Stress Waves in Layered Composite Laminates, Proc. 4th Japan-United States Conference on Composite Materials, Washington, DC, June 27–29, 1988.Google Scholar
- 3.A. H. Nayfeh, T. W. Taylor, and D. E. Chimenti, Theoretical Wave Propagation in Multilayered Orthotropic Media, Proc. of ASME Symp. on Wave Propagation in Structural Composites, A. K. Mal and T. C. T. Ting (Eds.), ASME-AMD, Vol. 90 (1988), pp 17–27.Google Scholar
- 5.M. R. Karim, A.K. Mal, and Y. Bar-Cohen, Inversion of Leaky Lamb Wave Data by Simplex Algorithm, submitted for publication in the J. Acoust. Soc. Am.Google Scholar
- 6.A. K. Mal, M. R. Karim, and Y. Bar-Cohen, Determination of the Properties of Composite Interfaces by an Ultrasonic Method, submitted by J. Materials Science and Eng.Google Scholar