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TECHNICAL PAPERS

Characterization of Delamination in Beams Using Flexural Wave Scattering Analysis

[+] Author and Article Information
S. I. Ishak, G. R. Liu, S. P. Lim, H. M. Shang

Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

J. Vib. Acoust 123(4), 421-427 (Apr 01, 2001) (7 pages) doi:10.1115/1.1387023 History: Received April 01, 2000; Revised April 01, 2001
Copyright © 2001 by ASME
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References

Cawley,  P., 1984, “The Impedance Method of Non-destructive Inspection,” NDT Int., 17(2), pp. 59–65.
Cawley,  P., 1987, “The Sensitivity of the Mechanical Impedance Method of Non-destructive Testing,” NDT Int., 20(4), pp. 209–215.
Cawley,  P., Woolfrey,  A. M., and Adams,  R. D., 1985, “Natural Frequency Measurements for Production Quality Control of Fibre Composites,” Composites, 16(1), pp. 23–27.
Adams,  R. D., and Cawley,  P., 1988, “A Review of Defect Types and Non-destructive Testing Techniques for Composites and Bonded Joints,” NDT Int., 21, pp. 208–222.
Wang,  J. T. S., Liu,  Y. Y., and Gibby,  J. A., 1982, “Vibrations of Split Beams,” J. Sound Vib., 84(4), pp. 491–502.
Mujumdar,  P. M., and Suryanarayan,  S., 1988, “Flexural Vibrations of Beams with Delaminations,” J. Sound Vib., 125(3), pp. 441–461.
Tracy,  J. J., and Pardoen,  G. C., 1989, “Effect of Delamination on the Natural Frequencies of Composite Laminates,” J. Compos. Mater., 23, pp. 1201–1215.
Shen,  M. H. H., and Grady,  J. E., 1992, “Free Vibrations of Delaminated Beams,” AIAA J., 30(5), pp. 1361–1370.
Tenek,  L. H., Henneke,  I. I. E. G., and Gunzburger,  M. D., 1993, “Vibration of Delaminated Composite Plates and Some Applications to Non-destructive Testing,” Composite Structures, 23, pp. 253–262.
Ju,  F., Lee,  H. P., and Lee,  K. H., 1994, “Free Vibration Analysis of Composite Beams with Multiple Delaminations,” Composites Eng., 4(7), pp. 715–730.
Liu,  G. R., and Lam,  K. Y., 1994b, “Characterization of a Horizontal Crack in Anisotropic Laminated Plates,” International Journal of Solids and Structures , 31(21), pp. 2965–2977.
Liu,  G. R., and Achenbach,  J. D., 1995, “Strip Element Method to Analyze Wave Scattering by Cracks in Anisotropic Laminated Plates,” ASME J. Appl. Mech., 62, pp. 607–613.
Liu,  G. R., and Achenbach,  J. D., 1994, “A Strip Element Method for Stress Analysis of Anisotropic Linearly Elastic Solids,” ASME J. Appl. Mech., 61, pp. 270–277.
Liu,  G. R., Lam,  K. Y., and Shang,  H. M., 1996, “Scattering of Waves by Flaws in Anisotropic Laminated Plates,” Composites, Part B 27B, pp. 431–437.

Figures

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Geometry and modelling of a beam with a delamination
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Contour for the infinite beam subjected to a harmonic concentrated load for x>−ξ
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Homogeneous and particular solution of the displacement of a beam
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Calculated displacement of Beam A excited at frequency of 17.5 kHz
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Calculated displacement of beam A and B excited at frequency of 12.5 kHz
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Calculated displacement of beam B and C excited at frequency of 7.5 kHz
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Schematic drawing of experiment set-up
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Calculated and measured displacement of beam B at various frequencies
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Calculated and measured displacement of perspex beam

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