Experimental Investigation of Vibrating Laminated Composite Plates by Optical Interferometry Method

Most of the work done for the vibration of composite plates published in the literature are analytical and numerical studies with few experimental results available. In this study, an experimental amplitude-fluctuation electronic speckle pattern interferometry method for out-of-plane displacement measurement is employed to investigate the vibration behavior of square and rectangular composite plates with different stacking sequences. Both resonant frequencies and corresponding mode shapes can be obtained experimentally using the present method. High-quality interferometric fringes for mode shapes are produced instantly by a video recording system. Four different types of geometric configurations and stacking sequences of 16-layer laminated composite plates are investigated in this study, namely, a [0] 16 square plate, a [0] 16 rectangular plate, a [0/45/90/-45] 2s square plate, and a [0/45/90/-45] 2s rectangular plate. The numerical calculations by the finite element method and Rayleigh-Ritz technique are performed, and the results are compared with the experimental measurements. Good agreement is obtained for both results of resonant frequencies and mode shapes.

[1]  Chien-Ching Ma,et al.  Vibration Characteristics for Piezoelectric Cylinders Using Amplitude-Fluctuation Electronic Speckle Pattern Interferometry , 1998 .

[2]  Catherine Wykes,et al.  Holographic and speckle interferometry: Electronic Speckle Pattern Correlation Interferometry , 1989 .

[3]  Arthur W. Leissa,et al.  The free vibration of rectangular plates , 1973 .

[4]  C C Ma,et al.  The investigation of three-dimensional vibration for piezoelectric rectangular parallelepipeds using the AF-ESPI method. , 2001, IEEE transactions on ultrasonics, ferroelectrics, and frequency control.

[5]  J. N. Butters,et al.  Speckle pattern and holographic techniques in engineering metrology , 1971 .

[6]  O J Lokberg,et al.  Use of modulated reference wave in electronic speckle pattern interferometry , 1976 .

[7]  Sridhar Krishnaswamy,et al.  Synchronized reference updating technique for electronic speckle interferometry , 1993 .

[8]  Wei-Chung Wang,et al.  Vibration measurement by the time-averaged electronic speckle pattern interferometry methods. , 1996, Applied optics.

[9]  Jaroslav Mackerle,et al.  Finite element linear and nonlinear, static and dynamic analysis of structural elements, an addendum , 2002 .

[10]  C. Vest.  Holographic Interferometry , 1979 .

[11]  Katherine Creath,et al.  Vibration-observation techniques for digital speckle-pattern interferometry , 1985 .

[13]  Chien-Ching Ma,et al.  Experimental Measurement of Mode Shapes and Frequencies for Vibration of Plates by Optical Interferometry Method , 2001 .

[14]  Chien-Ching Ma,et al.  Inverse Evaluation of Material Constants for Composite Plates by Optical Interferometry Method , 1999 .