Experimental Study of Plates by ESPI

S. Rusnáková, P. Koštial, D. Bakošová, J. Kucerova, M. Mokryšová

Abstract

Fibre-reinforced components of various shapes and different boundary conditions (free, clamped, and hinged) commonly occur in practice. Designers need to be able to predict the stiffness parameters and damping values of such components for conditions such as aeroelasticity, acoustic fatigue, and so on. Electronic speckle pattern interferometry (ESPI) can be useful tool for easily determination of Poisson’s ratio, Young's modulus E and shear modulus G from the measured resonant frequencies. In this study we investigate the vibration behaviour of square composite plates with different stacking sequences by ESPI and influence of various thicknesses to resonant frequencies of corresponding mode shapes. Both resonant frequencies and corresponding mode shapes can be compared by numerical calculations by the finite element method. Good agreement is obtained for both results of resonant frequencies and mode shapes. The mode shapes of laminate composite plates are influenced by material properties, boundary conditions, geometry, and the lamination arrangement.

Keywords

ESPI, vibration, laminate plate, FEM

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IMEKO-TC22-2007-053u.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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