Inverse evaluation of material constants for composite plates by optical interferometry method
Journal
AIAA journal
Journal Volume
37
Journal Issue
8
Pages
947-953
Date Issued
1999
Author(s)
Abstract
Electronic speckle pattern interferometry (ESPI) is a powerful tool for the full field, noncontact, and real-time measurement method of surface displacements for deformed bodies. As compared with the conventional film recording and optical reconstruction procedures used for holographic interferometry, the interferometric fringes of ESPI are produced instantly by a video recording system. In this study, the amplitude fluctuation ESPI (AF-ESPI) optical system is used for measuring the resonant frequencies and mode shapes of vibrating composite plates. By making use of the resonant frequencies for free plates obtained experimentally, an inverse evaluation for the material constants is developed using the Rayleigh-Ritz technique and the Simplex method for function minimization. Finally, finite element calculation is used to construct the mode shapes from the obtained material constants by inverse evaluation, and the results are compared with the experimental observations. The experimental method based on optical AF-ESPI setup and the inverse algorithms proposed might become a reliable and self-consistent methodology for evaluating material constants of composite plates.
Type
journal article