In order to improve the predictions of dynamic behavior in laminated composite structures, several lower vibration modes from experimental results are used to update the mechanical properties followed by the updated frequencies. As an updating process of the natural frequencies, the optimization algorithm based on conjugate gradient method is adopted. The mechanical properties of lamina, E₁, E₂, (nu) ₁₂ and G₁₂, are design parameters for the identification process. The proposed method is applied to predict the dynamic behavior of laminated composite plates of [0]_8T and [+/- 45]_2S separately and interchangeably. Also, the mixed case for [0]_8T and [+/- 45]_2S is examined to check the possibility for the improved prediction generally. The good agreement is obtained between the measured frequencies and the numerical ones. Based on the results for all the cases studied, the proposed approach has a clear potential in characterizing the mechanical properties of composite lamina.

Date Published: 24 July 1998
PDF: 11 pages
Proc. SPIE 3323, Smart Structures and Materials 1998: Mathematics and Control in Smart Structures, (24 July 1998); doi: 10.1117/12.316331

Published in SPIE Proceedings Vol. 3323:
Smart Structures and Materials 1998: Mathematics and Control in Smart Structures
Vasundara V. Varadan, Editor(s)