Identification of elastic parameters on thin plates of composite materials / Identificação de parametros elasticos em placas finas de materiais compositos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

In this work two methods are analyzed to identify elastic constants in composite materiais of structural application. They are methods that have nondestructive eharacteristie, comprised of simple tests and don t require high computational efforts. They can be employed to anisotropic materials as well as isotropic or ortotropic materials, making them useful alternative tools to composite materiais studies. In the first method, both natural frequencies and suitable mode shapes are input data for the solution of a linear system that come from differential equation that governs the transverse vibration of a free-free thin plate. Elastic constants of this equation are unknown parameters and are associated with vibration mode shape. Numerical simulations of Finite Element software, Ansys 7.0, and experimental modal analysis indicate the accuracy of this method. The second method refers to an optimum design problem and its solution is obtained by combining both Finite Elements and optimization methods in a single eommercial software, Ansys 7.O. The modal analysis is required to obtain only the natural frequencies that are the variables used in the objective function. The second method is verified using numerical simulations and tested experimentally with the same isotropic steel plate used in the first method. Results obtained for this steel plate from both methods were highly satisfactory. In relation to the anisotropic plate, results obtained ftom the second method weren t satisfactory

ASSUNTO(S)

vibration mechanics otimização estrutural modal analysis analise modal metodo dos elementos finitos structural optimization materiais compostos composite materials mecanica - vibração finite element method

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