This paper describes a fast and non-destructive method for the determination of the four complex engineering constants of orthotropic sheet materials: (E{sub}1){sup}*, (E{sub}2){sup}*, (V{sub}12){sup}* and (G{sub}12){sup}*. The determination of the real part (representing the elastic behaviour) and the imaginary part (representing the damping behaviour) is based on the measurement of the vibrational response of a rectangular test plate, submitted to a controlled excitation. Simultaneously, a numerical model of the test plate is updated until the computed vibrational behaviour matches the measurements. The whole identification procedure, this means the measurement of the vibrational response as well as the calculations, is directed by a menu-driven program running on a Personal Computer.
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