Desenvolvimento de metodologias para projeto de estruturas com camada sanduíche amortecedoras

Abstract

Passive control systems for vibration control in structures demonstrate a wide variety of conceptions, as they are results of creative projects focused on specific problems. Usually, they are robust mechanisms and are shown as more efficient alternatives than ordinary and conservative techniques of structural stiffening. Among these systems, it is possible to highlight the ones that use viscoelastic materials (VEM) as damping core, such as sandwich systems. These materials have mechanical properties depending on temperature and, mainly, on the vibration frequency, introducing additional difficulties to the already complex theoretical formulations of the problem. In this work, formulations used to model viscoelastic sandwich systems, such as GHM (Golla-Hughes-MacTavish); ADF (Anelastic Displacement Field); and DF (Fractional Order Derivatives) are taken as basis for the computational simulations considered. Based on the experimental characterization of the VEM’s, the formulations previously mentioned were used to estimate the dynamic behavior of sandwich structures. Finally, strategies aimed at design of sandwich VEM structures are indicated, based on the performance of each of the evaluated formulations, regarding to their ability to simulate the experiments performed.