Influence of geometric and material parameters on the damping properties of multilayer structures

Abstract

In this paper, we investigate the influence of deviations in the design and implementation parameters on the damping properties of multilayer viscoelastic structures. This work is based on a numerical approach, which uses recently developed solid-shell elements that have been specifically designed for the modeling of multilayer structures. The originality in the current study lies in the analysis of variation in the design parameters, which could be of geometric or material type. Indeed, although several models have been proposed to study variability, they remain mostly complex to implement. Our approach is rather simple, and is based on the uncertainty on the actual values of several parameters in some welldefined intervals. The developed method is applied to the vibration modeling of multilayer structures, with elastic faces and viscoelastic core material. The resulting problem is discretized by using quadratic solid-shell finite elements. To solve the associated nonlinear equations, we adopt the method that couples the homotopy technique to the Asymptotic Numerical Method (ANM) as well as the Automatic Differentiation (AD) and path continuation. The obtained results provide useful information on the error tolerance margin that could be allowed without compromising structural integrity.

In-core heat distribution control for adaptive damping and stiffness tuning of composite structures

“…They are typically used in multilayered composites [3], in particular as cores in order to maximise the shear strain, hence inducing increase of dissipation [4]. A lot of research efforts have been devoted to the optimization of the design of multilayered composites [5][6][7][8][9]: geometry, materials and boundary conditions may have strong impact on the energy dissipation and should be properly chosen. In particular, glass transition of polymer materials can be a key factor for high damping performances: viscoelastic materials that exhibit a fast transition between the rubbery and the glassy states are particularly interesting because of their high loss factor values at glass transition [10,11].…”