UNCERTAINTY ANALYSIS OF SMART COMPOSITE MATERIALS
Fabian Andres Lara-Molina1; Edson Hideki Koroishi1; Albert Willian Faria2; Renan Franco Corrêa1
1 Federal University of Technology - Paraná; 2 Federal University of Triangulo Mineiro
Resumo
The recent years have seen the appearance of innovative materials, as the so-called composite materials, particularly in aerospace applications. The structures constructed by this innovated arrangement are characterized by lightness, mechanical resistance, and the possibility to be optimized for a specific working condition. Unlike the regular materials (steel, aluminum, etc), the composites are formed by various layers with different fiber orientations, which allows to be adequated for a particular application. Aircraft, aerospace and automotive industries are examples in which the composite materials have been increasingly used. Generally, piezoelectric layers (PZT sensor/actuator patch) are incorporated to the composite materials in order to offer potential benefits in a wide range of applications such as structural health monitoring, noise suppression, precision positioning and active vibration control. Thus, the set encompassing the composite material, piezoelectric layers and monitoring and control systems, is known as Smart Composite Structure. Moreover, the industrial applications require mechanical systems working with optimal performance subject to specific operational conditions, which demands: high reliability, robustness against environmental conditions and low operating requirements. Consequently, it is necessary to develop reliable numerical models that take into account uncertain parameters, and allow the prediction of the dynamic behavior of the system under realistic conditions. The present contribution is dedicated to the analysis of uncertainties affecting the dynamic behavior of a piezoelectric actuator bonded to a composite structure forming a so-called smart composite structure. Serendipity-type finite element based on first-order shear deformation theory with rectangular shape, eight nodes, five mechanical degrees of freedom (DOF) per node and eight electrical DOF per piezoelectric layer is established for the composite structural model. Additionally, a mixed theory that uses a single equi
Palavras-chave: Modeling; Numerical Simulation and Optimization; Nonlinear Dynamics and Complex Systems; Stochastic Models