Eventos Anais de eventos
MecSol 2017
6th International Symposium on Solid Mechanics
Sensitivity analysis on composite plates by using design of experiments
Submission Author:
Luiz Fernando Dos Santos Souza , SC
Co-Authors:
Volnei Tita, Ricardo De Medeiros
Presenter: Luiz Fernando Dos Santos Souza
doi://10.26678/ABCM.MecSol2017.MSL17-0014
Abstract
The use of composite materials, mainly fiber reinforced polymer matrix, on structural components is increasing in the industry, challenging not only the manufacturing process but also the damage detection methods. The main objective of this work consists on developing a methodology to generate an envelop that characterizes an intact composite plate, allowing to improve the robustness of vibration-based methods to structural health monitoring (SHM) system. For this, it is necessary to identify the most important parameters, which have affected the structural behavior, based on the manufacture process and how to differentiate a damage from a manufacture imperfection. To achieve these goals, design of experiments method and computational analysis are used to conduct a structured set of numerical evaluations and identify the four most significant parameters among eleven variables that characterizes the composite plate. The variables analyzed were width, length, plate curvature, ply orientation, thickness, Modulus in fiber direction, modulus in transverse direction, shear modulus in ply plane and poisson coefficient. These parameters were obtained from the experimental analysis of composite plates, made of epoxy resin reinforced by carbon fiber, and aim to obtain data from the variability of the manufacture process. Firstly, free vibration analysis are carried out to find the natural frequencies by using commercial finite element software ABAQUSTM. Afterwards, the set of Frequency Response Functions (FRFs) obtained from the variation of the most significant parameters were compared against the experimental FRF from intact and damaged plates showing the potential and limitations of the method. Finally, it is discussed the influence of the manufacture process on the precision of the SHM systems using vibration-based methods.
Keywords
Structural Heath Monitoring, Vibration-Based Methods, Composite Materials, design of experiments
