Eventos Anais de eventos
MecSol 2017
6th International Symposium on Solid Mechanics
STRUCTURAL HEALTH MONITORING FOR SANDWICH STRUCTURES
Submission Author:
Denys Eduardo Teixeira Marques , SP , Brazil
Co-Authors:
Felipe Flor, Ricardo De Medeiros, Carlos Pagani, Volnei Tita
Presenter: Volnei Tita
doi://10.26678/ABCM.MecSol2017.MSL17-0086
Abstract
This work aims to contribute for the development of SHM systems based on vibration methods to be applied on sandwich structures. The main objective is focused on the damage identification. Specimens of a sandwich structure made of skins in epoxy resin reinforced by glass fiber and a core of PVC foam are manufactured. First, finite element models are developed in order to analyze the dynamic characteristics of undamaged and damaged structures with presence or not of two piezoelectric sensors. Then, vibration experimental analyses are performed on undamaged specimens of sandwich structures. The mode shapes and natural frequencies are compared to the computational results. Second, vibration experimental analyses are carried out on undamaged and damaged specimens of sandwich structures with piezoelectric sensors or not. Finally, a traditional damage metric is calculated based on Frequency Response Functions obtained from computational and experimental analyses. However, this work brings a new procedure in order to improve the quality of results provided by this damage metric. By one hand, the damage metric values showed that the new procedure is effective to identify the damage using both amplitude and phase experimental data. By the other hand, for computational analysis, the damage metric values are not effective, because the finite element models were not able to simulate the dynamic behavior of the sandwich structures.
Keywords
Structural Health Monitoring, Sandwich Structures, Vibration Methods, Finite Element Analysis, experimental analysis
