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FROM:
Denys Marques, Felipe Flor, Ricardo Medeiros, Carlos Pagani Jr and Volnei Tita,
“Structural health monitoring of sandwich structures based on dynamic analysis”, Latin American Journal of Solids and Structures, Vol. 15, No. 11, November 2018, http://dx.doi.org/10.1590/1679-78254309
ABSTRACT: This work aims to contribute for the development of shm sys-tems based on vibration methods to be applied on sandwich structures. The main objective is focused on experimental damage identification via changes in the frequency response function (frf) with the usage of damage metrics. Specimens of sandwich structures made from skins in epoxy resin reinforced by glass fiber and a core of pvc foam are manufactured. First, preliminary non-damped finite element (fe) models are performed, and results obtained are used to define the frequency range of interest for the experimental procedure. After that, vibration experimental analyses are carried out on undamaged specimens. The natural frequencies are compared to the preliminary fe results. Second, experimental analyses are performed on damaged specimens with piezoelectric sensors or not. Then, damage metric values are calculated based on frfs for damaged and undamaged structures, which were obtained from experimental and fe analyses (with damping effects). In addition, a new procedure is proposed to improve the quality of results provided by the damage metric. It is shown that the new procedure is very effective to identify the damage using both amplitude and phase from frfs. Lastly, it is discussed the potentialities and limitations of the fe model to predict damage metric values, comparing to experimental data.
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