Model updating of uncertain parameters of carbon/epoxy composite plates using digital image correlation for full-field vibration measurement. (15th July 2020)

• Record Type: Journal Article
• Authors: Cuadrado, M.; Pernas-Sánchez, J.; Artero-Guerrero, J.A.; Varas, D.
• Is Part Of: Measurement. Volume 159(2020)
• Publication Date: 2020-07-15
• Subjects: Model updating -- Experimental modal data -- Digital image correlation (DIC) -- Uncertain mechanical properties -- Carbon/epoxy composite; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2020.107783
• Languages: English
• ISSNs: 0263-2241

Abstract

Graphical abstract: Highlights: Low time-consuming identification of modal parameters using 3D DIC. Comparison of results applying 3D DIC and a traditional experimental method. 3D DIC allowed obtaining much smoother mode shapes, useful for damage localization. Drastically reduced discrepancies of updated parameters with measured ones. Very similar results of model updating based on the two experimental methods. Abstract: Model updating is usually based on the contrast between the modal characteristics predicted by the models and those experimentally identified. Traditional experimental methods are based on the use of contacting sensors, but more recently other techniques as 3D Digital Image Correlation (DIC) have also been used successfully. In this paper the results obtained by applying these alternative techniques are compared, to obtain physically-sound models of carbon/epoxy composite plates. Primarily a roving hammer exciting the plates at evenly distributed degrees of freedom (DoF), and a mono-axial accelerometer attached to a single DoF reference point, have been used for modal identification. Alternatively, high speed cameras were applied to measure full-field vibrations of the plates. 3D DIC allowed obtaining a lower number of natural frequencies but much smoother mode shapes and similar results for model updating. The experimental setup has been benchmarked using two different sets of plates varying thickness and ply stacking.