The Effectiveness of Operational Modal Analysis (OMA) for Detecting Saw Cut Damage in Fiberglass Reinforced Epoxy

Abstract:

This study attempts to apply vibration based damage detection method specifically operational modal analysis (OMA) on fiberglass reinforced epoxy plate. OMA is used on undamaged fiber glass reinforced epoxy plate to extract the modal parameters and after which the procedure is extended to saw cut damage fiberglass reinforced epoxy plate. Both healthy and damaged composite material are tested for different boundary conditions i.e. free-free on 4 edges, 1 edge clamped, 2 edges clamped, 3 edges clamped and 4 edges clamped condition. Then result of frequency from OMA was compared analytically with finite element method. Based on the results, it shows that a high deviation between OMA and finite element method can be observed. Result of frequency from OMA was then compared with Experimental Modal Analysis (EMA) to validate the effectiveness of OMA method. It is shown that results obtained from OMA are in good correlation with results obtained from EMA.

• Periodical: Applied Mechanics and Materials (Volume 393)
• Pages: 649-654
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.393.649
• Online since: September 2013
• Authors: Haizuan Abd Rahman, Ahmad Azlan Mat Isa
• Keywords: Composite Material, Finite Element Method (FEM), Frequency, Operational Modal Analysis (OMA), Vibration Based Damage Detection

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