Dynamic characterization of fiber glass reinforced epoxy plate using OMA for damage detection

Composite materials with nonlinear properties are proned to subsurface damages such as core crack, delamination, etc., that are difficult to detect visually. Even though vibration response as damage detection method is widely used in engineering applications, its usage is to nonlinear and nonhomogenous properties especially in composite materials is still limited. This paper attempts to apply vibration based damage detection method specifically operational modal analysis (OMA) on fiber glass reinforced epoxy plate. OMA is used on undamaged fiber glass reinforced epoxy plate to extract the dynamic parameters and after which the procedure is extended to damage fiber glass reinforced epoxy plate. Both 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. Results of these experimental setups will be compared to establish modal parameters on undamaged and damaged composites plate.