Woven textiles are used as reinforcement for polymer-based composites: warp and fill fiber tows are interlaced into each other to form a layer. The aerospace industry has been the primary driving force in the use of woven textile reinforced composites. However their use in aircraft structures requires a detailed assessment of their quality. The goal of this paper is to investigate the effect of a fiber misorientation defect on the modal properties of glass-fiber woven textile reinforced composites using experimental characterization and finite element modeling. Several composite panels with controlled misalignment defects were produced using VARTM process. Then, the samples were inspected using a vibration analyzer. In addition, finite element modeling was performed to simulate the effect of fiber misorientation on the mode shapes and frequency response function (FRF) of thin composite plates during vibration testing. It was observed that the fiber orientation affects the dynamic behavior of the composite samples. As the fiber angle increases, the natural frequencies of the plate decrease. In addition, higher mode shapes appear to be more sensitive to fiber misalignment. The same trend was observed in the finite element modeling results with a clear effect of the fiber orientation defect seen in FRF response and higher mode shapes.
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