Abstract
A unique composite material called Continuous Wave Fiber Composite (CWFC) or wavy composite has shown great promise in improving damping properties of composite structures. In wavy composites, the fiber is oriented in a continuous sine wave which produces a varying fiber angle. This new material has exhibited high levels of damping when two layers, with wave patterns 180 degrees out of phase, surround a layer of viscoelastic material. This research investigated the acoustic transmission loss and flexural damping of hat-stiffened panels produced with graphite/epoxy wavy composite material. The 22- panel test matrix included sixteen exploratory panels used to determine the most highly damped design, four optimized panels based on the best exploratory design, and two control panels including one panel without CWFC and another without VEM or CWFC. The panels were tested to quantify the acoustic transmission loss and flexural damping under free-free boundary conditions. Hat-stiffened panels produced with graphite/epoxy wavy composites provide 17% higher damping than constrained layer damping and slightly higher transmission loss over panels made with conventional unidirectional materials.
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