Abstract
Significant backscattering enhancements occur for thin circular plates tilted close to the extensional wave coupling angle. Two mechanisms responsible for these enhancements are explored. The response that is initially the largest is from a leaky extensional wave that travels along the diameter and reflects from the plate edge. The second response is due to extensional waves traveling along off-diameter paths. When these waves strike the plate edge, they mode convert into shear waves. These shear waves strike the opposite edge and mode convert into extensional waves that can reradiate back towards the source. These mechanisms are confirmed with backscattering measurements and images of the plate motion from acoustic holography.
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