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18 April 2008 Behavior of thin lightweight structures under propagating waves
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In this study, we examine the propagation of mechanical waves on thin lightweight structures, with the aim of developing a method of crack detection in such structures. By comparing the response of healthy and cracked samples, we are sometimes able to differentiate between the two. Using a network of sensors it would be possible to determine the presence of a crack on a structure that is remote. Experimental work has been performed with single-crystal Silicon thin plates and a thin rectangular sheet of steel. The Silicon plates were tested healthy and cracked, and the steel was only tested when healthy. Piezo-ceramic stacks were used to provide actuation and sensing, and wave solutions to the equation of motion are obtained for the Silicon plate. Calculated and experimental results agree reasonably well.
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Eric A. Petersen, Katherine A Barnes, and Umesh A. Korde "Behavior of thin lightweight structures under propagating waves", Proc. SPIE 6928, Active and Passive Smart Structures and Integrated Systems 2008, 692826 (18 April 2008);

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