Abstract
This paper proposes an inspection technique using Lamb waves to detect a disbond in a CFRP skin-stringer structure. This technique employed the pitch-catch method using two piezoelectric elements especially designed for the low-frequency Lamb A_0 mode. We measured the arrival times of the transmitted A_0 mode as a function of disbond length. A remarkable delay in the arrival time due to the disbond was detected, and its length could be calculated based on a simple model for Lamb-wave propagation. We successfully detected and evaluated the disbond using the proposed technique and confirmed its ability to inspect the skin-stringer structure.
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