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Recent advancement on the NDE of structures by means of highly nonlinear solitary waves

In this paper, we propose the use of highly nonlinear solitary waves (HNSWs) for the nondestructive evaluation of aluminum lap-joints bonded by high-strength two ton epoxy. A HNSW transducer was used to generate and detect the propagation of incident and reflected HNSWs. The time of flight and amplitude ratio of the reflected HNSW were adopted to interpret the bonding condition of aluminum lap-joints. Two experiments are reported. In the first experiment we monitor the curing process of a two-ton epoxy at aluminum lap-joints. In the second experiment we detect different bonding condition of aluminum lap-joints such as good bonding, fair bonding (with undesired resin to hardener ratios), slide bonding, and no bonding, after the epoxy was fully cured. The results of experiments show the proposed method is able to detect different bonding conditions of aluminum lap-joints.