In this work, an experiment for early detection of cracks caused by corrosion in engineering structures using nonlinear ultrasonic techniques complemented with conventional techniques is presented. The use of nonlinear effects of ultrasonic has opened a new field in this regard. Higher or lower order harmonics, resonance frequency changes and intermodulation distortion are originated in the propagation of finite amplitude ultrasonic waves (particularly of high-power) and their interaction with discontinuities, such as cracks, interfaces and gaps. The experimental tests use two types of structural elements which are proofs of concepts: a beam and a pillar base, which are the most common problem in the context of building industry.
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