Abstract
In-service tubular conductors are prone to such anomalies as the wall-thinning defect and hidden corrosion which pose a severe threat to structural integrity. In this paper, a capsule-typed electromagnetic acoustic transducer is proposed for inspection of tubular conductors such as small-diameter pipes subject to external corrosion. An efficient hybrid model of Electromagnetic Acoustic Transduction (EMAT) is established in an effort to reveal the underlying physical phenomena and simulate the resulting responses to external wall-thinning defects in tubular conductors. The model integrates a fast analytical model computing the electromagnetic field and resulting Lorentz force with Finite Element Modeling (FEM) for simulation of ultrasonic field. The established model is corroborated via FEM and experiments, and beneficial to the optimization of the proposed capsule-typed electromagnetic acoustic transducer for non-destructive evaluation of tubular conductors.
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