Electromagnetic Ultrasonic Guided Waves
This book introduces the fundamental theory of electromagnetic ultrasonic guided waves, together with its applications. It includes the dispersion characteristics and matching theory of guided waves; the mechanism of production and theoretical model of electromagnetic ultrasonic guided waves; the effect mechanism between guided waves and defects; the simulation method for the entire process of electromagnetic ultrasonic guided wave propagation; electromagnetic ultrasonic thickness measurement; pipeline axial guided wave defect detection; and electromagnetic ultrasonic guided wave detection of gas pipeline cracks.
This theory and findings on applications draw on the author’s intensive research over the past eight years. The book can be used for nondestructive testing technology and as an engineering reference work. The specific implementation of the electromagnetic ultrasonic guided wave system presented here will also be of value for other nondestructive test developers.
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2 Analytical Method of EMAT Based on Lorentz Force Mechanism
3 Analytical Method of EMAT Based on Magnetostrictive Mechanism
4 The Propagation Characteristics of Ultrasonic Guided Waves in Plate and Pipe
5 Simulation of Interactions Between Guided Waves and the Defects by Boundary Element Method
6 Finite Element Simulation of Ultrasonic Guided Waves
7 Applications of the Electromagnetic Ultrasonic Guided Wave Technique
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A0 Lamb amplitude value analytical axial direction axisymmetric Bessel function bias magnetic field boundary conditions calculated circuit circumferential Lamb waves cluster coils coil conductor coil’s COMSOL Multiphysics coordinate system crack current density dispersion curves dynamic magnetic field eddy current EMAT based excitation coil excitation signal expressed ferromagnetic ferromagnetic material finite element fold number following equation guided wave EMAT guided wave mode guided wave propagation Lamb wave mode Lorentz force magnetic induction intensity magnetostrictive effect magnetostrictive force magnetostrictive mechanism meander coil method mode guided wave nickel belt nickel strap obtained parameters particle displacement phase velocity pipe pipeline point P1 received signal receiving coil rectangular groove reflection and transmission S0 Lamb wave S0 mode scalar potential SH guided wave shown in Fig skin effect static bias magnetic surface symmetric defect transducer transmission coefficient ultrasonic guided wave ultrasonic wave velocity dispersion curves voltage wave propagation waveform width