By Songling Huang, Shen Wang, Weibin Li, Qing Wang
This e-book introduces the elemental thought of electromagnetic ultrasonic guided waves, including its functions. It contains the dispersion features and matching idea of guided waves; the mechanism of construction and theoretical version of electromagnetic ultrasonic guided waves; the influence mechanism among guided waves and defects; the simulation strategy for the whole strategy of electromagnetic ultrasonic guided wave propagation; electromagnetic ultrasonic thickness size; pipeline axial guided wave disorder detection; and electromagnetic ultrasonic guided wave detection of gasoline pipeline cracks.
This concept and findings on purposes draw at the author’s in depth study over the last 8 years. The booklet can be utilized for nondestructive trying out expertise and as an engineering reference paintings. the categorical implementation of the electromagnetic ultrasonic guided wave method offered the following can be of price for different nondestructive attempt developers.
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Additional info for Electromagnetic Ultrasonic Guided Waves
The coil of EMAT in the dynamic magnetic ﬁeld will generate an induced electromotive force, which is the coil’s receiving signal. In the signal receiving process of the coil, the magnetic ﬁeld in the solving area is provided by the eddy current density in the specimen and the source current density. Generally, the receiving coil is in an open circuit state and the total current of the receiving coil is zero. 23). 1 @A r @ À r2 A þ r À l @t S @t ZZ Ads ¼ JL ð2:23Þ Xc After solving the vector magnetic potential of each region using the above equation, the induced electromotive force of the coil can be calculated.
37). ! 38). 38), Tx and Ty indicate the elastic sample’s internal forces on the boundary. Because the specimen satisﬁes the boundary condition of traction free, the integral value on the right hand of the equation is zero. 2 The Weak Form of Coupled Equations in the Axisymmetric Coordinate System For the spiral coil or EMAT used for the testing of the pipeline in the axial direction, the coil’s structure and specimen satisfy the axisymmetric condition. In this case, the problem of three-dimensional analysis can be transformed into a two-dimensional problem in the axisymmetric coordinates.
We changed the liftoff distance of the transmitter and receiver, respectively, to investigate the effect of liftoff by changing the distance between coil and specimen and calculating the amplitude value of the received signal. The results are shown in Figs. 28. It can be seen from Figs. 28 that the amplitude exponentially decreases versus the liftoff distance for both transmitter and receiver. So, it is critical to minimize the coil’s liftoff distance for the design of EMAT. Through the above analysis, the effect of the coil fold’s number on the performance of EMAT can be explained by the investigation of the mechanical ﬁeld.
Electromagnetic Ultrasonic Guided Waves by Songling Huang, Shen Wang, Weibin Li, Qing Wang