Damage Detection in a Plate Using Beam-Focused Shear-Horizontal Wave Magnetostrictive Patch Transducers

For efficient non-destructive ultrasonic inspection in plate/shell structures, the development of a guided-wave based method using transducers having good beam directivity, high power and little dispersion is important. To this end, a damage inspection strategy using a set of specially-designed magnetostrictive patch transducers capable of generating beam-focused, non-dispersive shear-horizontal waves is proposed. In the present ultrasonic pitch-catch inspection, only a few single transducers need to be installed around an inspection area. To convert measured wave signals by the transducers into two-dimensional images, a relatively simple yet effective data-processing technique suitable for the employed transducer setting is developed. Sets of experiments were conducted on rectangular plates having one or two circular holes with a diameter of 1 mm or 3 mm. For all experiments, the Gabor-shaped ultrasonic pulses having the center frequencies of 250 kHz and 360 kHz were used. Nomenclature n A = region of influence for a grid point n. s c = shear wave speed. D = interval between solenoids in PSA (Planar Solenoid Array). , () n ij E t = envelope of the voltage output signal at a specific arrival time t from i to j via n. f = center frequency. G = spacing between virtual grid points. n h = the size of n A .

[1]  Dennis Gabor,et al.  Theory of communication , 1946 .

[2]  N. S. Tzannes,et al.  Joule and Wiedemann Effects-The Simultaneous Generation of Longitudinal and Torsional Stress Pulses in Magnetostrictive Materials , 1966, IEEE Transactions on Sonics and Ultrasonics.

[3]  R. B. Thompson.  Generation of horizontally polarized shear waves in ferromagnetic materials using magnetostrictively coupled meander‐coil electromagnetic transducers , 1979 .

[4]  F. Livingstone,et al.  Review of progress in quantitative NDE: Williamsburg, VA, USA, 21–26 June 1987 , 1988 .

[5]  Peter Cawley,et al.  The Potential of Guided Waves for Monitoring Large Areas of Metallic Aircraft Fuselage Structure , 2001 .

[6]  D. Zellouf,et al.  A SAFT algorithm for lamb wave imaging of isotropic plate-like structures , 2002 .

[7]  Darryll J. Pines,et al.  Directional piezoelectric phased array filters for detecting damage in isotropic plates , 2004 .

[8]  V. Giurgiutiu.  Tuned Lamb Wave Excitation and Detection with Piezoelectric Wafer Active Sensors for Structural Health Monitoring , 2005 .

[9]  Hegeon Kwun,et al.  Magnetostrictive Sensor for Generating and Detecting Plate Guided Waves , 2005 .

[10]  P. Cawley,et al.  Omnidirectional guided wave inspection of large metallic plate structures using an EMAT array , 2005, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[11]  Krishnan Balasubramaniam,et al.  A single transmitter multi-receiver (STMR) PZT array for guided ultrasonic wave based structural health monitoring of large isotropic plate structures , 2006 .

[12]  J. Rajagopalan,et al.  A phase reconstruction algorithm for Lamb wave based structural health monitoring of anisotropic multilayered composite plates , 2006 .

[13]  P.D. Wilcox,et al.  On the development and testing of a guided ultrasonic wave array for structural integrity monitoring , 2006, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[14]  Lingyu Yu,et al.  In-Situ Optimized PWAS Phased Arrays for Lamb Wave Structural Health Monitoring , 2007 .

[15]  Bc Lee,et al.  Lamb wave propagation modelling for damage detection: II. Damage monitoring strategy , 2007 .

[16]  Lingyu Yu,et al.  In-Situ Imaging of Crack Growth with Piezoelectric Wafer Active Sensors , 2006 .

[17]  Joseph L. Rose,et al.  Active health monitoring of an aircraft wing with embedded piezoelectric sensor/actuator network: I. Defect detection, localization and growth monitoring , 2007 .

[18]  Victor Giurgiutiu,et al.  Single Mode Tuning Effects on Lamb Wave Time Reversal with Piezoelectric Wafer Active Sensors for Structural Health Monitoring , 2007 .

[19]  Carlos E. S. Cesnik,et al.  Guided Wave Experimentation Using CLoVER Transducer for Structural Health Monitoring , 2008 .

[20]  P. Fromme,et al.  MONITORING OF PLATE STRUCTURES USING GUIDED ULTRASONIC WAVES , 2008 .

[21]  V. Giurgiutiu,et al.  In situ 2-D piezoelectric wafer active sensors arrays for guided wave damage detection. , 2008, Ultrasonics.

[22]  Seung Hyun Cho,et al.  Beam-focused shear-horizontal wave generation in a plate by a circular magnetostrictive patch transducer employing a planar solenoid array , 2008 .