The development of a magnetostrictive sensor for generating and detecting guided waves in ferromagnetic plate is described. The sensor consists of a channel-shaped core and coils wound around the core along its length. It is shown that the sensor is capable of generating and detecting both the symmetric and antisymmetric Lamb wave modes and the shear horizontal wave modes in plates. It is also found that the beam pattern produced by the sensor follows the pattern expected for a line source in a two-dimensional medium.
1.
M.
Redwood
, Mechanical Waveguides
, The Propagation of Acoustic and Ultrasonic Waves in Fluids and Solids With Boundaries
(Pergamon
, New York, 1960).2.
P.
Cawley
and D.
Alleyne
, 1996, “The Use of Lamb Waves for the Long Range Inspection of Large Structures
,” Ultrasonics
0041-624X 34
, pp. 287
–290
.3.
D. N.
Alleyne
and P.
Cawley
, 1996, “The Excitation of Lamb Waves in Pipes Using Dry-Coupled Piezoelectric Transducers
,” J. Nondestruct. Eval.
0195-9298 15
, pp. 11
–20
.4.
J. L.
Rose
, K. M.
Rajana
, and F. T.
Carr
, 1994, “Ultrasonic Guided Wave Inspection Concepts for Steam Generator Tubing
,” Mater. Eval.
0025-5327 52
, pp. 307
–311
.5.
H.
Kwun
and C. M.
Teller
, 1994, “Detection of Fractured Wires in Steel Cables Using Magnetostrictive Sensors
,” Mater. Eval.
0025-5327 52
, pp 503
–507
.6.
H.
Kwun
and K. A.
Bartels
, 1998, “Magnetostrictive Sensor Technology and Its Applications
,” Ultrasonics
0041-624X 36
, pp. 171
–178
.7.
U.S. Patent Nos. 5,456,113, 5,457,994, 5,581,037, 6,294,912, 6,391,262, 6,429,650, 6,624,628, and pending patents.
8.
H.
Kwun
and K. A.
Bartels
, 1996, “Experimental Observation of Elastic Wave Dispersion in Bounded Solids of Various Configurations
,” J. Acoust. Soc. Am.
0001-4966 99
, pp. 962
–968
.9.
H.
Kwun
, S. Y.
Kim
, and G. M.
Light
, 2003, “The Magnetostrictive Sensor Technology for Long-Range Guided-Wave Testing and Monitoring of Structures
,” Mater. Eval.
0025-5327 61
, pp. 80
–84
.10.
D. N.
Alleyne
and P.
Cawley
, 1992, “Optimization of Lamb Wave Inspection Techniques
,” NDT & E Int.
0963-8695 25
, pp. 11
–22
.11.
R.
Murayama
, 1996, “Driving Mechanism on Magnetostrictive Type Electromagnetic Acoustic Transducer for Symmetrical Vertical-Mode Lamb Wave and for Shear Horizontal-Mode Plate Wave
,” Ultrasonics
0041-624X 34
, pp. 729
–736
.12.
R. C.
Williams
, 1959, “Theory of Magnetostrictive Delay Lines for Pulse and Continuous Wave Transmission
,” IEEE Trans. Ultrason. Eng.
0893-6706, UE-7
, pp. 16
–38
.13.
N. S.
Tzannes
, 1966, “Joule and Wiedemann Effects–The Simultaneous Generation of Longitudinal and Torsional Stress Pulses in Magnetostrictive Materials
,” IEEE Trans. Sonics Ultrason.
0018-9537, SU-13
, pp. 33
–41
.14.
T. L.
Szabo
and H. M.
Frost
, 1976, “SAW Electromagnetic Transducer Design for Nondestructive Evaluation Applications
,” IEEE Trans. Sonics Ultrason.
0018-9537, SU-23
, pp. 323
–328
.15.
R. B.
Thompson
, 1978, “A Model for the Electromagnetic Generation of Ultrasonic Guided Waves in Ferromagnetic Metal Polycrystals
,” IEEE Trans. Sonics Ultrason.
0018-9537, SU-25
, pp. 7
–15
.16.
DISPERSE, 1999,
A system for generating dispersion curves, Version 2.0
, Imperial College, University of London.17.
J.
Krautkramer
and H.
Krautkramer
, 1990, Ultrasonic Testing of Materials
, 4th ed., Springer Verlag
, New York, Chap. 16, Sec. 2.18.
J.
Krautkramer
and H.
Krautkramer
, 1990, Ultrasonic Testing of Materials
, 4th ed. Springer Verlag
, New York, Chap. 4.Copyright © 2005
by American Society of Mechanical Engineers
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