Acousto-Ultrasonics: Theory and Application

Front Cover
J. Duke
Springer Science & Business Media, Nov 11, 2013 - Technology & Engineering - 353 pages
Finding and slzmg cracks and other crack-like discontinuities has been the center of attention for scientists and engineers developing and using nondestructive evaluation (NDE) technology. However, with advanced mate rials being "engineered" and used in critical structural components, a new for NDE has emerged. Whereas many traditional engineering materi challenge als fail due to the initiation and self-similar propagation of a crack, reinforced composite materials degrade and fail in a manner more analogously to the collapse of a structure. Consequently the NDE of such materials involves assessing the combined effect of the material's damaged condition rather than identifying and sizing single critical imperfection. In 1979 Alex Vary, seeking to address the challenge confronting the NDE of advanced fiber reinforced composite materials began work on a new method of materials characterization. Focusing on the problem of evaluating graphite fiber reinforcedl epoxy laminated plates; Vary used a piezoelectric transducer to excite a mechanical disturbance in a plate and, with a sensi tive piezoelectric transducer monitored the disturbance on the same surface of the plate. (Placing the transducers on the same surface was primarily for practical purpose but their displacement in the direction of anticipated service load was of fundamental significance!) To quantify this observation, he counted the number of excursions, of the resulting electrical signal, above a arbitrary voltage threshold; a procedure frequently used for acoustic emission signal analysis.
 

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Contents

The AcoustoUltrasonic Approach e o e o e o e o e o e o e e o e o e o e o e e o e o e o e o e o e e o
19
Diffuse Waves for Materials NDE
35
Low Frequency Flexural Wave Propagation in Laminated
45
Preliminary Evaluation of NonContact AcoustoUltrasonic
67
Utilization of Oblique Incidence in AcoustoUltrasonics
79
Ultrasonic Welocity Studies of Composite and Heterogeneous
93
AcoustoUltrasonic Wave Propagation in Composite Laminates
111
Ray Propagation Path Analysis of AcoustoUltrasonic Signals
127
Electromagnetic Transducers for Generation and Detection
209
Applications and Advantages of Dry Coupling Ultrasonic
221
J A Brunk C J Valenza and M C Bhardwaj
237
Considerations for Developing Calibration Standards
247
Test Conditions in Stress Wave Factor Measurements
259
Measurement of the Energy Content in AcoustoUltrasonic Signals
275
Applications to Wire Rope Wood Fiber
283
An AcoustoUltrasonic Method for Evaluating Wood Products
301

Nondestructive Evaluation of Composite Material Using
143
Experimental and Theoretical Analysis of Backscattering Mechanisms
151
Statistical Evaluation of Quality in Composites Using the Stress Wave
165
Application of AcoustoUltrasonics to Quality Control and Damage
177
Predicting Damage Development in Composite Materials Based
191
Laser Generated Ultrasound
201
MultiParameter MultiFrequency AcoustoUltrasonic
311
TransPly Crack Density Detection by AcoustoUltrasonics
319
Application of AcoustoUltrasonics for Predicting
327
AcoustoUltrasonic Evaluation of the Strength of Composite
345
Index
351
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