Acousto-Ultrasonics

1. Front Matter

   Pages i-ix

   PDF

2. Keynote

   1. The Acousto-Ultrasonic Approach

      • Alex Vary

      Pages 1-21

3. Theory — Wave Propagation for Acousto-Ultrasound

   1. Interaction of Ultrasonic Waves with Layered Media

      • Adnan H. Nayfeh, Timothy W. Taylor

      Pages 23-34

   2. Diffuse Waves for Materials NDE

      • R. L. Weaver

      Pages 35-43

   3. Low Frequency Flexural Wave Propagation in Laminated Composite Plates

      • B. Tang, E. G. Henneke II, R. C. Stiffler

      Pages 45-65

   4. Preliminary Evaluation of Non-Contact Acousto-Ultrasonic Displacement Fields in Polymeric Matrix Composite

      • James H. Williams Jr., Peter Liao

      Pages 67-78

   5. Utilization of Oblique Incidence in Acousto-Ultrasonics

      • A. Pilarski, J. L. Rose, K. Balasubramaniam, J. Da-Le

      Pages 79-91

4. Data Interpretation

   1. Ultrasonic Velocity Studies of Composite and Heterogeneous Materials

      • Subhendu K. Datta, Hassel M. Ledbetter, Arvind H. Shah

      Pages 93-109

   2. Acousto-Ultrasonic Wave Propagation in Composite Laminates

      • S. M. Moon, K. L. Jerina, H. T. Hahn

      Pages 111-125

   3. Ray Propagation Path Analysis of Acousto-Ultrasonic Signals in Composites

      • Harold E. Kautz

      Pages 127-142

   4. Nondestructive Evaluation of Composite Material Using Ultrasound

      • V. K. Kinra, V. Dayal

      Pages 143-150

   5. Experimental and Theoretical Analysis of Backscattering Mechanisms in Fiber-Reinforced Composites

      • R. A. Roberts, J. Qu, J. D. Achenbach

      Pages 151-164

   6. Statistical Evaluation of Quality in Composites Using the Stress Wave Factor Technique

      • A. Madhav, J. A. Nachlas

      Pages 165-175

   7. Application of Acousto-Ultrasonics to Quality Control and Damage Assessment of Composites

      • Ramesh Talreja

      Pages 177-190

   8. Predicting Damage Development in Composite Materials Based on Acousto-Ultrasonic Evaluation

      • J. C. Duke Jr., M. T. Kiernan

      Pages 191-200

5. Sources/Detectors

   1. Laser Generated Ultrasound

      • A. Sarrafzadeh, R. J. Churchill, M. G. Niimura

      Pages 201-207

   2. Electromagnetic Transducers for Generation and Detection of Ultrasonic Waves

      • P. J. Latimer, H. L. Whaley

      Pages 209-220

   3. Applications and Advantages of Dry Coupling Ultrasonic Transducers for Materials Characterization and Inspection

      • J. A. Brunk, C. J. Valenza, M. C. Bhardwaj

      Pages 221-237

   4. Fiber Waveguide Sensors of Stress Waves in Solids

      • Richard O. Claus, J. A. Wiencko, R. E. Rogers

      Pages 239-246

6. Calibration and Method Implementation

   1. Considerations for Developing Calibration Standards for Acousto-Ultrasonic Inspection

      • James D. Leaird, Matthew C. Kingdon

      Pages 247-257

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.

• cement
• cracks
• damage
• engine
• glass
• laser
• materials
• materials characterization
• scattering
• sensors
• service
• structure
• surface
• technology
• transducer

• Virginia Polytechnic Institute and State University, Blacksburg, USA

  John C. Duke

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