Ultrasonic Materials Characterization, Nonlinear Acoustics and Air-Coupled Ultrasonic Testing
Dan Barnard
Research Scientsit III
dbarnard@iastate.edu
(515) 294-8064
Materials Properties and Characterization
- Measurement of elastic moduli at a range of temperatures
- Characterization of microstructure and microstructural features such as grain size, shape, texture, etc.
- Measurement of ultrasonic properties (velocity, atten., FOM)
Nonlinear Acoustics
- Second Harmonic Generation (SHG) in pitch/catch and TTU.
- Measurement of nonlinearity parameter, b (absolute value).
- Calibration of piezoelectric transducers for absolute displacement measurement (contact and immersion probes)
- Nonlinear Resonance Ultrasound Spectroscopy (NRUS) for material nonlinearity assessment
Air-Coupled Ultrasonics
- Novel applications of air-couple ultrasonics
- Detection of disbond, delam, marcels, resin starvation in composites
- Application of bulk, plate and surface modes for defect and damage detection in composite materials
