Diffraction, attenuation, and source corrections for nonlinear Rayleigh wave ultrasonic measurements.

Area of Science:

• Materials Science
• Ultrasonic Testing
• Nonlinear Acoustics

Background:

• Nonlinear ultrasonic Rayleigh wave propagation is crucial for material characterization.
• Measurements are often affected by diffraction, attenuation, and source nonlinearity.
• Accurate quantification of material nonlinearity is essential for defect detection and performance prediction.

Purpose of the Study:

• To develop a theoretical framework for correcting ultrasonic measurements.
• To propose a method for extracting the nonlinearity parameter β11.
• To validate the proposed method through quantitative experiments.

Main Methods:

• Analytical modeling and experimental considerations for measurement correction.
• Nonlinear least squares curve-fitting algorithm for nonlinearity parameter extraction.
• Quantitative experiments on aluminum alloys (2024, 7075) and duplex stainless steel.

Main Results:

• A new theoretical framework was established for correcting ultrasonic measurements.
• The proposed curve-fitting method effectively extracts the nonlinearity parameter β11.
• Experimental results on aluminum alloys confirmed source nonlinearity predictions and validated the method.
• Analysis of duplex stainless steel specimens showed improved conclusions from heat treatment studies.

Conclusions:

• The developed method provides accurate measurements of nonlinear ultrasonic Rayleigh wave propagation.
• The technique is effective for characterizing material nonlinearity in metals.
• This research advances the application of nonlinear ultrasonics in materials science and engineering.