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Pulsed Rayleigh wave scattered at a surface crack.

X Jian¹, S Dixon, N Guo

¹University of Warwick, Department of Physics, Ultrasonic Group, Coventry CV4 7AL, UK. x.jian@warwick.ac.uk

|June 27, 2006

Summary

This study simulates surface cracks using Rayleigh waves and finite element analysis. It found in-plane particle velocity enhancement near defects, useful for ultrasonic detection and crack depth gauging.

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Area of Science:

Materials Science
Non-Destructive Testing
Solid Mechanics

Background:

Surface breaking cracks are critical defects in metallic structures.
Ultrasonic Rayleigh waves are sensitive to surface imperfections.
Understanding wave interaction with defects is key for structural integrity assessment.

Purpose of the Study:

To investigate Rayleigh wave scattering by simulated surface cracks (machined slots) in aluminum.
To analyze the behavior of in-plane and out-of-plane particle velocities near these defects.
To explain discrepancies in reflection/transmission coefficients and explore crack depth gauging methods.

Main Methods:

Finite element method (FEM) simulations.
Modeling of Rayleigh wave propagation and scattering.

Related Experiment Videos

Analysis of pulsed wideband Rayleigh waves (590 kHz center frequency).

Calculation of reflection and transmission coefficients.

Main Results:

Rayleigh wave scattering by slots of varying depths (0.5 mm to 20 mm) was calculated.
Significant enhancement of in-plane particle velocities near slots was predicted, exceeding out-of-plane components.
Mode-converted surface skimming longitudinal waves contribute to in-plane velocity enhancement.
Later-arriving Rayleigh waves from crack reverberations were observed.

Conclusions:

In-plane sensitive ultrasonic detectors are effective for detecting surface defects due to predicted velocity enhancements.
Observed reverberations can potentially be used for gauging the depth of surface-breaking cracks.
FEM simulations provide valuable insights into ultrasonic wave interaction with simulated cracks.