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The interaction of Lamb waves with defects.

D N Alleyne¹, P Cawley

¹Dept. of Mech. Eng., Imperial Coll., London.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1992

Summary

This study quantifies Lamb wave interactions with simulated defects using finite-element analysis and experiments. Lamb wave sensitivity to notches depends on various factors, enabling defect detection when wavelength-to-depth ratios approach 40.

Area of Science:

Materials Science
Mechanical Engineering
Non-Destructive Testing

Background:

Lamb waves are utilized for non-destructive testing (NDT) to detect material defects.
Understanding Lamb wave interaction with defects is crucial for accurate structural health monitoring.

Purpose of the Study:

To investigate the interaction of individual Lamb waves with simulated defects (notches).
To develop and validate a quantitative method for analyzing these interactions.
To determine the sensitivity of different Lamb wave modes to various notch geometries and sizes.

Main Methods:

Finite-element analysis (FEA) was employed to simulate Lamb wave propagation and interaction with notches.
Experimental validation was conducted to verify the FEA results.

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A 2-D Fourier transform method was utilized for quantifying defect interactions.

Main Results:

Excellent agreement was achieved between FEA simulations and experimental results.
The sensitivity of Lamb waves to notches is influenced by frequency-thickness product, mode type/order, and notch geometry.
Lamb wave modes a(1), alpha(0), and s(0) showed varying sensitivities to defects.
Lamb waves can detect notches when the wavelength-to-notch depth ratio is approximately 40.
Transmission ratios across defects exhibit strong frequency dependence.

Conclusions:

Finite-element analysis and experimental methods effectively characterize Lamb wave interactions with defects.
A 2-D Fourier transform method provides a quantitative approach for defect assessment using Lamb waves.
Lamb wave NDT is feasible for notch detection under specific conditions, with sensitivity dictated by wave properties and defect characteristics.