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Acoustic resonance scattering from a multilayered cylindrical shell with imperfect bonding
M Rajabi1, Seyyed M Hasheminejad
1School of Mechanical Engineering, Sharif University of Technology, Azadi, Tehran, Iran. majid_rajabi_iust@yahoo.com
Ultrasonics
|July 10, 2009
Summary
This study analyzes sound wave scattering from imperfectly bonded multi-layered hollow cylinders. Bonding stiffness significantly impacts wave propagation resonances, offering a method to assess structural integrity.
Area of Science:
- Acoustics
- Materials Science
- Mechanical Engineering
Background:
- Wave function expansion is a key method for analyzing wave phenomena.
- Interlaminar bonding imperfections in layered structures can significantly alter their acoustic response.
- Understanding wave propagation in hollow cylinders is crucial for structural health monitoring.
Purpose of the Study:
- To investigate the three-dimensional acoustic scattering of a time-harmonic plane progressive sound field obliquely incident upon a multi-layered hollow cylinder with interlaminar bonding imperfections.
- To develop a theoretical model for analyzing the effects of bonding quality on acoustic resonance scattering.
- To assess the sensitivity of various wave propagation modes to bonding stiffness variations.
Main Methods:
- Utilized wave function expansion and an approximate laminate model with modal state equations.
- Employed the classical T-matrix solution technique for each layer.
- Incorporated a linear spring model for interlaminar adhesive bonding and interfacial transfer matrices.
- Applied acoustic resonance scattering theory (RST) to determine scattered fields and surface wave responses.
Main Results:
- Investigated the effect of interlayer imperfection on resonances in a bilaminate aluminum cylindrical shell.
- Identified impacts on symmetric/asymmetric Lamb waves, fluid-borne A-type waves, Rayleigh, and Whispering Gallery waves.
- Demonstrated that the sensitivity of resonance frequencies to stiffness coefficients serves as a measure of bonding strength in a five-layered shell.
Conclusions:
- The stiffness of adhesive interlayers critically influences acoustic resonance frequencies in multi-layered hollow cylinders.
- The developed model accurately predicts the influence of bonding imperfections on wave propagation modes.
- Sensitivity analysis of resonance frequencies provides a viable method for evaluating bonding strength in layered cylindrical structures.
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