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Blind inversion method using Lamb waves for the complete elastic property characterization of anisotropic plates
J Vishnuvardhan1, C V Krishnamurthy, Krishnan Balasubramaniam
1Department of Mechanical Engineering, Center for Nondestructive Evaluation, Indian Institute of Technology, Chennai, India.
The Journal of the Acoustical Society of America
|February 12, 2009
Summary
A new method accurately determines material properties of anisotropic plates using Lamb wave velocities. This technique aids in material characterization and structural health monitoring.
Area of Science:
- Materials Science
- Solid Mechanics
- Ultrasonics
Background:
- Anisotropic plates require precise characterization of elastic properties.
- Lamb waves offer a sensitive method for probing material behavior.
Purpose of the Study:
- To develop a novel blind inversion method for complete determination of elastic moduli, symmetries, and principal plane orientations of anisotropic plates.
- To validate the method using simulated and experimental data.
Main Methods:
- Utilized Lamb wave S(0) and A(0) mode velocities.
- Employed a genetic algorithm for elastic moduli reconstruction.
- Applied Cowin and Mehrabadi's method for symmetry and orientation evaluation.
- Validated using simulated data for various symmetries and experimental data on a graphite-epoxy composite.
Main Results:
- Successfully reconstructed elastic moduli, material symmetries, and principal plane orientations.
- Demonstrated the method's effectiveness on transversely isotropic, orthotropic, and monoclinic materials.
- Experimental validation confirmed the approach's practical applicability.
Conclusions:
- The proposed blind inversion method provides a complete characterization of anisotropic plates.
- This technique is valuable for material characterization and structural health monitoring applications.
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