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Acoustoelastic characterization of plates using zero group velocity Lamb modes.

Authors :
Morales, Rosa E.
Pathak, Niket
Lum, Jordan S.
Kube, Christopher M.
Murray, Todd W.
Stobbe, David M.
Source :
Applied Physics Letters. 2/19/2024, Vol. 124 Issue 8, p1-6. 6p.
Publication Year :
2024

Abstract

Acoustoelasticity, a characteristic of material anharmonicity, gives rise to a link between wave propagation velocity and the stress state in materials. Ultrasonic techniques to monitor this coupling, particularly with high sensitivity and in a noncontact manner, can have widespread application both in the quantification of applied and residual stress and in the characterization of nonlinear material behavior through measurement of higher order elastic constants. Here, we use a laser ultrasonic technique to excite and detect zero group velocity (ZGV) Lamb wave resonances in aluminum plates under uniaxial loading. A laser line source is used to excite these resonances at different orientations with respect to the applied load, and the signals are detected using an interferometer. The effects of stress and source orientation on ZGV resonance frequencies are validated using the theory of acoustoelastic Lamb wave propagation. In addition, a model-based inversion technique is used to extract Murnaghan's third-order elastic constants from measurements of the stress dependence of the first two ZGV modes generated parallel and perpendicular to the applied load. Laser generation and detection of ZGV resonances is shown to be an effective and powerful approach for the noncontact and nondestructive acoustoelastic characterization of elastic waveguides. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00036951
Volume :
124
Issue :
8
Database :
Academic Search Index
Journal :
Applied Physics Letters
Publication Type :
Academic Journal
Accession number :
175630466
Full Text :
https://doi.org/10.1063/5.0183620