Acoustoelastic lamb wave propagation in a homogeneous, isotropic aluminum plate

Journal Article · Thu Jun 23 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3591852· OSTI ID:21511628

Gandhi, Navneet; Michaels, Jennifer E; Lee, Sang Jun ^[1]

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1. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0250 (United States)

The effect of stress on Lamb wave propagation is relevant to both nondestructive evaluation and structural health monitoring because of changes in received signals due to both the associated strain and the acoustoelastic effect. A homogeneous plate that is initially isotropic becomes anisotropic under uniaxial stress, and dispersion of propagating waves becomes directionally dependent. The problem is similar to Lamb wave propagation in an anisotropic plate, except the fourth order tensor in the resulting wave equation does not have the same symmetry as that for the unstressed anisotropic plate, and the constitutive equation relating incremental stress to incremental strain is more complicated. Here we consider the theory of acoustoelastic Lamb wave propagation and show how dispersion curves shift anisotropically for an aluminum plate under uniaxial tension. Theoretical predictions of changes in phase velocity as a function of propagation direction are compared to experimental results for a single wave mode.

• OSTI ID: 21511628
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1335; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ACOUSTIC TESTING
ALUMINIUM
ANISOTROPY
CHEMICAL ANALYSIS
DIFFERENTIAL EQUATIONS
DISPERSIONS
ELASTICITY
ELEMENTS
EQUATIONS
FORECASTING
LAMB SHIFT
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS
NONDESTRUCTIVE ANALYSIS
NONDESTRUCTIVE TESTING
PARTIAL DIFFERENTIAL EQUATIONS
PHASE VELOCITY
PLATES
SIMULATION
SPECTRAL SHIFT
STRAINS
STRESSES
SYMMETRY
TESTING
VELOCITY
WAVE EQUATIONS
WAVE PROPAGATION
WAVEGUIDES