Elastic wave velocities in metallic structures are affected by variations in environmental conditions such as changing temperature. This paper extends the theory of acoustoelasticity by allowing thermally induced strains in unconstrained isotropic media, and it experimentally examines the velocity variation of Lamb waves in aluminum plates (AL-6061) due to isothermal temperature deviations. This paper presents both thermally induced acoustoelastic constants and thermally varying effective Young's modulus and Poisson's ratio which include the third order elastic material constants. The experimental thermal sensitivity of the phase velocity () for both the symmetric and antisymmetric modes are bounded by two theories, the acoustoelastic Lamb wave theory with thermo-acoustoelastic tensors and the thermoelastic Lamb wave theory using an effective thermo-acoustoelastic moduli. This paper shows the theoretical thermally induced acoustoelastic Lamb wave thermal sensitivity () is an upper bound approximation of the experimental thermal changes, but the acoustoelastic Lamb wave theory is not valid for predicting the antisymmetric (A0) phase velocity at low frequency-thickness values, 1.55 MHz mm for various temperatures.
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November 2014
November 01 2014
Investigating the thermally induced acoustoelastic effect in isotropic media with Lamb waves
Jacob C. Dodson;
Jacob C. Dodson
a)
Air Force Research Laboratory
, Munitions Directorate, Fuzes Branch, Eglin Air Force Base, Florida 32542
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Daniel J. Inman
Daniel J. Inman
Aerospace Engineering Department,
University of Michigan
, Ann Arbor, Michigan 48109
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Acoust. Soc. Am. 136, 2532–2543 (2014)
Article history
Received:
December 30 2013
Accepted:
September 19 2014
Citation
Jacob C. Dodson, Daniel J. Inman; Investigating the thermally induced acoustoelastic effect in isotropic media with Lamb waves. J. Acoust. Soc. Am. 1 November 2014; 136 (5): 2532–2543. https://doi.org/10.1121/1.4897310
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