Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43833
Title: Imaging textural variation in the acoustoelastic coefficient of aluminum using surface acoustic waves
Authors: Ellwood, R
Stratoudaki, T
Sharples, SD
Clark, M
Somekh, MG 
Issue Date: 2015
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2015, v. 138, no. 5, p. 2811-2819 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: Much interest has arisen in nonlinear acoustic techniques because of their reported sensitivity to variations in residual stress, fatigue life, and creep damage when compared to traditional linear ultrasonic techniques. However, there is also evidence that the nonlinear acoustic properties are also sensitive to material microstructure. As many industrially relevant materials have a polycrystalline structure, this could potentially complicate the monitoring of material processes when using nonlinear acoustics. Variations in the nonlinear acoustoelastic coefficient on the same length scale as the microstructure of a polycrystalline sample of aluminum are investigated in this paper. This is achieved by the development of a measurement protocol that allows imaging of the acoustoelastic response of a material across a samples surface at the same time as imaging the microstructure. The development, validation, and limitations of this technique are discussed. The nonlinear acoustic response is found to vary spatially by a large factor (>20) between different grains. A relationship is observed when the spatial variation of the acoustoelastic coefficient is compared to the variation in material microstructure.
URI: http://hdl.handle.net/10397/43833
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4934270
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