title: Determination of the acoustoelastic coefficient for surface acoustic waves using dynamic acoustoelastography: an alternative to static strain.
abstract: The third-order elastic constants of a material are believed to be sensitive to residual stress, fatigue, and creep damage. The acoustoelastic coefficient is directly related to these third-order elastic constants. Several techniques have been developed to monitor the acoustoelastic coefficient using ultrasound. In this article, two techniques to impose stress on a sample are compared, one using the classical method of applying a static strain using a bending jig and the other applying a dynamic stress due to the presence of an acoustic wave. Results on aluminum samples are compared. Both techniques are found to produce similar values for the acoustoelastic coefficient. The dynamic strain technique however has the advantages that it can be applied to large, real world components, in situ, while ensuring the measurement takes place in the nondestructive, elastic regime.
authors.affiliation: Electrical Systems and Optics Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors.forename: R
authors.initials: R
authors.lastname: Ellwood
authors.affiliation: Electrical Systems and Optics Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors.forename: T
authors.initials: T
authors.lastname: Stratoudaki
authors.affiliation: Electrical Systems and Optics Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors.forename: S D
authors.initials: SD
authors.lastname: Sharples
authors.affiliation: Electrical Systems and Optics Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Clark
authors.affiliation: Electrical Systems and Optics Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors.forename: M G
authors.initials: MG
authors.lastname: Somekh
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D000535:Aluminum; D004548:Elasticity; D054459:Elasticity Imaging Techniques / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D008422:Materials Testing; D008962:Models, Theoretical; D009038:Motion; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014159:Transducers
chemical_list: D000535:Aluminum