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Application of a cross correlation technique for assessment of a non-homogeneous stress field
(2016)
Many researchers have addressed the determination of a homogeneous stress field from the analysis of ultrasound waves, using the theory of acoustoelasticity with Murnaghan´s constants derived for axially loaded specimens with the ultrasound wave path also in the axial direction, or for hydrostatically loaded specimens. However, the use of such strategy for structural healthy monitoring requires the ability to handle nonhomogeneous, arbitrarily oriented stress fields. This paper describes an attempt to evaluate changes in the stress field of a concrete block with an eccentrically placed tendon through acoustoelastic analysis. Pairs of acoustic transducers are placed on the surfaces such that wave paths are parallel to the tendon. A cross correlation technique is used for the accurate assessment of the sound velocity changes, and subsequent application of Murnaghan´s equations for assessing the stress changes. Results are promising with respect to the evaluation for non-homogeneous stress field from ultra sound velocities.