Abstract
The main effect of stresses on the propagation of ultrasonic wave is the variation of its velocity. Generally, the relative change of wave velocity due to the stress is proportional to the latter and the proportional coefficient is known as the acoustoelastic coefficient. For most of ultrasonic methods, the knowledge of the value of these acoustoelastic coefficients is necessary to evaluate stress field. This paper is devoted to the evaluation of the error introduced by the use of acoustoelastic coefficients defined with the natural coordinates for the estimation of residual stresses. The differences between the acoustoelastic coefficients expressed with the natural and initial coordinates are theoretically and experimentally determined and compared. It is shown that the value of some coefficients can vary significantly according to the used system of coordinates and that the consequence on the estimation of residual stresses can be important.
Published Version
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